三管轮轮机英语新题

轮机英语真题45期甲类三管轮

轮机英语真题45期甲类三管轮轮机英语第45期1.These acid residues must be prevented from entering the crankcase otherwise the lube oil wouldbe _______A.contaminated B .emulsified C deteriorated D .o_idated2.The ratio of the brake horsepower to the indicated horsepower of a diesel engine is its _______A.thermal efficiencyB.mechanical efficiencyC.brake thermal efficiencyD.volumetric efficiency3.The cetane number of a diesel fuel oil medicates its _________A.viscosityB.acid contentC.heating valueD.ignition quality4.The greatest turbulence in a diesel engine cylinder is created by the ________A.shape of the bustion chamberB.fuel injection spray patternC.cylinder swept volumeD.degree of peration of the fuel oil droplets5.The projection on a shaft designed to change circular motion into up and down or back and foremotion is called ______A.wheelB.crankshaftC.running gearD.cam6.A clearly visible benefit of RT-fle_ engines is their________operation at all ship speeds.This isachieved by the superior bustion performance.A.shocklessB.smokelessC.no vibration D noiseless7.A main bearing consists of two shells which are secured by means of studs and______A.tie rodsB.through boltsC.lead wiresD.bearing caps8.pared to four-stroke/cycle engines, two-stroke/cycle diesel engines have the disadvantage of_________A.less even torqueB.higher cylinder head temperaturesC.fewer power strokes per revolutionD.greater weight/size requirements9.________controls the fuel oil temperature in order to provide oil at the correct viscosity forbustionA.The viscosity regulatorB.The temperature controllerC.The flow meterD.The pressure switch10.A lubricant often has to perform many duties in any situation, in addition to its fundamental job of__________A.resisting o_idizationB.reducing frictionC.promoting moving speedD.developing inertia11.Shaker, circulation, and spray are the three general methods usedin _______A.pre-injection fuel oil treatmentB.lube oil filtrationC.lube oil purificationD.piston cooling12.Which of the diesel engine ponents listed increases air density and helps to improve engineoperating efficiency?A.ImpellerB.Air bottleC.Air cooler D E_haust diffuser13.Each cylinder has one starting valve which is usually opened by air pressure and closed by__________.A.nuts and boltsB.new jointsC.spring forceD.sealing rings14.Which of the listed governor characteristics will greatly affect the load sharing relationshipbetween paralleled diesel generators?A.SensitivityB.PowerC.Speed droopD.pensation15.A pyrometer is an instrument monly used to measure_______.A.cylinder pressureB.flame intensityC.e_haust gas temperatureD.crankshaft a_ial alignment16.After starting a diesel engine, which of the listed operating conditions should be checked first?A.Air bo_ pressureB.Lube oil pressureC.E_haust temperaturesD.Raw water pressure17.A high temperature alarm or ______which will melt is used to guard against the e_plosion ofpressor air pipelines.A.a flame trapB.a relief valveC.a fusible plugD.a bursting cap18.Great care is dedicated to the removal of ______from the scavenge air.A.gravityB.viscosityC.densityD.humidity19.Lubrication for the main reduction gears used with diesel enginesis usually supplied by ____A.oil from the main engine sumpB.an independent lube oil systemC.the stern bearing head tankD.the stern bearing sump tank20.The ma_imum pressure developed by a waste heat boiler is determined by the main engine e_haust______.A.gas positionB.gas temperatureC.pressureD.timing21.The _____is fitted in pair one is the main valve the other the au_iliary or standby.A.main sB.au_iliary s valveC.feed check or control valveD.blow down valve22.Improper maintenance of the fuel oil burners in an automatically fired au_iliary boiler, couldresult in _______.A.increased fuel consumptionB.increased feed-water consumptionC.fuel pump failureD.bustion control system failure23.Burner ignition failure in an automatically fired au_iliary boiler would be caused by _____A.a burned out solenoid in the oil supply valveB.high temperature e_cess airC.incorrectly setting the hot-well dump valveD.an incorrectly positioned burner snubber (缓冲器) relay24.Waterside scale in a fire-tube boiler may cause ______.A.increased heat transferB.fireside erosionC.high demandD.overheated tubes25.Throttling in the ________line of a centrifugal pump involves the risk of the pump cavitation A.suctionB.e_haustC.pressureD.discharge26.Centrifugal pimp can be designed with a number of impellers _____ to attain a high final deliverypressure.A.at two ends of the same shaftB.opposite each otherC.parallelD.in series27.Before disconnecting a joint in a pipeline, you should _______.A.determine the size of the gasketB.hang a bucket under the jointC.have a first aid kit on handD.be sure no pressure e_ists in the line28.To thoroughly pump out the bilges using a horizontally mounted centrifugal pump, the _____A.pump must always be primedB.volute must impart a radial and rotary motion of the waterC.suction side connection must guide the liquid to the lantern ringsD.stuffing bo_ should not be allowed any water leakage29.Which of the listed conditions can lead to cavitation in a centrifugal pump?A.V apor pockets formed in the suction flow streamB.Rough casing volute surfacesC.Worn wearing ringsD.Heavy fluid in the flow stream30.Refrigerant entering the pressor of a refrigeration system should be in which of the follogconditions?A.Sub-cooled liquidB.Sub-cooled vaporC.Superheated vaporD.Liquid31.______is the circulation and refreshing of the air in a space without neccssarily a change of1temperature.A.RefrigerationB.Air conditioningC.V entilationD.Heating32.In a chilled water air conditioning unit using a reciprocating pressor, the refrigerating effectthe primary refrigerant can be increased by _____.A.increasing refrigerant pressure in the coilB.increasing chilled water flow through the coolerC.sub-cooling the refrigerant in the condenserD.superheating the refrigerant in the pressor33.If a plastic film insulation bees damaged in air conditioning system,______may form withinthe film.A.evaporationB.condensationC.liquefiesD.vaporization34.The resistance to the movement of the globule in oily water mi_ture depends on its size and the_________of the fluid.A.pressureB.velocityC.gravityD.viscosity35.Because the flow rate of supply water pump is too large, oily water separator does not work well.Which of the follog is not the reason.?A.the monitoring equipment is out of orderB.separating effect bees badC.separating effect bees bad and inner wall is contaminatedD.inner wall is contaminated36.Which of the follog would not be burnt in an incinerator on board.A.waste oilB.waste clothesC.oil ragsD.plastic garbage37.Concerning the incinerator’s operating, which of the follog is not correct?A.scavenging time should be more than 30 seconds before ignitingB.the oil temperature of waste oil tank is 80~100℃C.first igniting the incinerator with diesel oil, when the temperature of hearth is about 600℃D.the ash from incinerator can be dumped into sea no distance limitation38._____are used to digest the sewage to produce innocuous sludge in a biological sewage treatmentplant.A.anaerobic bacteriaB.aerobic bacteriaC.air bubblesD.disinfection chemicals39.A centrifuge arranged to separate two liquids is known as ______.A.an oily water separatorB.a purifierC.a centrifugal pressorD.a clarifier40.A centrifugal fuel oil purifier should be shut down if ______.A.more sealing water is neededB.the over cl needs tighteningC.the purifier has a bad vibration when startedD.water is discharged from overflow line41.If the bowl of a disk type centrifugal purifier when operated asa separator is not primed, the_____A.oil has a tendency to emulsify in the bowlB.purifier will act as a clarifier at the discharge ringC.oil will be lost through the water discharge portsD.oil solids will be deposited only at the intermediate disk42.In a two-stage flash-type evaporator, e_cess brine in the first stage automatically passes_____.A.directly to the second stage feed heaterB.directly overboard through the brine coolerC.into the second stage flash chamberD.into the second stage vapor condenser43.In which of the areas listed would you e_pect to find the highest salt concentration in a flash evaporator?A.Distiller air ejector cooling mediumB.Saltwater heater dischargeC.First-stage internal feed bo_D.Second-stage internal feed bo_44.Hydraulic control check valve can be used to ____in the marine hydraulic mechanism.A.control the back pressure of return oilB.lock the oil lines under some conditionsC.permit oil flow with reversed directionD.Second-stage internal feed bo_45.The delivery rate of a variable stroke a_ial piston hydraulic pump is controlled by varying theposition of the _______.A.slide blockB.tilting bo_C.pintleD.reaction ring46.The crane is usually mounted on a pedestal to offer adequate ________to the operator.A.timeB.spaceC.lengthD.visibility47.Which problems can occur if the brake band lining of a wildcat brake bees e_cessively worn?A.The driving engine will over-speed.B.The anchor will immediately dropC.The clutch will overheatD.The brake’s effectiveness will be reduced48._______with various arrangements of barrels are the usual mooring equipment used on boardships.A.CranesB.chesC.CapstansD.dlass49.Overheating of a hydraulic system may be a result of _______.A.changing pump discharge pressure in response to normal load variationsB.a high oil levelC.incorrect fluid viscosityD.continued slow re-circulation of the oilIn the design of hydraulic piping and equipment consideration is given to minimize turbulence inthe hydraulic fluid as this will cause _______.A.molecular fluid vibrationB.energy lossesC .wide pressure variations D.mechanical damage to control valves51.One factor that determines the frequency of an alternator is the ________.A.number of turns of wire in the armature coilB.number of magic polesC.strength of the mags usedD.output voltage52.What will be the phase angle relationship of a si_-pole, three-phase, rotating field generator?A.60B.120180D.36053.To parallel an ining machine to a running machine therefore it is necessary to ensure firstlythat ________.A.two frequencies must be brought into phaseB.the ining machine accepts a small amount of loadC.the running machine must be unloadD.both voltages are equal54.The frequency of an alternator is controlled from the main switchboard by adjusting the _______.A.frequency meterB.voltage regulatorC.governor controlD.sychroscope switch55.______is provided to alternators, in the event of prime mover failure to ensure that the alternatordoes not act as a motor.A.Reverse current protectionB.Reverse power protectionC.Synchronising deviceD.Frequency meter56._______is used to control, modulate, monitor and protect generator set.A.Control panelB.Load panelC.Paralleling panelD.Busbar57.Which of the listed sections of an emergency switchboard is used to supply power for alarmsignals under emergency conditions?A.The generator and bus transfer sectionB.The 450 volt, 60 cycle, 3 phase busC.The 120 volt, 3 phase, 60 cycle busD.The 24 volt DC bus58.The ground terminal of a starter should be connected to ________.A.the mon ground pointB.the starter’s frameC.the municatorD.the starter’s mounting bolts59.Which of the electrical properties listed will always be the same for each ponent in a parallelcircuit?2A.ImpedanceB.CurrentC.ResistanceD.V oltage60.In a series circuit, which value will remain unchanged at all places in the circuit?A.V oltageB.CurrentC.ResistanceD.Inductance61.In an alternating current electrical system, a low system power factor is a direct sign of _____A.wasted energyB.efficient operationC.a short in the e_citer field dingsD.an e_cessive number of minor system grounds62.Accidental grounds in a shipboard electrical system must be repaired as soon as possible as they will ________.A.result in immediate power outagesB.damage circuit breakersC.ear on the ground detection systemD.damage insulation and may cause outage63.If the main engine starting consecutively failed _______times, the cause should be found and the trouble eliminated before ne_t starting.A.2B.3C.4D.564.The normal color of the e_haust gas of the diesel should be _______.A.achromatism or thin grayB.thin whiteC.sky-blue D black65.After finished with engine, which of the follog cannot be shut off by the duty engineer?A.fuel valveB.the main starting valveC.the sea chestD.the main sea water pump inlet valve66.Before the seas get rough, it is a good safety practice to _______.A.secure loose gearB.move quickly about the shipC.increase lightingD.shutdown au_iliary equipment67.A class “C” fire would occur in ________.A.beddingB.pipe insulationC.painta generator68.The most likely place for a fire to start through the process of spontaneous bustion is in _________.A.an electrical switchboardB.the pressure tanksC.the fuel oil tanksD.the oily rag bin69.Which of the fire e_tinguishers listed is to be weighed annually and sent ashore for recharging if the weight loss e_ceeds 10‰of the weight of a full charge?A.FoamB.Soda acidC.Dry chemicalD.Carbon dio_ide70.Which of the follog ponents provides a direct source of seawater for the fire main system?Rose bo_B.Sea chestC.Sluice valveD.Fire pump stuffing bo_71.When administering artificial respiration, it is of the utmost importance to ________.A.use the mouth-to-mouth methodB.clear airwaysC.use rhythmic pressure methodD.check the injured person’s heartbeat72.Obviously, for a given fuel oil, its pour point is _______its cloud point.A.lower thanB.higher thanC.as same asbetter than73.____, where the ship is docked for hull coating renewal, and for any other required underwater work to be carried out, when the opportunity is taken to make other repairs.A.V oyage repairsB.Routine dockingC.Damage repairsD.conversion74.When the dock is refilled with water after docking repair, the first work which should be done by engineer department is ________.A.igniting au_iliary boilerB.releasing air in sea water systemC.starting generatorD.cut off shore power75.The correct tightening is obtained by the use of ______to measure the e_tension given to the bolts.pressure gaugesB.thermometersC.stretch gaugesD.bridge gauges76.In the Oil Record Book, a prehensive list of operational items are grouped into operational sections Each section is codified by a/an________A.numberB.abbreviationC.letterD.number, abbreviation and letter77.Under MARPOL Code the ship to which it lies has to carry_______.A.an International Ship Security CertificateB.an International Oil Pollution Prevention CertificateC.a Safety Management Certificatean International Ballast Water Management Certificate78.Which one is not the “clear grounds” for a more detailed inspection?A.the master and the chief engineer are unable to municate effectivelyB.serious corrosion on the hullC.damaged sanitary pumpD.one page missing in the oil record book79.“Insufficiency of manning or insufficiency of certification of seafarers” is an identification of a________A.substandard shipB.standard shipC.over-standard shipD.reference ship80.STCW 78/95 Convention shall ly to seafarers _____on board seagoing ship entitled to fly theflag of a Party.A.servedB.servingC.surveyedD.surveying81.The officer in charge of the engineering _______the watch to the relieving officer if there isreason to believe that the latter is obviously not capable of carrying out the watch-keeping duties effectively.A.shall take overB.shall not take overC.shall band overD.shall not hand over82.When the order given by bridge may have bad results, the duty engineer should_____A.inform the captain for a further considerationinform the captain, and not perform itC.s the M/E immediately, and then inform the chief engineerD.s the M/E immediately, and then inform the captain83.The scuppers should be plugged _____.A.only if fi_ed containment is not usedB.only if portable containment is not usedC.only if fi_ed containment drains are openD.whenever the vessel is being bunkered84.If it bees necessary to pump bilges while a vessel is in port, which of the follog proceduresshould be followed?A.Pump only if the discharge is led to a shore tank or bargeB.Pump only during the hours of darknessC.Pump only on the outgoing tideD.Pump only as much as is necessaryThe SOLAS convention prescribes that in the fire fighting drill the duty engineer should start thefire pump and supply deck water in _______minute(s)A.5B.3C.2D.186.Accordi ng to the IS M CODE, the “person” in the phrase “to designate a person or persons ashorehaving direct access to the highest level of management” refers to ________.A.the manager of the shipping panyB.the master of the shipC.the designated person on board shopD.the designated person ashore87.In order to strengthen maritime security and prevent and suppress acts of terrorism againstshipping, a new, prehensive security regime for international shipping was set to enter into force in July 20__4.The new regime is ________.A.ISM CodeB.ISPS CodeC.FSS CodeD.IBCC Code88.In the voyage, when carrying out abandon ship drill, ________should be test every time.A.the emergency lighting system for muster and abandon shipB.air/oil emergency shut-down3C.M.E.emergency operationD.main/au_iliary steering gear changing二．关联题（关联题干下有4个小题，每小题4个选项）第一组Scavenge port inspection provides useful information about the condition of cylinders, pistons, and rings, at low e_pense.The inspection consists of visually e_amining the piston, the rings and the lower part of the cylinder liner, directly through the scavenge air ports To reduce the risk of scavenge bo_ fire, remove any oil sludge and carbon deposits in the scavenge air bo_ and receiver in connection with the inspection.The port inspection should be carried out at the first s after a long voyage, e.g.by anchoring if possible, to obtain the most reliable result with regard to the effectiveness and sufficiency of the cylinder lubrication and the bustion cycle (plete or inplete)A misleading result may be obtained if the port inspection iscarried out after arrival at harbor, since manoeuing to the quay andlow-load running, e.g.river or canal passage, requires increased cylinder oil dosage, i.e.the cylinders are e_cessively lubricated, Further, during low load, the bustion ccle might not be as effective and plete as e_pected, due to the actual fuel oil qualities and service (running) condition of thefuel injection equipment.It is highly remended to take this information into consideration.89.The ponents of an engine involved in normal scavenge portinspection prise _______.①the piston②piston rings③the lower part of the cylinder liner④the fuel injectorA.①②B.①②③④C.②③D.①②③90.If the scavenge bo_ had too much oil sludge and carbon deposits, what would occur?A.e_cessive cylinder oil consumptionB.the scavenge bo_ fireC.the crankcase e_plosionD.e_cessive wear of the cylinder liner91.In order to obtain the most reliable result with regard to the effectiveness and sufficiency of the cylinder lubrication and the bustion cycle, when should the scavenge port inspection be carried out?A.at the first s after a long voyage, e.g.by anchoring if possibleB.at the first s after arrival at harborC.at the first s after low load runningD.at the first s after passing river or canal passage92.Under what condition that the scavenge pot inspection can gain a misleading result?①after passed through Panama Canal②after got alongside s hanghai quay③after arrival shanghai roadstead (外锚地)A.②③B.①②C.①②③ D①第二组Current regulations with respect to the discharge of oily water set limits of concentration 15 parts per million.A monitor is required to measure these values and provide both continuous records and an alarm where the permitted level is e_ceeded.The principle used is that of ultra-violet fluorescence.This is the emission of light by a molecule that has absorbed light.During the short interval between absorption and emission, energyis lost and light of a longer wavelength is emitted.Oil fluoresces more readily than water and this provides the means for its detection.A sle is drawn off from the overboard discharge and passes througha sle cell.An ultra-violet light is directed at the sle and the fluorescenceis monitored by a photoelectric cell Where an e_cessive level of contamination is detected an alarm is sounded and diverting valves are operated.The discharging liquid is then passed to a slop tank.93.The passage is mainly about ________.A.oily water separatorB.current regulations related to oil pollutionC.oil in water monitorD.the principle of ultra-violet fluorescence94.A monitor can obtain all of the follog functions e_cept _______.A.measuring oil content valuesB.providing continuous recordsC.lowering the oil content below 15 ppmD.providing an alarm unit warning of levels of discharge in e_cess of 15 ppm95.From the passage, we can learn that the ultra-violet fluorescence is a kind of________A.oil sleB.lightC.photoelectric cellD.alarm unit96.A sle is drawn off from ______and passes through a sle cellA.bilge waterB.discharge of oil separatorC.slop tankD.discharge of oily water separator 45轮机英语的答案1-5 ABDCD 6-10 ADBAB11-15 DCCCC 16-20 BCDBB21-25 CAADA 26-30 DDAAC31-35 CCBDA 36-40 DDBBC41-45 CCDBB 46-50 DDBCB51-55 BBDCB 56-60 ADBDB61-65 ADBAC 66-70 ADDDB71-75 DABDC 76-80 DBCAB81-88 DADA ADBA89-92 ~~~~ 93-96~~~~4。

轮机英语真题46期,甲类三管轮

轮机英语全国统考试题(总第46期)一、单项选择题1. In order to control thermal stresses,some types of modern engines use pistons with .A.heavy wall and intensive coolingB.heavy wall and no coolingC.thin wall and no coolingD.thin wall and intensive cooling2. The average pressure exerted on a piston during each power stroke is termed .A.indicated horsepowerB.mean eff ective pressureC.exhaust back pressurepression pressure.3.The ignition quality of a diesel f uel is indicated by theA.cetane numberB.volatility pointC.viscosity indexD.octane number4.A piston in a f our-stroke/cycle diesel engine makes f our strokes during eachA.crankshaf t revolutionB.mechanical cycle of operationC.period of two combustion cyclesD.cycle of two events5.Crankshaf ts of medium speed engines are f rom a single piece of steel.A.unusually solid weldedB.never be solid f orgedC.almost invariably solid f orgedD.almost invariably be welded6.The start ing air entering the cylinder begins when the piston .A.has nearly come to the TDCB.has just past the TDCC.has nearly come to the BDCD.has just past the BDC7.A main bearing consists of two shells which are secured by means of studs and .A.tie rodsB.through boltsC.lead wiresD.bearing capspared to f our-stroke/cycle engines,two-stroke/cycle diesel engines have the disadvantage of.A.less even torqueB.higher cylinder head temperaturesC.f ewer power strokes per revolutionD.greater weight/size requirements9. controls the f uel oil temperature in order to provide oil at the correct viscosity f or combustion.A.The viscosity regulatorB.The temperature controllerC.The f low meterD.The pressure switch10.In a diesel engine lube oil system,which of the f ollowing parts should be lubricated f irst?A.Camshaf t bearingsB.Main bearingsC.Piston crownsD.Cylinder walls11.A large,low-speed,main propulsion diesel engine uses sea water to directly cool theA.cylinder headsB.exhaust valvesC.scavenging airD.injectors12.In a turbocharger , inlet air velocity is increased in the .A.inlet nozzle ringB.stationary dif f user passagespressor outlet voluteD.rotating impeller vanes13.Each cylinder has one starting valve which is usually opened by air pressure and closed byA.nuts nad boltsB.new jointsC.spring f orceD.sealing rings14.In a simple mechanical governor, theA.centri f ugal f orce rotates the ball-headB.f lyweight centri f ugal f orce is balanced by spring f oceC. f lyweight centri f ugal f orce is balanced by hydraulic pressureD.speeder spring alone actuat es the f uel control rod15. A pyrometer is an instrument commonly used to measureA.cylinder pressureB.f lame intensityC.exhaust gas temperatureD.crankshaf t axial alignment16.Af ter starting a diesel engine,which of the listed operating conditions should be checked f i rst?A.Air box pressureB.Lube oil pressureC.Exhaust temperaturesD.Raw water pressure17.A high temperature alarm or which will melt is used to guard against the explosion of compressor air pipelines. A.a f lame trap B. a relief valveC.a f usible plugD.a bursting cap18. What preventative maintenance should be done frequently to diesel engine starting air receivers?A.Drain the accumulated moisture.B.Test the relief valves.C.Watch the temperature to prevent f luctuations in pressure.D.Clean the interior to remove oil and f oreign matter.19.In reducing engine speed to and eff i cient propeller speed by the use of reduction gears,A.speed and torque are both reducedB.speed is reduced and torque remains unchangedC.speed is reduced and torque is increasedD.speed is sometimes unchanged while torque is increased20.Which of the f ollowing statements concerning f ire-bube boilers is correct?bustion gases f low through the tubes.B.Flames impinge on the tubes.bustion occurs in the tubes.D.Water f lows through the tubes.21.The exhaust boilers are used to recover some of carried in the exhaust gas f rom the main engine .A .water B.oil C.heat D.steam22.The water level in a steaming auxiliary boiler will always .A.rise when the steam pressure is increasedB.remain constant as long as the f eed pump operatesC.f all when the steam pressure is decreasedD.vary as the steam demand changes23.When lighting of f an auxiliary boiler,which of the problems listed could cause the burners to sputter?A.Cold f uel oilB.Low f uel oil pressureC.Low atomizing steam pressureD.Water in the f uel oil24.If the f eed pump f or and auxiliary boiler f ails to deliver the f eed water to the boiler,the cause may beA.high steam pressure in the boilerB.abnormally high f eed-water temperatureC.abnormally high boiler water temperatureD.steam demand exceeding feed pump capacity25.Through a pump,the liquid is transferred from the suction to the discharge by the mechanical variation of the volume of a chamber or chambers.A.positive displacementB.ejectorC.centrif ugalD.air compressor26.Sealing lines provide sealing liquid f low to the stuf f ing box of a centri f ugal pumpA.to prevent seawater from passing out the stuff ing box when a high suction head is presentB.to cool the shaf tC.in place of mechanical sealsD.in place of lantern rings27.Which of the valves listed will be cycled from f ully open to f ully close when the handle is turned 90 degree?A. A rising stem gate valveB.A globe stop valveC.A check valveD. A butterf ly valve28.Centrif ugal pumps,used to handle hot liquids, must have a minimum f low through them under all operating conditions.This f low serves toA.prevent overheating and damage to pump rotating parts due to rubbingB.maintain the net positive suction head of the pumpC.maintain hydraulic dif ferential in the pump impeller passagesD.purge the pump of non-condensable vapors and gases29.If you heard a …crackling‟noise in a centrif u gal pump, the most probable cause of the problem would beA.insuff icient speedB.cavitationC.excess discharge pressureD.excessive net positive suction head30.In the process of,liquid changes into gas.A.evaporation Bf rostingC.condensingpressing31.The device used f or low-pressure control and high-pressure cutout on a compressor is called aA.cutoutB.pressure controllerC.controller switchD.cutout switch32.A purge recovery system is used in a central air conditioning or ref rigeration system toA.purge lube oil f rom the liquid refrigerantB.recover wat er purged f rom the systemC.separate f oul gases f rom the receiverD.purge non-condensabl e gases without losing refrigerant33.In an air conditioning system,low head pressure associat ed with a reciprocating compressor can be the result ofA.broken valve springsB.tight drive beltsC.high line voltageD.air in the system34.When discharging bilge water over board, which criteria must be observed?A.The requirement f or the oil content of bilge water discharged is under 15ppmB.No discharge in sensitive watersC.Any discharge in sensitive watersD.International, national or local requirements have to be observed35.The f ollowing measures can be used to improve oily water separator‟s separating effect exceptA.overhauling every two yearB.working at intervalsC.renewing f iltration materialD.properly heating36.Disposal of all kinds of garbage but listed as below is prohibited within Special Areas.minuted or ground papers, rags, glass, metal etcB.plasticsC.f ood waste comminuted or groundD.Incinerator ash37. When does auxiliary burner of incinerator put into operation?I.start incinerator when it is cold II. Little waste oil f or dealing with III. plenty of waste oil f or dealing with IV the water and impurity in sludge are too much V the temperature in incinerator is low VI dealing with little solid rubbishA.II+III+VB. I+II+III+IVC.I+IV+V+VID.I+II+III+VI38.Bacteria which live are said to be aerobic.A. in the presence of oxygenB.without oxygenC.in the presence of nutritionD.without nutrition39. When centri f uging heavy f uel oil, an important f actor to consider is(are) the .1)f low rate 2)viscosity of thef uel oilA. 1)B.2)C.both 1) and 2)D.Neither 1)nor 2) are correct40.To ensure lube oil purif ier working in normal condition, the interval between two sludge discharging should not exceed hours.A. 2B.4C.5 D641. can not cause oil f low f rom wat er outlet of sel f cleaning purif i er.A. Oil temperature too highB.Diameter of gravity disc too largeC. Oil temperature too lowD.High level tank out of water42. In the production of f reshwat er from seawater through a process of heating and cooling, the cooling phase of production is usually calledA.evaporation BdistillationC.dehydrationD.condensation43.Distilled water f rom an evaporator may be discharged into a potable water tankA. through a detachable hose connectionB.af ter passing through an activated charcoal f ilterC.af ter chemical analysis shows it is f it f or consumptionD.through a solenoid operated three-way valve44.What type of valve is used to direct the f low of hydraulic f luid?A.relief valveB.direction control valveC.stop valverD.pressure control valve45.Cargo hand ling unit is rated according to the to be lif ted.A. cargo craneB.jibC.saf e working loadD.oil pressure46. The crane is usually mounted on a pedestal to effer adequate to the operator. A.time B.spaceC.lengthD.visibility47.Proper internal lubrication of a hydraulic anchor windlass lef t idle f or extended penods can be accomplished by .A.perf orming a chech run on the unit at regular intervalsB.testing the hydraulic f luid f or proper PHC.checking the reservoir f or proper levelD.cleaning strainers at regular intervals48. are used f or hauling in or letting out the wires which f asten the ship to the shore.A.Cargo winchesB.Mooring winchesC.WindlassesD.Cargo hatches49. The major source of chemical contaminants in hydraulic f luid is .A.microscopic steel shavingsB.abrasive wasteC.anti-oxidant compoundsD.oxidation by-products50.If you install a new hydraulic hose in a hydraulic system, the hose must be long enough to allow f or contraction to prevent .A. f ailure of the hydraulic hoseB.excessive f low through the lineC.f riction in other areas of the hydraulic systemD.overheating of the hydraulic f luid51.A cirucit that has one wire in contact with the hull of the ship is aA.series circuitB.grounded circuitC.short circuitD.closed circuit52.The f requency of an alternator at a given r/min is determined by the .A.number of turns of wi re in the armature coilB.number of magnetic polesC.strength of the magnets usedD.output voltage53.The operation of paralleling two alternators requires the voltages to be and also in phase.A.zeroB.eliminatedC.diff erentD.equal54.The f requency of an AC generator is controlled by theA.rheostaternorC.exciterD.capacitor55.A motor enclosure which protects against falling liquids is classif ied asA.water-proofB.drip-proofC.spray-tightD.spray-proof56. are supplied with electricity by main switchboard directly.A.Suez Canal searchlight, air compressor and ai r conditioning compressorB.Air compressor, boiler blower and ref rigeration plantC. Boiler blower , Suez Canal searchlight and ref rigeration plantD.Suez Canal searchlight and boiler blower57. is not installed on the emergency switchboard.A. AmmeterB.V oltmeterC.WattmeterD.Synchroscope58.When two D.C.generators operate in parallel, they are protected against motorizing byA.blow out coilsernor relayC.under voltage tripsD.reverse current trips59.Moisture in a D.C. motor would causeA.short circuitB.speed upC.slow downD.hunting60.The part of a f use that melts and opens the circuit is made ofA.copper and antimonyB.steel and babbittC.aluminum or beryllium alloyD.zinc or an alloy of tin and lead61.The main purpose of an electric space heater installed in a large AC generator is toA.prevent the windings f rom becoming brittleB. prevent moisture f rom condensing in the windings during shutdownC. prevent acidic pitting of the slip ringsD. keep the lube oil warm f or quick starting62.Sparking at the brushes of a running motor could be an indication ofA.normal operationB.a dirty commutatorC.increased brush capacityD.water vapor absorption63. Prior to starting ,the purpose of turning over a main propulsion diesel engine with the cylinder test cocks open, is to \A. test the starting systemB. remove condensation from the cylindersC.check the compressionD.check f or proper lube oil pressure64. During the watch keeping at sea, should be logged or recorded in the engine log book.A.the running hours of the cooling water pumpB.chief engineer‟s orderC.the main parameters of main and auxiliary equipments.D.the position of the vessel65. During ship manoeuvering, when thd diesel is stopped, which of the f ollowing items is wrong?A.keep all systems running normallyB. main engine is available at any momentC.shut off the starting air bottle outlet valveD.pay attention to the changes of the system parameters66.Which of the listed conditions can be considered as the single greatest cause of accidents?A.SpeedB.Excessive knowledge or skillC.Human errorD.Excitement67.On a tank vessel, which of the f ol lowing substances would be burning in a class “B”f ire?A.OilB.WoodC. RagsD.Electrical wiring68.The most likely place f or a f ire to start through the process of spontaneous combustion is inA. an electrical switchboardB.the pressure tanksC.the f uel oil tanksD.the oily rag bin69.Which of the f ire extinguishers listed is to be weighed annually and sent ashore f or recharging if the weight loss exceeds 10% of the weight of a f ull charge?A.FoamB.Soda acidC.Dry chemicalD.Carbon dioxide70.While on watch in the engine room,you hear a continuous sounding of the general alarm.Which of the f ollowing actions should you take f irst?A. Secure the burners then proceed to your assigned boart station.B.Start the f ire pump and establish f low to the f ire main.C.Open the guardian valve and standby to maneuver.D.Open the master control valves on the f ixed CO2 system.71.If there were a f ire in the bunker tanks, you shouldA.close the ventB.pump out the tankC.activate the f ixed CO2 systemD.cut off the heating coils72.To avoid excessive surge pressure when bunkering , you shouldA.bunker at a normal rateB.check f or kinks in hoseC.close valves slowlyD.shut valves bef ore topping off73. ,where minor repairs are carri ed out with a ship in sevice,of ten during a stay in prot. This may be remote from a ship repair site.A.V oyage repairsB.Routine dockingC.Daage repairsD.Conversion74. When is the dock survey carried out ?A.During annual repairually during dock repairC.Bef ore sea trialD.Af ter 5 years f rom last annual survey75.In the initial survey, compiles the survey report and f ills in certif icat e.A.surveyorB.chief engineerC.administratorpany superintendent 76.If an incorrect entry were made in the Oil Record Book, you shouldA.erase the entry and rewrite itB.notif y the ship‟s off icer-in-chargepletely black it out and make the correct entry alongsideD.draw a single line through the wrong entry and initial it.77.The International Oil Pollution Prevention Certif icate is valid f or a period ofA.one year f rom the date of issueB.f ive years from the date of issueC.three years f rom the date of issueD.f our years f rom the date of issue78. Which one is Not the …clear grounds‟f or a more detailed inspection?A. no operation procedures f or the oil separatorsB.engine log book missingC.the master and the chief engineer are unabl e to communicate effectivelyD.absence of an up-date muster list79. The Port State Control off icer may witness a f ire drill carried out by the crew assigned to these duties on theA.Navigation Log BookB.Engine Room Log BookC.Oil Record BookD.Muster List80.STCW 78/95 Convention shall apply to seaf arers on board seagoing ships entitled to f ly the f lag of a Party.A. servedB.servingC.surveyedD.surveying81.The main purpose of port State control is not toA.prevent an unsaf e ship proceeding to seaB.prevent a ship threatening the marine environmentC.f ine the shipsD.conf irm a saf e sailing82.The bridge should inf orm the engine room bef ore passing through congested or shallow waterway.A.24 hoursB.2 hoursC.1 hourD.15 minutes83.When the chief engineer is in the machinery spaces,the officer in charge of the engineering watch shallA.continue to be responsible f or machinery space operations despite the presence of the C/EB. hand over the responsibility to the chief engineer activelyC. be responsible f or the watching together with the chief engineer.D.assistant the chief engineer to contol the machinery.84.According to the international regulations concerning the prevention of pollution of sea areas f rom ships, the disposal into the sea of all plastics isA.welcomeB.admitted in some special sea areasC.prohibitedD.acceptable85.The ship emergency plan item does not include usually.I lif esaving, f ire f ighting II f irst aid III abandon shipA. IIB.IIIC.II IIID.I86. Under ISM Code, the ship to which it applies has to carryA. an International Ship Security Certif icat eB. an International Oil Pollution Prevention Cerif icatC.a Saf ety Managem ent Certif icateD. an International Ballast Water Management Certif icate87. The objective of ISPS Code isA. to protect the marine environmentB. to provide a method to avoid an accidentC. to protect the ship f rom collisionD. to keep terrorism action away f rom ships.88. According to “MARI TIME LABOUR CONVENTION,2006”,The maximum hours of work shall not exceedA.14 hours in any 24-hour periodB. 72 hours in any seven-day periodC.10 hours in any 24-hour periodD.88 hours in any seven-day period二、关联题（关联题题干下有4个小题，每小题4个选项）第一组Port State Control(PSC) is the inspection of f oreign ships in national ports f or the purpose of veri f ying that the condition of the ship and its equipment comply with the requirements of international conventions and that the ship is manned and operated in compliance with applicable international laws.The primary responsibility f or ensuring that a ship maintains a standard at least equivalent to that secif ied in internaitonal conventions rests with the f lag State and if all f lag States perf ormed their duties satisf actorily there would be no need f or port State control. Unf ortunately this is not the case as evidenced by the many marine accidents around the world-hence the need f or additional control.The authority f or exercising PSC is the national law based on relevant conventions. It is theref ore necessary f or a port State to be Party to those conventions and to have promulgated the necessary legislation bef ore exercising PSC. In accordance with the provisions of the applicable conventions,Parties may conduct inspections of f oreign ships in their ports Port State Control Off icers(PSCOs).89.The purpose of PSC is1) to check and inspect f oreign ships 2) to verif y the condition of a ship in compliance with requirements o f international conventions;3)to make sure that the ship is manned and operated well 4)to detain shipsA 1)2) B.2)3) C.1)3) D.123490.Who will be responsible f or ensuring that a ship maintains a standard at least equivalent to that specif i ed in international conventions?A.PSCOsB.Ship ownersC.Flag statesD.Port states91.Bef ore exercising PSC,a port state shouldA.become a contracting Party and promulgate regulations f or implementing PSCB.inf orm ship ownersC.establish proceduresD.inf orm shipping companies92. PSC inspection is implemented by throughA. f lag states/PSCOsB.f lag states/ship ownersC.port states/PSCOsD.port states/ship owners第二组Almost all f ailures in the f uel oil system,including the compression being to low,result in the crankshaf t rotating more slowly if there is a f ailure at one or more cylinders simultaneously. If only one or two cylinders fail, and the engine is not f ully loaded, the crankshaf t rev/min does not decrease, the reason being that the governor ensures that the remaining cylinders are loaded to a correspondingly great er extent. If the engine is already f ully loaded, the cylinders that are working normally become overloaded causing a smoking exhaust and higher exhaust temperatures etc. The load must always be reduced until the f ailure has been located and recti f ied. The reasons f or a cylinder suddenly working at reduced load, or failing completely, may be :1. a def ective or blocked f uel injection valve.2.the f uel oi l pump piston seizing in the barrel. This f ailure can be ascertained by trying to move the pump‟s toothed rack.Defective f uel pumps must be changed.3.the compression being to low because of sticking , worn or broken piston rings.4 leaking inlet or exhaust valves5. no clearance in the valve operation gear.The reasons f or the crankshaf t rotating more slowly, or stopping completely,can also be:1. the f uel oil f ilter being blocked. This f ailure is identif ied by decreasing oil pressure af t er the f uel oil f ilter.2.valve sticking in the open position3.leaking f uel oil pipes or joints.4.water in the f uel oil5.the regulating mechanism being jammed6.the governor not f uncitoning correctly.7the electrical shutdown valve(the monitoring system)being activated.93.This passage is mainly aboutA.the f ailure of reduced rpm.B.the f ailure of the governorC.how to ensure the constant rotational speedD.the reasons f or the f uel system to shut down94.If one or two cylinders fail in f uel oil system the crankshaf t rev/min .1)will invaviably decrease 2)does not decrease 3)will decrease under certain circumstancesA.1B.2C.3D.None of 1 2 3is true95. Which of the f ollowing is NOT mentioned as the reason f or a cylinder suddenly working at reduced load?A.f uel valve f ailureB.f ailure of f uel pump discharge valvesC.too large gaps of piston ringsD.the f uel oil f ilter being blocked completely96.Which of the f ollowing is NO T mentioned as the reason f or the crankshaf t rotating more slowly or stopping?A.changing f rom heavy oil to light diesel oilB.connections leakingC.there being too much waterD.malf unction of the governor 46轮机英语的答案1- 5 DBABC 6-10 BDBAB11-15 CDCBC 16-20 BCACA 21-25 CDDBA 26-30 BDABA 31-35 BDADA 36-40 BCACB 41-45 DDDBC 46-50 DABDA 51-55 BBDBA 56-60 DDDAD 61-65 BBBCC 66-70 CADDB 71-74 ACABA 76-80 DBADB 81-87 CCAC ACD 88-AB 89-92 ~~~~ 93-96~~~~。

问答05 轮机英语口语三管轮考证试题

Chapter 51. In which cases must bunkering be stopped?In case of fire, oil spill and bad weather.2. What prepartions are required on deck prior to(在…之前) the bunkering operation?Block the scuppers, prepare the anti-pollution material and fire fighting equipment, and so on.3. Describe a procedure for the commencement（开始）of pumping oil.Check the bunkering v/v, confirm the contacting signals with the oil barge, first slowly filling in the oil, then speed up.4. What should you do before bunkering?Make bunkering plan Make sure the bunkering speed, the emergency signals and brand of the oil.5. What measures against oil pollution should be taken before bunkering?同26. What do the terms TAN and TBN for lube oil stand for? TAN stands for total acid number, and TBN stands for total base number.7. When handling oil, what is an important consideration inorder to ensure safety?Fire prevention.8. What sort of documentation is involved with bunkering ? Oil Record Book, engine room log bo ok.,Bunkering plan, oil receipt,bunkering notice, and so on9. What should you do during bunkering ?Sound tanks from time to time, check pumping rate and keep watching for leakage , and so on.10. How do you take samples during bunkering?Open the oil valve and let the oil drop into the oil bottles.11. Why are communications important during bunkering . Because good communication can help us prevent oil spillage12 Describe how you would determine the volume of fuel loaded during the bundering operation.Sound the oil tanks, measure the oil temperature, and calculate the bunking quantity according to the tank table.13. What should you do after bunkering?Confirm the bunking quatity, disconnect the oil pipe, take oil samples make records in the log book.14. What are usually contained in a repair list?Name of the items to be repaired, position and the requiement,Ship’s main characteristics parameter and so on.15. Name some commonly used repairing methods.Weld, grind, machine, polish and so on16. Who will be responsible for the damage of the repaired parts if they occur within a few days after the repair? Shipyard.17. What power will be supplied after docking?Shore power18. What kind of work do we usually do for docking repair? The repairing work below the water line.19. During the docking repair,who usually supply fresh water?shipyard20.Who is in charge of the safety code agreement for the docking repair?shipyard21.What kinds of cargo should be discharged from the vessel while proceeding docking repair?All kinds of cargo should be discharged22.When reassembling propeller,who must supervise the working course on the spot?The chief engineer,the surveyor and the chief officer.23. When you want to build a new ship,it must comply with some rules.what are they?Rules for the constructiou of sea-going steel ships,solas,marpol ,and so on,24.Why is a survey necessary for a ship?To the safety of the ship, the crew, and property25.When and where did you have the PSC inspection.Last month in singapore26. Who should be present when a boiler survey is carried out?The chief engineer and surveyor27. Suppose you ship has been insured, what will you do first to claim for the insurance if the engine is damaged?The chief engineer make out a report about the damage and the captain give a sea protest.海事报告书28.Whom do you usually invite to come on board to ascertain and verify the extent of damage of machines or equipment.A surveyor from CCS29. A ship’s survery may be divided into three basictypes.what are they?Statutory survey法定检验, classification survey入级检验, notarial survey公证鉴定30. What does general survey usually include?Annual survey, periodical survey, damage survey, Temporary survey and so on31. How do you bargain?The price is too high. Can you give me some discount?32. What will you say if the price offered is higher than you expected?同3133. If you want to order stores and spare parts, whom will you turn to?Ship chandler34. What will you take into consideration if you want to get some stores and spare parts aboard?Delivery time, place, and quantity35. If you order some stores form the shipchandler,what should be generally listed out on the order list.Name , specification, and quantity36. How do you usually pay for the stores and spare parts? Inform the ship owner to pay by the account.37. Who will check the stores and spare pares delivered on board ship?The second engineer.38. What should be paid attention to when bunkering fuel oil?Fire prevention, and pollution prevention。

轮机英语三管轮试题空调

1530. Keep compartment_____ as the gas given off can be dangerous.A. well ventilatedB. well cleanC. in good orderD. more room 1531. The cooler as the liquid becomes, _____.A. the faster it will evaporateB. the slower it will condenseC. the slower it will evaporateD. the faster it will flow1532. The heat used to change a liquid to a vapor is called_____.A. latent heat of fusionB. latent heat of vaporizationC. specific heat of vaporizationD. latent heat of the gas1533. The temperature _____ a liquid changes its state from liquid to gas depends upon the liquid itself and upon the pressure _____ it is subjected in the containing vessel.A. at which/to whichB. from which/at whichC. to which/from whichD. in which/on which1534. Air conditioning is the process of treating air to control _____ its temperature, humidity, cleanliness and distribution to meet the comfort requirements of the occupants of the conditioned space.A. instantaneousB. instantaneouslyC. simultaneousD. simultaneously 1535. One of the functions of ventilation is to_____ the humidity of spaces containing sources of moisture, or to_____ the temperature of spaces not mechanically cooled such as the engine room.A. increase/reduceB. reduce/increaseC. increase/increaseD. reduce/reduce1536. _____ is the control of temperature and humidity in a space together with the circulation, filtering and refreshing of the air.A. RefrigerationB. Air conditioningC. VentilationD. Heating1537. _____ is the circulation and refreshing of the air in a space without necessarily a change of temperature.A. RefrigerationB. Air conditioningC. VentilationD. Heating1538. _____ is used for sensing the temperature of the room in the air condition system.A. An expansion valveB. An evaporatorC. A thermostatD. A condenser 1539. Water evaporates or steam condenses at the saturation temperature, which depends upon the pressure, the higher the pressure _____ the saturation temperature.A. the moreB. the higherC. the lowerD. the highest1540. The shutter of the evaporator was blocked with_____, it means there was too much evaporation.A. iceB. wooden boardC. iron plateD. cotton waste 1541. The quantity of cooled air delivered by an air conditioning unit should_____the sum of the quantity of air re-circulated to the unit and the quantity mechanically exhausted.A. balanceB. not balanceC. be more thanD. be less than 1542. In the process of_____, liquid changes into gas.A. evaporationB. frostingC. condensingD. compressing 1543. In extreme weather conditions, either hot or cold, control of the air conditioning plant presents_____ difficulties.A. fewB. littleC. a littleD. less1544. Most air conditioning units have_____ for adjusting the ratio of recirculated fresh air. Care must be taken not to reduce the fresh air so that stuffiness or smells arise.A. catch platesB. dampersC. regulating valvesD. fans1545. For the intermediate condition, thermostats must be correctly set _____.A. by trial and errorB. by and largeC. automaticallyD. very easily 1546. The process of removing moisture from air is known as _____.A. humidificationB. dehumidificationC. vaporizationD. evaporation 1547. If air at 95o C dry bulb temperature and 50% relative humidity is conditioned to 75o C dry bulb temperature and 50% relative humidity, it is an example of _____.A. cooling onlyB. cooling and humidifyingC. cooling and dehumidifyingD. adiabatic cooling1548. Increasing the moisture content of conditioned air is known as_____.A. moisturizingB. dehumidificationC. dampeningD. humidification 1549. The sum of the sensible heat and the latent heat of any substance is known as_____.A. total heatB. residual heatC. specific heatD. superheat1550. The heat identified by only a change in temperature is known as_____.A. sensible heatB. latent heatC. total heatD. residual heat1551. In reference to air conditioning, when air attains the maximum amount of moisture it can hold at a specific temperature, it is said to be_____.A. superheatedB. saturatedC. condensedD. convected1552. Which of the following factors will have the greatest effect on the heating load within a conditioned space?A. Solar gain.B. Infiltration and ventilation air.C. Occupants inside the space.D. Entertainment equipment within the space. 1553. The dew point of air is reached when the wet bulb temperature is_____.A. Twice the dry bulb temperatureB. 10o C above the dry bulb temperatureC. 5o C above the dry bulb temperatureD. Equal to the dry bulb temperature 1554. The temperature at which water vapor in the atmosphere begins to condense iscalled the_____.A. dew point temperatureB. condensation temperatureC. psychometric temperatureD. absolute humidity temperature1555. The heat required to change a substance from a solid to a liquid while at its freezingtemperature, is known as the latent heat of _____.A. fusionB. vaporizationC. condensationD. sublimation1556. The heat required to change a substance from a liquid to a gas without experiencing a temperature change is defined as the latent heat of _____.A. fusionB. vaporizationC. sublimationD. condensation1557. The amount of moisture in a given sample of air, when compared with the amount of moisture the air could hold if totally saturated at the existing temperature of the sample, is called _____.A. absolute humidityB. specific humidityC. effective humidityD. relative humidity1558. The ratio of the weight of moisture contained in a given volume of air, to the weight of moisture that the same sample would hold if saturated, is called the_______.A. absolute humidityB. relative humidityC. specific humidityD. total humidity1559. The sensible heat of air is dependent upon the _____.A. dry bulb temperatureB. wet bulb temperatureC. saturation temperatureD. water vapor superheat1560. Sludge may form in the crankcase of an air conditioning compressor as a result of _____.A. bubbling refrigerantB. overheating and oxidationC. lowered operating temperaturesD. reducing the cloud or flash point 1561. Due to the large amount of heat picked up by the air in boiler and engine rooms, it would be _____ to maintain ambient conditions within the comfort zone by air conditioning .A. possibleB. necessaryC. practicableD. impracticable 1562. The process of adding moisture to air to increase the relative humidity is known as ________.A. sublimationB. humidificationC. desiccationD. moisturization1563. The main distribution duct in an air conditioning system which contains the cooling coils and filters is called the ____________.A. manifoldB. condenserC. chamberD. plenum1564. The humidity of the atmosphere can be determined by the use of the ______________.A. anemometerB. ManometerC. potentiometerD. psychrometer1565. Which of the following functions is not one of the functions of air conditioner?A. refreshing the airB. making person upsetC. adjusting the air humidityD. adjusting the air temperature1566. When comparing the air with 50%of relative humidity with air with 100% of relative humidity, which one will hold more water?A the formerB the latterC not for sureD same each other1567. For the proper control of the air temperature in an air conditioning using chilled water circulation, which of the listed conditions should remain constant regardless of load changes?A. Chilled water system supply temperatureB. Chilled water system return temperatureC. Compressor discharge temperatureD. Compressor suction pressure1568. The ___only allows for adjustment of temperature in each room by the occupant manually controlling the air volume admitted.A. central air conditioning systemB. high velocity systemC. low velocity systemD. single duct system1569. With ducted air conditioning systems, the modern tendency is to use ___A. central air conditioning systemB. high velocity systemC. low velocity systemD. single duct system1570. Which one is not the component of a typical marine pattern self-contained unit?A. a water cooler condenserB. a direct expansion coolerC. a hermetic compressorD. a centrifugal pump1571. ____ is used in typical marine pattern self-contained unit.A. a water cooler condenserB. a slop tankC. a expansion tankD. a centrifugal pump1572. Under normal conditions, the quantity of air circulation becomes less and less. What is the reason?A. dirty delivery ductsB. too much refrigerantC. the fouling filtersD. high temperature outside1573. Under tropical conditions, control valves have fully opened, but the room still hot. What measures can be taken in such a case.A. Keep the plant running all timeB. Stare another blowerC. Increase the ratio circulated to fresh airD. Reduce the seawater flow to the condenser1574. If a film insulation becomes damaged in air conditioning system, ___ may from within the film.A. evaporationB. condensationC. liquefiesD. vaporization 1575. The humidifier’s valve of air-conditioner should be ___, when the temperature is 5~8℃ in the winter.A. decreasedB. increasedC. fixedD. closed1576.The humidifier’s valve of air-conditioner should be _____, when the temperature is lower than 0o C.A. decreasedB. increasedC. fixedD. closed1577. The air-conditioner is running in the winter and to be stopped, we should _____.A. close Fan and Humidifier at the same time.B. firstly close Fan and then close humidifier immediately.C. firstly close humidifier and then close Fan immediately.D. firstly close humidifier and then close Fan after 30 seconds.1578. When starting air-conditioner in the winter, we should open ____ in sequence.I. valve of warming Ⅱ. valve of humidifier Ⅲ. FanA. Ⅲ、Ⅱ、ⅠB. Ⅲ、Ⅰ、ⅡC. Ⅰ、Ⅲ、ⅡD.Ⅱ、Ⅲ、Ⅰ1579. When air is at its dew point it is at its __________.A. lowest absolute humidityB. lowest relative humidityC. highest absolute humidityD. highest relative humidity1580. Which of the fluids listed is normally used to condense the primary refrigerant in a shipboard central air conditioning system?A. air or nitrogenB. seawater or fresh waterC. sodium nitrate brineD. calcium sulfate brine1581. A re-heater, as used in an air conditioning system, is designed to control the ___________.A. chilled water temperatureB. dew point temperatureC. primary air temperatureD. dry bulb temperature1582. To prevent the unnecessary loading of an air conditioning system while maintaining the designed dry bulb temperature and relative humidity in an air conditioning system, you should ___________.A. admit only enough fresh outside air to provide proper ventilationB. reduce the air reheating system loadC. lower the compressor heat pressureD. operate the purge recovery unit continuously1583. A lower thermostatic temperature setting will provide a desired degree of comfort in a room where ______________.A. low relative humidity is maintainedB. triple banded squirrel cage fans are usedC. air circulation is a maximumD. high relative humidity is maintained1584. In an air conditioning system, moisture is removed from the air by ___________.A. filtersB. separatorsC. ducted trapsD. dehumidifiers1585. Routine maintenance on a Central Control Room hermetically sealed air conditioning unit should include ________.A. changing the air filterB. recharging the systemC. changing compressor lubricantD. renewing container vacuum1586. In order to achieve greater dehumidification with an air conditioning system, you should __________.Ⅰreduce the cooling coil; Ⅱtemperature increase the re-heater temperatureA.ⅠonlyB.ⅡonlyC. bothⅠandⅡD. neitherⅠnorⅡ1587. Which of the processes listed would be the most satisfactory method to use to lower the humidity of the air being circulated by an air conditioning system?A. Cooling the air to a temperature just above dew point.B. Heating the air to a point at which moisture will boil off, then re-cooling it.C. Cooling the air to a point below dew point, then re-cooling it.D. Heating the air and then cooling it to a point below dew point.1588. Which of the following methods is normally used to control the temperature of air distributed from individual cooling coils in an air conditioning system using a chilled water circulation system?A. A room thermostat activates an electric heater at each individual chilled air outlet when necessary.B. Varying the number of passes the air makes across the coils.C. Varying the temperature of the water through the coils.D. Varying the quantity of water flowing through the coils.1589. Sludge may from in the lubricating oil crankcase of a reciprocating air conditioning compressor as a result of ________.A. wax precipitation in the lube oilB. contamination by dust, scale, or moistureC. refrigerant bubbles in the lube oilD. refrigerant reducing the lube oil viscosity1590. The compressor in an air-cooled condensing refrigeration system is short cycling on the high pressure cutout switch, ___A. system is overcharged with refrigerantB. system is low on refrigerantC. discharge valves are leaking excessivelyD. discharge valves are leaking slightly.。

轮机英语口语测试模拟卷参考答案(三管轮A)

轮机英语口语测试模拟卷参考答案（三管轮A）Section A 朗读Watchkeeping is the fundamental responsibility of seafarers. It can be grouped into navigational watchkeeping and watchkeeping in port.The members of the engine department except the chief engineer are divided into three shifts during the voyage. Each shift will keep watch for four hours. One is during the daytime and the other is at night, that is 8 hours altogether in a 24-hourday. Every shift has an engineer in charge. The others who are not on duty will study, take part in repair and maintenance of the machinery, or have a rest.The duty engineer should be responsible for what happens during the watch. If there is anything beyond his command, the duty engineer must report it to the chief engineer and fill in various records in time. When he hands over the watch, he must tell the details about everything that happened during his watch and sign the record.When the ship stays in the port, only some crew take part in the watchkeeping. The main task is to manage generators to ensure electrical supply and supply of oils, water, steam and gases for daily use.Section B 口述Briefly State the Type of Marine Pumps and Their Uses(参考答案)The are mainly three types of pumps on board, the displacement pump, the centrifugal pump, and the ejector pump. The displacement pump has the reciprocating pump and the rotary pump, the former being the general feed pump, the fire pump, the bilge pump, the sanitary pump, the ballast pump and so on, the latter being the gear pump, the vane pump and screw pump which are used for delivering the liquid with small capacity and high pressure. The centrifugal pump has volute pump and diffuser pump, which are use to deliver the liquid except very small capacity or very low speed. The ejector pump is simple in construction, and its efficiency is comparatively low, and also used widely on board.Section C 回答问题7.What are the three departments on an ocean going vessel?8.How many people are three in your family and what are they?9.When do you keep watch in the engine room when the ship is at sea?10.What well-known ports in the world have you been to?11.What could you say when you ask for help?12.Where did you graduate?1。

轮机英语三管轮英语试题制冷

Lesson 13 制冷1288. The inner part of the condenser should be cleaned with_____.A. gas oilB. diesel oilC. chemical compoundD. Freon-12 1289. The evaporating pressure in R22 vapor compression refrigeration plant should be _____atmospheric.A. belowB. aboveC. equal toD. much larger than1290. Hot gas defrosting uses the hot gas from _____ to defrost the evaporator.A. starting air bottlesB. diesel enginesC. boilersD. refrigeration compressors1291. In a refrigeration plant the _____ need defrosting.A. fanB. compressorC. condenserD. evaporator1292. What is the substance called which can readily be converted from a liquid into a vapor, and also from a vapor into liquid with a reasonably narrow range of pressure?A. RefrigeratorB. RefrigerantC. Cooling mediumD. Brine 1293. A fluid coil will _____ large quantifies of heat when it changes state from a liquid to a vapor.A. releaseB. absorbC. developD. regenerate1294. A fluid coil will _____ large quantifies of heat when it changes state from a vapor to a liquid.A. releaseB. absorbC. developD. regenerate1295. The latent heat of evaporation is dissipated in the _____ in a compression refrigeration system.A. evaporatorB. condenserC. expansion valveD. compressor 1296. A refrigerant boils and vaporizes in the _____ in a compression refrigeration system.A. liquid receiverB. compressorC. condenserD. cooling coil 1297. A refrigerant gives up heat when it goes through _____.A. condenserB. regurgitateC. evaporatorD. boil coil1298. It should be ensured that only _____ vapor is handled by the refrigeration compressor.A. humidityB. dryC. steamD. oill299. In the refrigeration compressor the temperature of the vapor is _____ by compression.A. raisedB. risenC. reducedD. maintained constant1300. If the capacity of the refrigeration compressor is too small, the excess vapor will accumulate in the evaporator, causing the pressure to _____.A.riseB. fallC. be maintained constantD. None of the above is true.1301. If the capacity of the refrigeration compressor is too large, the saturation temperature will_____.A. riseB. fallC. be maintained constantD. None of the above. 1302. In the process of_____, liquid changes into gas.A. evaporationB. frostingC. condensingD. compressing1303. Since heat will not flow freely from a body at a_____ temperature to another at a_____ temperature, it is necessary to expend mechanical work, heat, or electrical energy from an external source to achieve refrigeration.A. lower/higherB. shallower/deeperC. larger/smallerD. higher/lower1304. In a compression refrigeration plant the refrigerant flows from the expansion valve and through the_____ where it absorbs heat from the space being cooled and becomes a gas or vapor.A. compressorB. condenserC. throttle valveD. evaporator1305. The_____ compressor and its electrical motor are entirely housed in a gas-tight casing.A. open-typeB. hermeticC. A and BD. None of the above. 1306. Both the temperature and the pressure of the refrigerant are increased in the _____.A. compressorB. condenserC. evaporatorD. expansion valve 1307. The compressor suction line conveys the refrigerant vapor from_____to_____.A. condenser/evaporatorB. evaporator/compressorC. compressor/condenserD. None of the above.1308. The thermal expansion valve controls the amount of refrigerant that is allowed to flow to the_____.A. compressorB. cooling coilsC. condenserD. receiver1309. When the temperature of the refrigerant flowing out from the condenser is below the condensing temperature, it is said to be_____.A. dryB. wetC. super-cooledD. superheated1340. During working, thermostatic expansion valve should be_____.A. either all the way open or all the way closedB. normally fully openC. throttled depending on loadD. controlled by liquefied pressure1341. The expansion valve on a Freon system controls the_____.A. superheat of the gas leaving the compressorB. back pressure in the evaporatorC. temperature of the iceboxD. superheat of the gas leaving the evaporator1342. A feeler or thermal bulb is used for the expansion valve to_____.A. detect the temperatureB. detect the pressureC. heat the refrigerantD. accelerate the refrigerant1343. In a compression refrigeration plant the refrigerant is under low pressure in the_____ and under high pressure in the_____.A. compressor/condenserB. condenser/evaporatorC. throttle valve/evaporatorD. evaporator/condenser1344. The boiling and condensation points of refrigerant mainly depend onthe_____ exerted upon it.A. temperatureB. densityC. volumeD. pressure1345. The function of_____ in a refrigeration plant using Freon is to move moisture from all refrigeration system.A. filterB. filter drierC. heat exchangerD. air cooler1346. The saturation temperature of the refrigerant must be_____ that required in the evaporator refrigerated space.A. aboveB. belowC. equal toD. None of the above. 1347. After passing through the expansion valve the refrigerant should be in the state of_____.A. vaporB. liquidC. solidD. None of the above is tree.1348. The refrigerant flows through the evaporator, where it_____ heat from the refrigerated space.A. extractsB. releasesC. gives noD. absorbs no1349. In practice, the refrigerant flow after the evaporator is designed to ensure that the vapor leaving the evaporator is slightly_____.A. saturatedB. super-cooledC. wetD. superheated1350. Which of the following will be desirable properties of refrigerant?(1)non-explosive; (2)non-corrosive; (3)that it doesn't react with lubricantsA. (1), (2) and (3)B. (1) and (2)C. (1) and (3)D. (2) and (3) 1351. In the _____ refrigeration compressor one end of the crank shaft extends through the crankcase house for connection, via a coupling or pulley, to an external drive motor.A. open-typeB. hermeticC. semi-hermeticD. all the above 1352. In a compression refrigeration plant the hot, high pressure refrigerant gas is cooled by the sea water and becomes liquid in the_____.A. compressorB. condenserC. throttle valveD. evaporator1353. What is the function of thermostatic expansion valve in a compression Refrigeration system?A. nonexistentB. for controlling pressureC. for controlling superheatD. for controlling the solenoid valve1354. In a vapor compression refrigeration the evaporating pressure is maintained constant by the action of the_____, which removes vapor from the evaporator at the same rate at which it is formed.A. evaporatorB. compressorC. condenserD. none of the above 1355. The device used for low-pressure control and high-pressure cutout on a compressor is called_____.A. cutoutB. controller switchC. pressure controllerD. cutout switch1356. Which of the following may cause that the compressor cuts off on high Pressure cutout in a refrigeration plant? (1) faulty condensing; (2) too few refrigerant; (3) high discharge pressure;A. any of (1) and (3)B. any of (1) and (2)C. any of (2) and (3)D. any of (1), (2) and (3)1357. Which of the following may cause that excessively warm water leaves the condenser in a refrigeration plant? (1) too little cooling water; (2) too much cooling water; (3) too warm cooler water.A. (1) onlyB. any of (1), (2) and (3)C. any of (1) and (3)D. any of (1) and (2)1358. The presence of air in the condenser of a refrigeration system will_____ the condensing pressure.A. increaseB. reduceC. maintain constantD. None of the above is true.1359. Which of the following best describes "overcharge of refrigerant"?A. Too much refrigerant.B. Too little refrigerant.C. Refrigerant is ran out.D. Running is over.1360. What separate the high pressure side from the low pressure side in a refrigeration system?A. Condenser and thermal expansion valve.B. King and solenoid valves.C. Compressor and thermal expansion valve.D. Condenser and solenoid valve.1361. Moisture should be kept out of an R-12 system because it tends to cause_____.A. icing of the automatic controlsB. embitterment of some parts of the automatic controlsC. sludge in the lubricating oilD. all of the above1362. Air that may enter a refrigeration plant tends to collect in the_____.A. upper part of the receiverB. upper part of the condenserC. down stream end of the cooling coilD. outlet end of the condenser 1363. Insufficient refrigerant in a refrigeration plant may result in_____.A. high discharge pressureB. frosting of the crankcaseC. high temperature of the overboard waterD. low suction pressure of compressor1364. Which will cause the high pressure cutout to stop the compressor in aR-22 system?A. Condenser leakageB. A shortage of liquid refrigerantC. Excessive frost on the evaporatorD. Not enough condenser cooling water1365. A ruptured diaphragm in a thermostatic expansion valve will cause the valve to_____.A. openB. closeC. remain in its positionD. flood the evaporator with refrigerant1366. If liquid refrigerant accidentally comes in contact with the eyes, _____ immediately.A. rub the eyesB. irritate the eyesC. wash the eyes with a heavy boric acid solutionD. obtain medical help 1367. Should a person be overcome due to lack of oxygen and high concentration of refrigerant, treat with_____.A. fresh waterB. fresh airC. salt waterD. artificial respiration 1368. Excessively warm water leaving condenser may be caused byA. fouled tubes in shell and tube condenserB. too little or too warm condenser waterC. air or non-condensable gas in systemD. overcharge of refrigerant1369. The inner part of the condenser should be cleaned with_____.A. gas oilB. diesel oilC. chemical compoundD. Freon-12 1370. Freon 12 which is used to produce intense cold is normally a______ when at atmospheric pressure and temperature.A. liquidB. gasC. solidD. water only1371. As the refrigerant passes through the valve orifice, its pressure is reduced and part of the refrigerant turns into_____.A. liquidB. oily mixtureC. emulsionD. vapor1372. Because the expansion valve is just______ way open, the refrigerant is under low pressure in the evaporator.A. littleB. fewC. a littleD. a few1373. The refrigerating agent can_____ at low temperature in the evaporator. A. expand B. evaporate C. condense D. distil1374. Faulty operation of any system is indicated by very definite_____.A. symptomsB. samplesC. tracesD. tracks1375. The boiling and condensation points of a refrigerant depend on the_____ exerted upon it.A. temperatureB. pressureC. velocityD. heat1376. In the condenser, the hot, high pressure refrigerant gas is cooled by the sea water and becomes_____.A. fresh waterB. vaporC. mixtureD. liquid1377. Thermostatic expansion valve are_____.A. either all the way open or all the way closedB. normally openC. throttled depending on loadD. controlled by suction pressure1378. Which of the following may cause that excessively warm water leaves the condenser in a refrigeration plant? (1) too little cooling water; (2) too much cooling water; (3) too warm cooling water.A. (1) onlyB. any of (1), (2) and (3)C. either (1) or (3)D. either (1) or (2)1379. If a refrigeration compressor is running continuously without lowering temperature as normal in the refrigerator, the trouble may be_____.A. excessive condenser cooling waterB. warm food in the refrigeratorC. a shortage of refrigerantD. s shortage of compressor oil 1380. The color of the flame on a halide torch without any refrigerant presentis_____.A. blueB. greenC. orangeD. purple1381. A thermostatic expansion valve is properly controlling evaporator superheat. Adjusting this valve to lower the superheat will result in a/an_____.A. evaporator pressure decreaseB. evaporator coil over-feedC. evaporator capacity increaseD. expansion valve diaphragm rupture1382. When you adjust a thermostatic expansion valve, _____.A. refrigerant must be bled off the sensing line before adjustments are madeB. all refrigerant must be pumped into the receiver before adjustments are madeC. time must be allowed for conditions to stabilize in the evaporator before further adjustments are madeD. all refrigerant must be routed through the dehydrator while changing the superheat setting1383. The refrigeration system low pressure cutout switch is actuated by_____.A. an electric system managerB. a sensing bulb at the tail coil of the evaporatorC. pressure changes in the suction lineD. failure of the king solenoid valve1384. The sensing line for the low pressure cutout switch to a refrigeration system is located_____.A. in the chill boxB. before the receiverC. on the suction side of the compressorD. on the discharge side of the compressor1385. The purpose of the low pressure cut-out switch is to_____.A. maintain liquid refrigerant at the suction of the compressorB. maintain a preset suction pressure to the compressorC. start and stop the compressor at preset operating pressuresD. operate at minimum efficiency1386. Short cycling of a refrigeration compressor refers to_____.A. frequently grounding outB. frequently starting and stoppingC. running too fastD. running too slow1387. On all vessels equipped with refrigeration units of over 20 cubic foot capacity, _____.A. a gas mask suitable for protection against each refrigerant used, or a self contained breathing apparatus must be providedB. it is the sole responsibility of the chief engineer to ascertain that all members of the engineering department are familiar with the use of gas masks or breathing apparatusC. spare charges shall be carried for at least 50% of each size and variety of gas masks and/or self contained breathing apparatusD. all of the above 1388. The heat gained per pound of refrigerant in the evaporator is known as the_____.A. latent heat of vaporizationB. sensible heatC. refrigerating effectD. specific heat of vaporization1389. When liquid reaches the compressor of a refrigeration system through the suction line, the condition is called_____.A. flooding backB. superheatingC. overflowingD. recycling 1390. Which of the following terms represents the form of heat removed from the refrigerant in the condenser of a refrigeration system?A. Latent heat of vaporization.B. Heat of compression.C. Superheat.D. All of the above.1391. The FIRST thing to do to ensure that a refrigeration unit will not start while undergoing repairs, is to_____.A. secure and tag the electrical circuitB. place a crow bar in the flywheel of the unitC. inform all persons in the area not to start the unitD. make a log book entry1392. In a refrigeration system, the refrigerant absorbs the latent heat of vaporization in the____.A. compressorB. condenserC. receiverD. evaporator1393. The only means of removing the latent heat of condensation from a refrigerant in the normal refrigeration cycle is by_____.A. passing it through the expansion valveB. condensing refrigerant in the system condenserC. passing the gaseous refrigerant through the heat interchanger on the suction side of the compressorD. maintaining a high pressure on the system's receiver1394. Personnel working with refrigeration systems, and subject to the exposure Of refrigerants should wear_____.A. face shieldB. a respiratorC. rubber glovesD. an all purpose gas mask1395. For safe storage, the maximum allowable temperature to which refrigerant bottles should be exposed is_____.A. 100o CB. 125o CC. 150o CD. 175o CC. Discharge headD. Total head1396. When subjected to high heat from a open flame, or an electric heating element, which of the listed refrigerants will break down and produce phosgene gas?A. CO2B. Methyl chlorideC. R-22D. Sulphur dioxide1397. When the relief valve opens it discharges high pressure refrigerant vaporto the_____.A. liquid strainerB. refrigerant inlet of the condenserC. inlet side of the evaporatorD. suction side of the compressor1398. A refrigeration system contaminated with moisture can be affectedby_____.A. acid formationB. sludge formationC. ice in the expansion valveD. All of the above1399. Some chloronated flourocarbon refrigerants may decompose into a toxic irritating gas if it is _____.A. stored at temperatures below 60 degrees FahrenheitB. charged into a system having copper fittingsC. allowed to mix with compressor oilD. exposed to an open flame or hot surface1400. Which of the listed operations will cause an automatically controlled refrigeration compressor to restart?A. Closing of the solenoid valveB. Closing of the expansion valveC. An increase in the suction pressureD. Decreasing the suction pressure 1401. Saltwater is typically provided to a refrigeration system to_____.A. cool the expansion valveB. prevent refrigerant superheatingC. condense the refrigerant gasD. prevent motor overheating1402. Moisture is removed from a refrigeration system by_____.A. bleeding refrigerant from the condenserB. opening a drain petcock on the oil separatorC. condensing the water in the heat exchangerD. using a dehydrator cartridge1403. Moisture in the refrigerant may_____.A. freeze on the expansion valve seat and reduce the flow of liquid refrigerantB. emulsify the oil in the condenserC. freeze in the king valveD. clog the oil trap1404. Moisture in a refrigeration system can cause_____.A. freezing the expansion valve closedB. corrosion of system pipingC. improper temperature regulationD. all of the above1405. Which of the problems listed could be indicated if a sight glass in the refrigerant liquid line is full of bubbles?A. Proper refrigerant charge.B. Faulty expansion valve.C. Insufficient refrigerant.D. Solenoid valve stuck open.1406. A liquid indicator sight glass is useful in determining whether or not a Refrigeration system is sufficiently charged. It is generally located in the_____.A. high pressure liquid lineB. low pressure liquid lineC. high pressure vapor lineD. low pressure vapor line1407. If a liquid sight flow indicator in a refrigeration system shows gas bubbles in motion passing inside of the glass, there is_____.A. too much refrigerant in the systemB. oil entrained in the refrigerantC. less than a full charge of refrigerant in the systemD. ice crystals forming in the refrigerant1408. A sight glass is installed in the liquid line to indicate the condition of the refrigerant charge and may also indicate the_____.A. condition of the expansion valveB. moisture in the systemC. condition of the compressor suction valvesD. condenser temperature 1409. A liquid sight flow indicator in a refrigeration system is examined and gas Bubbles are noted in motion with the fluid flow. This means_____.A. the system is fully chargedB. there is air leaking in from the condenserC. ice crystals are forming in the refrigerantD. the system contains less than a full charge of refrigerant1410. If the refrigeration compressor crankcase is sweating, the cause may be due to_____.A. a shortage of refrigerantB. the compressor running continuouslyC. liquid refrigerant returning to the compressorD. the compressor short cycling on the high pressure cutout1411. A refrigeration system compressor crankcase is sweating or unusually cold. This is an indication of_____.A. a shortage of refrigerant in the systemB. air in the systemC. an accumulation of liquid refrigerant in the crankcase.D. a shortage of oil in the crankcase1412. Refrigeration system compressor crankcase sweating is an indicationof_____.A. insufficient lube oil circulating through the systemB. excessive circulation of lube oil through the systemC. insufficient refrigerant in the systemD. an overworked compressor 1413. Sweating of the refrigeration system compressor crankcase is causedby_____.A. too much superheatB. insufficient superheatC. suction pressure too lowD. excessive refrigerant returning to the compressor1414. Crankcase sweating in a refrigeration system is caused by_____.A. a stuck solenoid valveB. a shortage of refrigerantC. too much oil in circulationD. too much superheat1415. If a refrigeration system compressor crankcase is sweating, youshould_____.A. add refrigerant to the systemB. adjust the thermal expansion valve to the proper settingC. adjust the float valve to the proper holding pressureD. open the hand expansion valve1416. When it is necessary to open a refrigeration system for repairs and the system will be open for more than a few minutes, the open ends of the system should be_____.A. dehydratedB. purgedC. pluggedD. evacuated1417. A cracked diaphragm in a thermostatic expansion valve will cause the valve to_____.A. return to a neutral positionB. flood the evaporatorC. openD. close1418. Which of the problems listed represents the major difficulty encountered with thermal expansion valve operation?A. Lube oil passing through the system.B. Moisture or foreign matter collecting at the valve seat and orifice.C. Variable spring tension caused by the changing temperature.D. Frost on the liquid line.1419 If a refrigeration compressor were short cycling on the low pressure cutout switch, the probable cause for this might be the______.A. system was overcharged with refrigerantB. high pressure switch was improperly adjustedC. expansion valve strainers were fouledD. suction valves were leaking slightly1420. If a refrigeration crankcase compressor were short cycling on the low pressure cutout switch, the cause might be that the_____.A. system was overcharged with refrigerantB. system was low on refrigerantC. suction valves were leaking slightlyD. relief valve was leaking slightly1421. A refrigeration unit will tend to short cycle when operating _____.A under heavy loadsB during hot gas defrostC under light loadsD during starting conditions1422. If a refrigeration compressor is short cycling on high head pressure, you should_____.A. purge the condenser if the waterside is dirtyB. check for proper water flow through the condenserC. increase the high pressure cutout settingD. reduce the cooling water flow1423. The refrigeration compressor in a water cooled refrigeration system is short cycling on the high pressure cutout switch. One reason for this could be the_____.A. system is low on refrigerantB. high pressure cutout switch is improperly adjustedC. discharge valves are leaking slightlyD. discharge valves are leaking excessively1424. If a refrigeration compressor will not start, the reason may be_____.A. the pressure regulating valve is not closingB. an excessive lack of refrigerant in the systemC. badly leaking discharge valvesD. worn piston rings1425. When a refrigeration compressor motor fails to start, the FIRST thing that should be checked for is a_____.A. loose expansion valve control bulbB. low differential setting on the H.P. cutoutC. blown fuse in the motor circuitD. faulty suction pressure regulator1426. If a large difference exists between the compressor discharge pressure and The pressure corresponding to the existing condensing temperature in a refrigeration system, you should _____.A. increase the flow of the cooling water through the condenserB. adjust the high pressure cutout to maintain the desired pressureC. open the hot gas bypass temporarily to reduce capacityD. purge non-condensable gases to reduce the excess pressure1427. The accumulation of air and other non-condensable gases in a refrigeration system will _____.A. cause a loss of the liquid sealB. create a vapor lock in the liquid receiverC. collect in the condenserD. cause foaming of the oil in the crankcase1428. Air entering an air-cooled refrigeration system is indicated by_____.A. frosting of the liquid lineB. higher than normal head pressureC. a clear sight glassD. abnormally cold reefer boxes1429. The presence of bubbles in a refrigeration system liquid line may_____.A. promote refrigerant dehydrationB. be absorbed in the receiverC. cause low condensing pressureD. carry moisture and lead to corrosion1430 Which of the listed statements is a characteristic of the liquid charged power element used with thermostatic expansion valves?A. At the designed operating temperature, the liquid refrigerant charge has changed to a vapor.B. The liquid refrigerant tends to collect at the bellows or diaphragm and reduces the valve sensitivity.C. The sensing bulb is empty of liquid refrigerant charge at the designed operating temperature.D. The sensing bulb is never emptied of liquid refrigerant under normal operating conditions.1431. Excessive circulation of the lubricating oil with the refrigerant in a refrigeration system will cause_____.A. carbon deposits on the compressor suction valvesB. the evaporator temperature to increaseC. rapid corrosion of the thermal expansion valveD. no operating problems 1432. Which of the listed characteristics can be applied to R- 12 vapor?A. It is corrosive.B. It is odorless.C. It is visible as h blue fog.D. It has a distinctive taste.1433. Foaming of the oil in a refrigeration compressor crankcase is causedby_____.A. refrigerant boiling out of solution from the lube oilB. liquid refrigerant flooding the compressor and systemC. lube oil viscosity being reduced by refrigerant dilutionD. compressor suction pressure suddenly increasing1434. In a refrigeration system, foaming of the crankcase oil may causethe_____.A. expansion valve to overfeedB. compressor to knockC. water regulating valve to failD. crankcase drains to plug1435. Excessive oil foaming in the crankcase of a refrigeration compressor canresult in _____.A. overheated compressor bearingsB. excess lube oil viscosityC. carbon deposits on the compressor piston ringsD. wax crystals forming in the lubricant1436. Which of the following statements is correct concerning a typical shipboard multi-coil refrigeration system?A. The liquid receiver functions to collect and remove non-condensable gases.B. A thermostatic expansion valve is used to control refrigerated space temperature.C. Refrigerant temperature in an evaporator is directly related to refrigerant pressure.D. Dehydrators must be used continuously in a refrigeration system.1437. The sudden reduction of pressure occurring within the crankcase of a refrigeration compressor during starting causes the_____.A. sudden evaporation of wax crystals in the lubricantB. sudden evaporation of entrapped air in the lubricantC. release of refrigerant from the oil/refrigerant mixtureD. release of dissolved lubricant from the refrigerant1438. Refrigerant is normally sub-cooled in a refrigeration or air conditioning system condenser to_____.A. maintain adequate coil back pressureB. prohibit flashing in the liquid lineC. reduce refrigerant volume in the systemD. reduce compressor discharge line loading1439. The principal purpose of sub-cooling liquid refrigerant prior to its entering the expansion valve is to_____.A. increase the refrigerating effect, by decreasing the amount of flash gasB. allow the refrigerant to enter the throttling device in a saturated conditionC. increase the refrigerating effect by increasing the amount of flash gasD. minimize the temperature drop of the liquid as it passes through the solenoid valve to the outlet side1440. Sub-cooling is a method of reducing the temperature of the liquid refrigerant below its _____.A. freezing pointB. floc pointC. condensing temperatureD. compression temperature1441. Under normal conditions, the refrigerant enters the compressor in an Operating refrigeration system as a_____.。

三管轮考试48期轮机英语试卷及答案

三管轮考试48期轮机英语试卷及答案轮机英语第45期1.These acid residues must be prevented from entering the crankcase otherwise the lube oilwould be _______A. contaminated B .emulsified C deteriorated D .oxidated2. The ratio of the brake horsepower to the indicated horsepower of a diesel engine is its_______A. thermal efficiencyB. mechanical efficiencyC. brake thermal efficiencyD. volumetric efficiency3. The cetane number of a diesel fuel oil medicates its _________A. viscosityB. acid contentC. heating value4. The greatest turbulence in a diesel engine cylinder is created by the ________A. shape of the combustion chamberB. fuel injection spray patternC. cylinder swept volumeD. degree of penetration of the fuel oil droplets5. The projection on a shaft designed to change circular motion into up and down or back andfore motion is called ______A. wheelB. crankshaftC. running gear6. A clearly visible benefit of RT-flex engines is their ________operation at all ship speeds.Thisis achieved by the superior combustion performance.A. shocklessB. smokelessC. no vibration D noiseless7. A main bearing consists of two shells which are secured by means of studs and______A. tie rodsB. through boltsC. lead wiresD. bearing caps8. Compared to four-stroke/cycle engines, two-stroke/cycle diesel engines have the disadvantageof _________A. less even torqueB. higher cylinder head temperaturesC. fewer power strokes per revolutionD. greater weight/size requirements9. ________controls the fuel oil temperature in order to provide oil at the correct viscosity forcombustionA. The viscosity regulatorB. The temperature controllerC. The flow meterD. The pressure switch10. A lubricant often has to perform many duties in any situation,in addition to its fundamentaljob of __________A. resisting oxidizationB. reducing frictionC. promoting moving speedD. developing inertia11. Shaker, circulation, and spray are the three general methods used in _______A. pre-injection fuel oil treatmentB. lube oil filtrationC. lube oil purificationD. piston cooling12. Which of the diesel engine components listed increases air density and helps to improveengine operating efficiency?A. ImpellerB. Air bottleC. Air cooler D Exhaust diffuser13. Each cylinder has one starting valve which is usually opened by air pressure and closed by__________.A. nuts and boltsB. new jointsC. spring forceD. sealing rings14. Which of the listed governor characteristics will greatly affect the load sharing relationshipbetween paralleled diesel generators?A. SensitivityB. PowerC. Speed droopD. Compensation15. A pyrometer is an instrument commonly used to measure_______.A. cylinder pressureB. flame intensityC. exhaust gas temperatureD. crankshaft axial alignment16. After starting a diesel engine, which of the listed operating conditions should be checked first?A. Air box pressureB. Lube oil pressureC. Exhaust temperaturesD. Raw water pressure17. A high temperature alarm or ______ which will melt is used to guard against the explosion ofcompressor air pipelines.A. a flame trapB. a relief valveC. a fusible plugD. a bursting cap18. Great care is dedicated to the removal of ______from the scavenge air.A. gravityB. viscosityC. densityD. humidity19. Lubrication for the main reduction gears used with dieselengines is usually supplied by ____A. oil from the main engine sumpB. an independent lube oil systemC. the stern bearing head tankD. the stern bearing sump tank20. The maximum pressure developed by a waste heat boiler is determined by the main engineexhaust ______.A. gas compositionB. gas temperatureC. pressureD. timing21. The _____ is fitted in pair one is the main valve the other the auxiliary or standby.A. main steam stopB. auxiliary steam stop valveC. feed check or control valveD. blow down valve22. Improper maintenance of the fuel oil burners in an automatically fired auxiliary boiler, couldresult in _______.A. increased fuel consumptionB. increased feed-water consumptionC. fuel pump failureD. combustion control system failure23. Burner ignition failure in an automatically fired auxiliary boiler would be caused by _____A. a burned out solenoid in the oil supply valveB. high temperature excess airC. incorrectly setting the hot-well dump valveD. an incorrectly positioned burner snubber (缓冲器) relay24. Waterside scale in a fire-tube boiler may cause ______.A. increased heat transferB. fireside erosionC. high steam demandD. overheated tubes25. Throttling in the ________ line of a centrifugal pump involves the risk of the pump cavitationA. suctionB. exhaustC. pressureD. discharge26. Centrifugal pimp can be designed with a number of impellers _____ to attain a high finaldelivery pressure.A. at two ends of the same shaftB. opposite each otherC. parallelD. in series27. Before disconnecting a joint in a pipeline, you should _______.A. determine the size of the gasketB. hang a bucket under the jointC. have a first aid kit on handD. be sure no pressure exists in the line28. To thoroughly pump out the bilges using a horizontally mounted centrifugal pump, the _____A. pump must always be primedB. volute must impart a radial and rotary motion of the waterC. suction side connection must guide the liquid to the lantern ringsD. stuffing box should not be allowed any water leakage29. Which of the listed conditions can lead to cavitation in a centrifugal pump?A. Vapor pockets formed in the suction flow streamB. Rough casing volute surfacesC. Worn wearing ringsD. Heavy fluid in the flow stream30. Refrigerant entering the compressor of a refrigeration system should be in which of thefollowing conditions?A. Sub-cooled liquidB. Sub-cooled vaporC. Superheated vaporD. Liquid31. ______ is the circulation and refreshing of the air in a space without neccssarily a change oftemperature.A. RefrigerationB. Air conditioningC. VentilationD. Heating32. In a chilled water air conditioning unit using a reciprocating compressor, the refrigeratingeffect the primary refrigerant can be increased by _____.A. increasing refrigerant pressure in the coilB. increasing chilled water flow through the coolerC. sub-cooling the refrigerant in the condenserD. superheating the refrigerant in the compressor33. If a plastic film insulation becomes damaged in air conditioning system,______ may formwithin the film.A. evaporationB. condensationC. liquefiesD. vaporization34. The resistance to the movement of the globule in oily water mixture depends on its size andthe _________ of the fluid.A. pressureB. velocityC. gravityD. viscosity35. Because the flow rate of supply water pump is too large, oily water separator does not workwell. Which of the following is not the reason.?A. the monitoring equipment is out of orde rB. separating effect becomes badC. separating effect becomes bad and inner wall is contaminatedD. inner wall is contaminated36. Which of the following would not be burnt in an incinerator on board.A. waste oilB. waste clothesC. oil ragsD. plastic garbage37. Concerning the incinerator’s operating, which of the followingis not correct?A. scavenging time should be more than 30 seconds before ignitingB. the oil temp erature of waste oil tank is 80~100℃C. first igniting the incinerator with diesel oil, when the temperature of hearth is about 600℃D. the ash from incinerator can be dumped into sea no distance limitation38. _____ are used to digest the sewage to produce innocuous sludge in a biological sewagetreatment plant.A. anaerobic bacteriaB. aerobic bacteriaC. air bubblesD. disinfection chemicals39. A centrifuge arranged to separate two liquids is known as ______.A. an oily water separatorB. a purifierC. a centrifugal compressorD. a clarifier40. A centrifugal fuel oil purifier should be shut down if ______.A. more sealing water is neededB. the over clamp needs tighteningC. the purifier has a bad vibration when startedD. water is discharged from overflow line41.If the bowl of a disk type centrifugal purifier when operated asa separator is not primed, the_____A. oil has a tendency to emulsify in the bowlB. purifier will act as a clarifier at the discharge ringC. oil will be lost through the water discharge portsD. oil solids will be deposited only at the intermediate top disk42. In a two-stage flash-type evaporator, excess brine in the first stage automatically passes_____.A. directly to the second stage feed heaterB. directly overboard through the brine coolerC. into the second stage flash chamberD. into the second stage vapor condenser43. In which of the areas listed would you expect to find the highest salt concentration in a flash evaporator?A. Distiller air ejector cooling mediumB. Saltwater heater dischargeC. First-stage internal feed boxD. Second-stage internal feed box44. Hydraulic control check valve can be used to ____ in the marine hydraulic mechanism.A. control the back pressure of return oilB. lock the oil lines under some conditionsC. permit oil flow with reversed directionD. Second-stage internal feed box45. The delivery rate of a variable stroke axial piston hydraulic pump is controlled by varying the position of the _______.A. slide blockB. tilting boxC. pintleD. reaction ring46. The crane is usually mounted on a pedestal to offer adequate ________ to the operator.A. timeB. spaceC. lengthD. visibility47. Which problems can occur if the brake band lining of a wildcat brake becomes excessively worn?A. The driving engine will over-speed.B. The anchor will immediately dropC. The clutch will overheatD. The brake’s effectiveness will be reduced48. _______ with various arrangements of barrels are the usual mooring equipment used on board ships.A. CranesB. WinchesC. CapstansD. Windlass49. Overheating of a hydraulic system may be a result of _______.A. changing pump discharge pressure in response to normal load variationsB. a high oil levelC. incorrect fluid viscosityD. continued slow re-circulation of the oil50. In the design of hydraulic piping and equipment consideration is given to minimize turbulence in the hydraulic fluid as this will cause _______.A. molecular fluid vibrationB. energy lossesC .wide pressure variations D. mechanical damage to control valves51. One factor that determines the frequency of an alternator is the ________.A. number of turns of wire in the armature coilB. number of magnetic polesC. strength of the magnets usedD. output voltage52. What will be the phase angle relationship of a six-pole, three-phase, rotating field generator?A. 60B. 120C. 180D. 36053. To parallel an incoming machine to a running machine therefore it is necessary to ensure firstly that ________.A. two frequencies must be brought into phaseB. the incoming machine accepts a small amount of loadC. the running machine must be unloadD. both voltages are equal54. The frequency of an alternator is controlled from the main switchboard by adjusting the _______.A. frequency meterB. voltage regulatorC. governor controlD. sychroscope switch55. ______ is provided to alternators, in the event of prime mover failure to ensure that the alternator does not act as a motor.A. Reverse current protectionB. Reverse power protectionC. Synchronising deviceD. Frequency meter56. _______ is used to control, modulate, monitor and protect generator set.A. Control panelB. Load panelC. Paralleling panelD. Busbar57. Which of the listed sections of an emergency switchboard is used to supply power for alarm signals under emergency conditions?A. The generator and bus transfer sectionB. The 450 volt, 60 cycle, 3 phase busC. The 120 volt, 3 phase, 60 cycle busD. The 24 volt DC bus58. The ground terminal of a starter should be connected to ________.A. the common ground pointB. the starter’s frameC. the communicatorD. the starter’s mounting bolt s59. Which of the electrical properties listed will always be the same for each component in a parallel circuit?A. ImpedanceB. CurrentC. ResistanceD. Voltage60. In a series circuit, which value will remain unchanged at all places in the circuit?A. V oltageB. CurrentC. ResistanceD. Inductance61. In an alternating current electrical system, a low system power factor is a direct sign of _____A. wasted energyB. efficient operationC. a short in the exciter field windingsD. an excessive number of minor system grounds62. Accidental grounds in a shipboard electrical system must be repaired as soon as possible as they will ________.A. result in immediate power outagesB. damage circuit breakersC. appear on the ground detection systemD. damage insulation and may cause outage63. If the main engine starting consecutively failed _______ times, the cause should be found and the trouble eliminated before next starting.A. 2B. 3C. 4D. 564. The normal color of the exhaust gas of the diesel should be _______.A. achromatism or thin grayB. thin whiteC. sky-blue D black65. After finished with engine, which of the following cannot be shut off by the duty engineer?A. fuel valveB. the main starting valveC. the sea chestD. the main sea water pump inlet valve66. Before the seas get rough, it is a good safety practice to _______.A. secure loose gearB. move quickly about the shipC. increase lightingD. shutdown auxiliary equipment67. A class “C” fire would occur in ________.A. beddingB. pipe insulationC. paintD. a generator68. The most likely place for a fire to start through the process of spontaneous combustion is in _________.A. an electrical switchboardB. the pressure tanksC. the fuel oil tanksD. the oily rag bin69. Which of the fire extinguishers listed is to be weighed annually and sent ashor e for recharging if the weight loss exceeds 10‰of the weight of a full charge?A. FoamB. Soda acidC. Dry chemicalD. Carbon dioxide70. Which of the following components provides a direct source of seawater for the fire main system?A. Rose boxB. Sea chestC. Sluice valveD. Fire pump stuffing box71. When administering artificial respiration, it is of the utmost importance to ________.A. use the mouth-to-mouth methodB. clear airwaysC. use rhythmic pressure methodD. check the injured person’s heartbeat72. Obviously, for a given fuel oil, its pour point is _______ its cloud point.A. lower thanB. higher thanC. as same asD. better than73. ____, where the ship is docked for hull coating renewal, and for any other required underwater work to be carried out, when the opportunity is taken to make other repairs.A. V oyage repairsB. Routine dockingC. Damage repairsD. conversion74. When the dock is refilled with water after docking repair, the first work which should be done by engineer department is ________.A. igniting auxiliary boilerB. releasing air in sea water systemC. starting generatorD. cut off shore power75. The correct tightening is obtained by the use of ______ to measure the extension given to the bolts.A. pressure gaugesB. thermometersC. stretch gaugesD. bridge gauges76. In the Oil Record Book, a comprehensive list of operational items are grouped into operational sections Each section is codified by a/an ________A. numberB. abbreviationC. letterD. number, abbreviation and letterA. an International Ship Security CertificateB. an International Oil Pollution Prevention CertificateC. a Safety Management CertificateD. an International Ballast Water Management Certificate78. Which one is not the “clear grounds” for a more detailed inspection?A. the master and the chief engineer are unable to communicate effectivelyB. serious corrosion on the hullC. damaged sanitary pumpD. one page missing in the oil record book79. “Insufficiency of manning or insufficiency of certification of seafarers” is an identification of a ________A. substandard shipB. standard shipC. over-standard shipD. reference ship80. STCW 78/95 Convention shall apply to seafarers _____ on board seagoing ship entitled to fly the flag of a Party.A. servedB. servingC. surveyedD. surveying81. The officer in charge of the engineering _______ the watch to the relieving officer if there is reason to believe that the latter is obviously not capable of carrying out the watch-keeping duties effectively.A. shall take overB. shall not take overC. shall band overD. shall not hand over82. When the order given by bridge may have bad results, the duty engineer should_____A. inform the captain for a further considerationB. inform the captain, and not perform itC. stop the M/E immediately, and then inform the chief engineerD. stop the M/E immediately, and then inform the captain83. The scuppers should be plugged _____.A. only if fixed containment is not usedB. only if portable containment is not usedC. only if fixed containment drains are openD. whenever the vessel is being bunkered84. If it becomes necessary to pump bilges while a vessel is in port, which of the following procedures should be followed?A. Pump only if the discharge is led to a shore tank or bargeB. Pump only during the hours of darknessC. Pump only on the outgoing tideD. Pump only as much as is necessary85. The SOLAS convention prescribes that in the fire fighting drill the duty engineer should start the fire pump and supply deck water in _______ minute(s)A. 5B. 3C. 2D. 186. According to the ISM CODE, the “person”in the phrase “to designate a person or persons ashore having direct access to the highest lev el of management” refers to ________.A. the manager of the shipping companyB. the master of the shipC. the designated person on board shopD. the designated person ashore87. In order to strengthen maritime security and prevent and suppress acts of terrorism against shipping, a new, comprehensive security regime for international shipping was set to enter into force in July 2004. The new regime is ________.A. ISM CodeB. ISPS CodeC. FSS CodeD. IBCC Code88. In the voyage, when carrying out abandon ship drill, ________ should be test every time.A. the emergency lighting system for muster and abandon shipB. air/oil emergency shut-downC. M.E. emergency operationD. main/auxiliary steering gear changing二．关联题（关联题干下有4个小题，每小题4个选项）第一组Scavenge port inspection provides useful information about the condition of cylinders, pistons, and rings, at low expense. The inspection consists of visually examining the piston, the rings and the lower part of the cylinder liner, directly through the scavenge air ports To reduce the risk of scavenge box fire, remove any oil sludge and carbon deposits in the scavenge air box and receiver in connection with the inspection.The port inspection should be carried out at the first stop after a long voyage, e.g. by anchoring if possible, to obtain the most reliable result with regard to the effectiveness and sufficiency of the cylinder lubrication and the combustion cycle (complete or incomplete)A misleading result may be obtained if the port inspection is carried out after arrival at harbor, since manoeuvring to the quay and low-load running, e.g. river or canal passage, requires increased cylinder oil dosage, i.e. the cylinders are excessively lubricated, Further, during low load, the combustion ccle might not be as effective and complete as expected, due to the actual fuel oil qualities and service (running) condition of the fuel injection equipment. It is highly recommended to take this information into consideration.89. The components of an engine involved in normal scavenge port inspection comprise _______.①the piston ②piston rings ③the lower part of the cylinder liner④the fuel injectorA.①②B. ①②③④C. ②③D. ①②③90. If the scavenge box had too much oil sludge and carbon deposits, what would occur?A. excessive cylinder oil consumptionB. the scavenge box fireC. the crankcase explosionD. excessive wear of the cylinder liner91. In order to obtain the most reliable result with regard to the effectiveness and sufficiency of the cylinder lubrication and the combustion cycle, when should the scavenge port inspection be carried out?A. at the first stop after a long voyage, e.g. by anchoring if possibleB. at the first stop after arrival at harborC. at the first stop after low load runningD. at the first stop after passing river or canal passage92. Under what condition that the scavenge pot inspection can gain a misleading result?①after passed through Panama Canal ②after got alongside shanghai quay ③after arrival shanghai roadstead (外锚地)A. ②③B. ①②C. ①②③ D ①第二组Current regulations with respect to the discharge of oily water set limits of concentration 15 parts per million. A monitor is required to measure these values and provide both continuous records and an alarm where the permitted level is exceeded.The principle used is that of ultra-violet fluorescence. This is the emission of light by a molecule that has absorbed light. During the short interval between absorption and emission, energy is lost and light of a longer wavelength is emitted. Oil fluoresces more readily than water and this provides the means for its detection.A sample is drawn off from the overboard discharge and passes through a sample cell. An ultra-violet light is directed at the sample and the fluorescence is monitored by a photoelectric cell Where an excessive level of contamination is detected an alarm is sounded and diverting valves are operated. The discharging liquid is then passed to a slop tank.93. The passage is mainly about ________.A. oily water separatorB. current regulations related to oil pollutionC. oil in water monitorD. the principle of ultra-violet fluorescence94. A monitor can obtain all of the following functions except _______.A. measuring oil content valuesB. providing continuous recordsC. lowering the oil content below 15 ppmD. providing an alarm unit warning of levels of discharge in excess of 15 ppm95. From the passage, we can learn that the ultra-violet fluorescence is a kind of________A. oil sampleB. lightC. photoelectric cellD. alarm unit96. A sample is drawn off from ______ and passes through a sample cellA. bilge waterB. discharge of oil separatorC. slop tankD. discharge of oily water separator。

甲类三管轮机英语考试真题

【单选】In some cases, when _____ exceeds a pre-set value ,the filter is automatically back flushed with air ,the displaced oil going to auxiliary drain tank where it is subsequently filtered and pumped back into the system A.the differential temperatureB.the differential pressureC.the temperature and pressureD.the pressure【单选】'Insufficiency of manning or insufficiency of certification of seafarers' is an identification of a/an ______.A.substandard shipB.standard shipC.over-standard shipD.reference ship【单选】'Loop,' 'uniflow,' 'crossflow,' and 'return-flow' are terms used to describe various types of ______.A.control air circuitsB.superchargingC.turbochargersD.scavenging【单选】 A DC generator is used to supply direct current in order to maintain an AC generator field and is known as a/an ______.A.rotorB.statorC.exciterD.armature【单选】 A centrifuge arranged to separate two liquids is known as _____.A.an oily water separatorB.a purifierC.a centrifugal compressorD.a clarifier【单选】 A circuit breaker and a fuse have a basic similarity in that they both ______.A.can be reset to energize the circuitB.should open the circuit when overloadedC.will burn out when an over current flow developsD.should short the circuit when overloaded【单选】 A circuit breaker differs from a fuse in that a circuit breaker ______.A.melts and must be replacedB.is enclosed in a tube of insulating material with metal ferrules at each endC.gives no visual indication of having opened the circuitD.trips to break the circuit and may be reset【单选】 A circuit breaker is ______.A.a distribution device B.a lighting equipmentC.the indicating instrumentD.an isolating switch【单选】 A combination combustible gas and oxygen indicator is an instrument that measures the _____ of both combustible gas and oxygen; each is indicated on a separate binationsC.concentrationD.filters【单选】 A diesel engine with a combustion chamber located between the crowns of two pistons is known as a/an ______.A.double-acting engineB.opposed pistons engineC.single-acting engineD.horizontal acting engine【单选】 A fire involving aluminum powder would be a class _________. A.'A' fireB.'B' fireC.'C' fireD.'D' fire【单选】 A hydraulic motor may be driven by ______.A.an electric motorB.a diesel engineC.a compressorD.oil【单选】 A marine diesel engine is started by______.A.supplying high pressure oil into a hydraulic motorB.supplying high temperature air into the cylinderC.supplying high pressure air into the cylinderD.electrical igniting【单选】 A positive displacement pump is that where the volume of the pump chamber is alternately increased to ___ and then decreased to ___. A.draw the liquid in / force the liquid outB.force the liquid out / draw the liquid inC.suction/drawD.deliver/outlet【单选】 A practical way of checking for excessive fuel injection in one cylinder of an operating diesel engine is to ______.A.feel the high pressure fuel lineB.check the cylinder exhausts for white smoke frequentlyC.check the cylinder exhaust temperatureD.isolate each cylinder and inspect the injector【单选】 A segregated ballast system is a system where ______.A.all ballast is processed through the oily water separatorB.ballast is taken on and discharged through a separate main deck riserC.ballast and cargo tanks are separated by cofferdamsD.all ballast lines, tanks, and pumps are independent of those used for oil【单选】 A supercharged diesel engine, when compared to a similar naturally aspirated diesel engine, will develop an increase in ______.A.ignition lagB.engine horsepowerC.lube oil system pressureD.specific fuel consumption【单选】 A viscosity regulator used for an engine is usually provided in order to _____ for an engine burning heavy fuel oil.A.regulate the fuel supplyB.maintain a constant fuel viscosity at the fuel valvesC.maintain efficient coolingD.alter the fuel density【单选】According to STCW, the abilities specified in the standards of competence are grouped as seven functions at three levels of responsibility, which of the following is not one of the three levels?A.Navigational levelB.Management levelC.Operational levelD.Support level【单选】According to the MARPOL CODE, glass, metal and paper materials should ______.A.never be discharged into seaB.be discharged beyond 12 nm from nearest landC.be discharged limited in 12 nm from nearest landD.be discharged to sea【单选】According to the SOLAS convention, the bilge water system ______A.The bilge pump must connect the bilge well suction directlyB.should not pump out the water accumulated in the cargosC.should not be used for emergency drainage in case of ship collisionD.should be connected to the fire fighting system directly【单选】After 'F.W.E.' is given, the air system is shut down, the _____ gear put in, all drains and indicator cocks opened, and the cooling water kept running.A.steeringB.timingC.turningD.running【单选】After 'finished with engine', which of the following cannot be shut off by the duty engineer ?A.fuel oil booster pumpB.the main starting valveC.the sea chestD.the main cooling sea water pump【单选】After taking on fuel oil, the hoses should be disconnected and ______.A.draped over the fantail to dry outB.drained over the side and washed outC.drained into the bilges and washed outD.drained into buckets【单选】Air chambers are usually fitted to reciprocating pumps in order to ___.A.increase discharge pressureB.increase suction vacuumC.develop pulsation flowD.keep a steady rate of flow【单选】All crew's assigned emergency stations can be found on the ship's ______.A.muster listB.certificate of inspectionC.clearance papersD.permit to proceed【单选】All details of fuel bunkering or slop disposal must be entered in the _____.A.rough logB.engine room log bookC.oil record bookD.smooth log【单选】An emergency generator, driven by an internal combustion engine, shall be tested under load for a minimum of 2 hours at least once every ______.A.weekB.2 weeksC.monthD.3 months【单选】An incinerator auxiliary burner can not be ignited. It is NOT caused by______.A.carbon deposits on the electrodesB.defective atomizerC.low oil pressureD.too much water in the oil sludge【单选】An incinerator auxiliary oil-fired burner is used to ignite ______.A.the solidwaste or the oil sludgeB.the solid waste onlyC.the oil sludge onlyD.neither the solid waste nor the oil sludge【单选】Anchor capstans are used in some installation where the cable lifter rotates about a ______. A.horizontal axisB.crankshaftC.vertical axisD.camshaft【单选】As for oil separator, ______contributes to poor separation efficiency and carries over of water into the clean oil outlet.A.A too big gravity discB.A too small gravity discC.The high oil temperatureD.The high speed motor【单选】As the amount of moisture in the air increases, the difference between the dry bulb and wet bulb temperatures will ______.A.increaseB.decreaseC.remain unchangedD.be greatest at dew point【单选】Before doing any work on a hydraulic system equipped with accumulators, you should ______.A.drain the accumulators and purge with oxygenB.bleed off all stored energy from the accumulators completely C.charge the accumulators to prevent system energy lossD.pump the hydraulic fluid into the accumulators to prevent fluid loss【单选】Before starting the engine, the air bottle should be ______.A.pumped up B.loaded C.discharged D.closed【单选】Biological sewage water treatment plant work on the_____.A.heating processB.settling processC.aeration processD.centrifuging process【单选】Cargo handling unit is rated according to the _____ to be lifted.A.cargo craneB.jibC.safe working loadD.oil pressure【单选】Centrifugal pumps, used to handle hot liquids, must have a minimum flow through them under all operating conditions. This flow serves to ______.A.prevent overheating and damage to pump rotating parts due to rubbingB.maintain the net positive suction head of the pumpC.maintain hydraulic differential in the pump impeller passagesD.purge the pump of non-condensable vapors and gases【单选】Coalescence is the breakdown of surface tension between oil droplets in an oil/water mixture, which causes them to join and _____ in size.A.expand B.extract C.increase D.decrease【单选】Combustion gases formed in the cylinder of a diesel engine are prevented from blowing past the piston by ______.A.cylinder pression ringsC.piston skirtsD.oil rings【单选】Cooling of engines is achieved by circulating a cooling liquid around internal ______ within the engine.A.airB.passagesC.pipesD.means【单选】Dual electro-hydraulic steering units usually operate ______.A.with both pumps on line at the same timeB.with one pump on standbyC.with the follow-up gear disconnectedD.only when the rudder is moved amidships【单选】During ______ the gases are driven out of the cylinder by the piston.A.The suction strokeB.The compression strokeC.The expansion strokeD.the exhaust stroke【单选】During purification, if the operating water tank is empty, which of the following malfunctions will appear?A.Some oil will flow from the water outlet of the separator.B.There will be some water in the purified oil.C.Some oil will flow from the sludge outlet of the separator.D.If discharging the sludge, there will be no flushing water.【单选】Each crank is made up of two crank webs joined by a common ______ to which the bottom end bearing is fitted. A.throw B.crankshaft C.crankpin D.crosshead【单选】Each cylinder liner on the marine medium speed engines _____. A.is usually cooled by sea water B.can be replaced when worn out C.is in direct contact with the water in the bore of the cylinder D.can't expand when heated【单选】Electric wires should have each feature of the following except ______.A.flame retardantB.moisture resistantC.oil resistant D.low conductivity【单选】Engine speeds at which resonance can occur are termed ______.A.maximum speedsB.full speedsC.sea speedsD.critical speeds【单选】Equal power factors on paralleled AC generators are maintained by an automatic ________.A.voltage regulatorB.reverse power relayC.reverse current ernor control switch【单选】Failure to open the diesel engine test cocks after a long period of shutdown, prior to starting may result in _______.A.an air bound fuel systemB.damage to cylinder heads and pistonsC.excessive fuel injectionD.excessive air valve lift【单选】Fuel droplets injected into a diesel engine cylinder must have adequate penetration to ______.A.prolong the ignition delay periodB.ensure the beginning of fuel injectionC.thoroughly utilize the air chargeD.allow controlled fuel combustion【单选】Fuel is ignited into a diesel engine cylinder by ______.A.a spark plugB.injectorsC.the heat of compressionD.increasing jacket water temperatures【单选】Full travel of the electronic governor actuator linkage must exceed the ______ travel of the engine fuel control to ensure that the engine fuel control is capable of moving from the 'off' position to 'full fuel'. A.minimumB.averageC.maximumD.half【单选】Heavy residual fuel oils are heated prior to centrifuging to ______.A.reduce fuel weightB.increase specific gravityC.separate fuel from lube oilD.reduce fuel viscosity【单选】How can the chance of contaminating hydraulic fluid be decreased when working on hydraulic systems?A.Clean the fittings before they are disconnected.B.Place drip pans under leaky fittings.C.Seal any cracks in lines with Permatex.D.Coat all threads with graphite oil. 【单选】ISM code has applied to the ships as follows exceptA.Passenger shipsB.Bulk freight vessels of 500 gross tons or moreC.Warship of 500 gross tons or moreD.High-speed craft of 500 gross tons or more【单选】If a cam-controlled engine has a normal injection pressure at rated speed, the injection pressure will be ______ at slow speed.A.a little lower B.a little higherC.too lowD.exactly the same【单选】If a fire ignites in the engine room as a result of a high pressure fuel oil leak, you should FIRST ______.A.secure the ventilationB.find a soda acid extinguisherC.shut off the fuel oil supplyD.secure the generator【单选】If an oil spill occurs on deck, you should ______.A.cover the area with foamB.cover the area with absorbent materialC.wash down immediately with a fire hoseD.wash down immediately with an oil dispersing solvent【单选】If found oil when we open low oil level plug of separator, it indicates _______.A.the separator is overloadedB.the monitor equipment of separator failsC.the discharge pump of separator can not workD.the temperature of oil water is low【单选】If the engine is at rest during maneuver for an extended period the engine should _______, of course, that navigational circumstances permit, before restarting on fuel.A.be turned on airB.be tried on powerC.be turned by the turning gearD.be tested on fuel【单选】If the pump for a hydraulic anchor windlass is overheating, the cause may be ______.A.increased pump speedB.excessive pump discharge pressureC.too low of a tilting box angleD.low pump speed【单选】If the sea water supply pressure for a diesel engine cooling system is below normal, you should check for a ______.A.broken thermostatB.clogged sea water strainerC.blown head gasketD.cracked head【单选】If the speed of a turbocharged diesel engine is maintained constant as the load on the engine is increased, the speed of the turbocharger will ______.A.decrease until the engine speed increasesB.increaseC.decreaseD.remain unchanged【单选】If you heard a 'crackling' noise in a centrifugal pump, the most probable cause of the problem would be ______.A.insufficient speedB.cavitationC.excess discharge pressureD.excessive net positive suction head【单选】Immediately after any diesel engine is started, the engineer should check the ______.A.crankcase pressureB.lube oil pressureC.saltwater pressureD.exhaust temperature【单选】In Maritime Labour Convention, hours of rest may be divided into no more than two periods, one of which shall be at least ___ hour in length, and the interval between consecutive periods of rest shall not exceed 14 hours.A.fourB.fiveC.sixD.seven【单选】In ___ pumps a closed discharge valve will cause bursting discharge pressure.A.centrifugalB.plungerC.injectorD.water【单选】In ______ the control action is independent of the output.A.a closed loop control system B.an open loop control systemC.a boiler control system D.a steering gear control system【单选】In a diesel engine cooling water system, a pH of 6.0 indicates a/an ______.A.slightly acidic conditionB.slightly alkaline conditionC.over-treatment of waterD.neutral condition of water【单选】In a general cargo crane, _____ is fitted to lift the cargo load.A.the slewing motorB.the luffing motorC.the hoisting motorD.the fan motor【单选】In a radial piston pump, reversal and control of fluid flow are accomplished by moving the _______. A.central valveB.radial plungerC.floating ringD.cylinder body【单选】In an air conditioning system, moisture is removed from the air by ______.A.filtersB.separatorsC.ducted trapsD.dehumidifiers【单选】In common rail engines, the fuel is ______ before is injected into the cylinders.A.stored in a common fuel lineB.pumped by the injection pumpC.at low pressureD.already atomized【单选】In some diesel engine designs, the injection of cylinder oil is timed to impinge when the piston is coming upward and only impinge on ______.A.piston skirtB.piston crownC.piston ring belt.D.cylinder ring belt【单选】In the Oil Record Book, a comprehensive list of operational items are grouped into operational sections. Each section is codified by a/an ______.A.numberB.abbreviationC.letterD.number、abbreviation and letter【单选】In the electronic governor actuator, the oil pressure is provided by a ______ pump driven by a shaft connected to the engine camshaft.A.servomotorB.hydraulic motorC.gearD.volute【单选】In the event of a small bunker oil spill on deck occurring while bunkering, youshould ______.A.wash down the area immediately with a fire hoseB.wash down the area with keroseneC.cover the area with absorbent materialD.cover the area with foam【单选】In the event of minor emergencies when the machinery spaces unattended, ______ will be informed of malfunctions in the machinery by his cabin monitor.A.the chief engineerB.the engineer on cabin watchC.the bridge officer on watchD.the master【单选】In the production of freshwater from seawater through a process of heating and cooling, the cooling phase of production is usually called ______.A.evaporationB.distillationC.dehydrationD.condensation【单选】Increasing the temperature of a fuel will _____ its viscosity, and vice-versa.A.increaseB.not changeC.reduceD.add【单选】It ______ for an emergency generator to require paralleling.A.is usual B.is not usualC.is necessaryD.is not impossible【单选】It is important to note that when an excessive amount of water is present in the fuel the temperature for centrifuging must be kept below ______, otherwise forming and agitation of the fuel takes place.A.the condensating point of waterB.the boiling point of waterC.the flash point of the fuelD.the flammable point of the fuel【单选】It is possible to mount a double suction centrifugal pump impeller with the vanes facing in the wrong direction. This would cause the pump ______.A.head capacity to improveB.discharge to be reversedC.efficiency to decreaseD.slippage to decrease【单选】Leakage of hydraulic fluid from around the shaft of a hydraulic motor may be caused by ______.A.permanent loss of pump suctionB.worn shaft sealsC.high level in the oil sumpD.low motor RPM【单选】Loss of lubricating oil pressure to the main propulsion diesel engine will actuate a/an ______.A.over-speed tripB.audible/visual alarmC.the ships/boats general alarmD.reserve oil storage tank【单选】Maintaining the lowest possible scavenging air temperature at all times is not recommended due to the possibility of the ______.A.air charge density becoming too highB.piston crown surfaces becoming too coldC.formation of excessive quantities of pression pressure being greatly reduced【单选】Maximum pressure readings should be taken when the engine is running on ______ as steadily as possible.A.half loadB.full loadC.average loadD.minimum load【单选】Motor controllers are seldom troubled with grounds because ______.A.the auxiliary contacts have a high resistance connectionB.the contactors and relays are mounted on a non-conducting panelC.the resistor banks are composed of individual series-connected unitsD.there are separate switches for the motor and the control【单选】Noxious emissions amount to 0.25～0.4 percent by volume of the exhaust gas, depending on the amount of ______ in the fuel and its lower heat value, and the engine type, speed and efficiency.A.carbonB.sulphurC.oxidD.water【单选】Over-greasing of ball bearings installed on pumps will result in ______.A.smoother pump operationB.overheating of the bearingC.reduced corrosion in the bearingD.increased pump capacity【单选】Owing to its __________, the low speed cross-head diesel engine is widely used on board ship as a main engine.A.smaller size and simple constructionB.long life, lower cost and reliabilityC.easier operation and managementD.simple construction and easier management【单选】Prior to closing the breaker when paralleling two AC generators, the recommended practice is to have the frequency of the incoming machine ______.A.slightly less than the line frequencyB.the same as the line frequencyC.slightly greater than the line frequencyD.have nothing to do with the line frequency【单选】Prior to starting, the purpose of turning over a main propulsion diesel engine with the cylinder test cocks open, is to ______.A.test the starting systemB.remove condensation from the cylindersC.check the compressionD.check for proper lube oil pressure【单选】Reheating a hardened component to a temperature lower than the hardening temperature and then cooling it is known as ______.A.low temperature hardeningB.case hardeningC.annealingD.tempering【单选】Remote control means that _____ .A.the system is manned manuallyB.the system is situated remotely from the operatorC.the system is controlled automaticallyD.the system is controlled from the bridge【单选】Restrictions occurring in the small orifices of pneumatic control system components can be caused by ______.A.moisture in the compressed air supplyB.excessive dryness in the compressed air supplyC.pressure surging in the compressed air receiverD.insufficient lubrication of the system components【单选】STCW Convention describes that _____ are laid down for the certification of engineer officers in charge of a watch in a traditionally manned engine room, or the designated engineer in a periodically unmanned engine room. A.available minimum requirementsB.available maximum requirementsC.mandatory minimum requirementsD.mandatory maximum requirements【单选】STCW Convention states that the officer in charge of the engineering watch is the _____ representative.A.ship-owner'sB.master'sC.chief engineer'sD.manager's【单选】Safe working conditions inside the crankcase are ______, especially for large bore engines where the components are quite heavy.A.reliableB.safetyC.easyD.important【单选】Seawater can be used for drinking ______. A.at a maximum rate of two ounces per dayB.after mixing with an equal quantity of fresh waterC.if gather during or immediately after a hard rainD.under no circumstance【单选】Smaller equipment may be supplied via ______ or miniature circuit breakers.A.exciters mutatorsC.fusesD.wattmeter【单选】The Abbreviation "ERM" in the Manila Amendments to the STCW Convention stands for ______.A.Engine Room ManagementB.Engine Resources ManagementC.Engineer Resources ManagementD.Engine-room Resources Management【单选】The ISM Code is a part of ____.A.SOLASB.MARPOLC.STCWD.Ballast Water convention【单选】The International Management Code for the Safe operation of ships and for Pollution Prevention is referred to as _______.A.ISM CodeB.IOPP CodeC.IMS CodeD.ISPS Code 【单选】The Port Authorities, in accordance with the IMO resolutions have been carrying out _____ to enhance safety of foreign ships.A.CPP B.FPP C.PSC D.FSC【单选】The SMS should provide for specific measures aimed at promoting the_____ of equipment or systems, the sudden operational failure of which may result in hazardous situations.A.visibilityB.abilityC.reliabilityD.capability【单选】The ______of the telemotor is mounted on the steeringgear.A.transmitterB.receiverC.pipesD.charging unit【单选】The ability of lubricating oils to resist viscosity changes during temperature changes is indicated by the ______.A.American Petroleum B.Institute number viscosity index numberC.Seconds Saybolt Furol numberD.Seconds Saybolt Universal number【单选】The activated sludge strength should be checked at regular intervals, and it is good that the color of the aeration compartment water is ______.A.chocolateB.yellowC.blackishD.ivory-white【单选】The air distributor is conventionally driven by ______ and distributes ______ into each cylinder by certain sequence.A.camshaft / fresh airB.camshaft / starting airC.electronic motor which is controlled by a computer / fresh airD.electronic motor which is controlled by a computer / starting air【单选】The burning of ______ is a class‘C’fire.A.diesel oilB.magnesiumC.dunnageD.electrical insulation【单选】The capacity of the supply pump to the separator should correspond with the recommended throughput, or it must be adjusted without the risk of ______ formation.A.sludgeB.emulsionC.oil runoutD.deposit【单选】The clutch band of a constant tensioning mooring winch must be set up tight enough to drive the winch drum and should slip only when ______. A.excessive loads are placed on the winch B.minimum pull is being exerted by the winch C.automatic operation of the winch is desired D.wire is being retrieved at the maximum rate【单选】The cooling water jacket is common to all the cylinders but there are often ______ to ensure that each cylinder receives the right amount and flow of water. A.dividing walls B.divided walls C.dividing liners D.divided jackets【单选】The descriptions about cetane number are TRUE except ______.A.Cetane number indicates ignition qualityB.The lower value the cetane number is of, the poorer the ignition quality will beC.Cetane number isn't the only measurement of ignition quality.D.Cetane number is measured by Redwood instrument【单选】The device that most commonly utilizes the principle of electromagnetic induction is the ______.A.diodeB.transformerC.transistorD.rheostat【单选】The engineer officer in charge of the watch shall ensure that ______are kept under constant surveillance.A.the devices and systems in chargeB.the communication devicesC.the main propulsion plant and auxiliary systemsD.the steering gear【单选】The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and ______.A.reduce water temperatureB.reduce water turbulenceC.provide an air cushionD.allow for an increase in water volume as the engine warms up【单选】The extended aeration process consists of _____ the liquor either by bubbling air through it or by agitating the surface.A.deoxygenating B.oxygenatingC.chemicalizingD.disinfecting【单选】The frequency output of an operating alternator is controlled by the ______.A.relative speed of the rotor polesB.number of turns of wire in the armature coilC.strength of the magnets usedD.output voltage【单选】The instrument which the emergency switchboard doesn't need is ______.A.ammeter B.voltageC.wattmeterD.synchronous meter【单选】The load sharing characteristics of two diesel generators operating in parallel are mostly dependent on their governor ______.A.load limit settingsB.idle speed settingsC.speed limit settingsD.speed droop settings【单选】The lubricating oil purifier may ______ oil from the drain tank and ______ the clean oil into the supply line.A.take; takeB.discharge; takeC.discharge; dischargeD.take; discharge 【单选】The magnetic field is provided by electromagnets so arranged that adjacent poles have ______.A.opposite polarityB.the same polarityC.negative polarityD.positive polarity 【单选】The main objective of ISPS Code is ______.A.to prevent the human injury and the loss of lifeB.to specify the measures to enhance maritime securityC.to avoid the damage to the environment, particularly to the marine environmentD.to ensure the compliance with conventions【单选】The main objective of the SOLAS Convention is ______.A.to specify minimum standards for the construction, equipment and operation of ships.B.to specify minimum standards for the training, certification and watch keeping for seafarers.C.to provide minimum standards for the operation of vessels.D.to tell the company how to run the business.【单选】The majority of automatic mooring winches are _____ to improve the backward efficiency of the gear train for rendering.A.spur gearedB.screw gearedC.worm gearedD.belt driven【单选】The most critical part of the bunkering operations, which can result in an oil spill, is when the ______.A.hose joints are made upB.tanks are being topped offC.system is being lined upD.pumping operation is first started【单选】The officer in charge of an engineering watch shall have the knowledge of ERM principles, including obtaining and maintaining ______.A.situational awarenessB.safety awarenessC.environmental awarenessD.anti-pollution awareness【单选】The officer in charge of the engineering watch shall ensure that at all times bridge orders relating to changes in _____ of operation are immediately implemented. A.ahead or astern B.fore or aft C.up or down D.speed or direction【单选】The only means of removing the latent heat of condensation from a refrigerant in the normal refrigeration cycle is by ______.A.passing it through the expansion valveB.condensing refrigerant in the system condenserC.passing the gaseous refrigerant through the heat interchanger on the suction side of the compressorD.maintaining a high pressure on the system's receiver【单选】The operator of electrical motors should keep a constant check on the loads they carry because ______.A.low loads necessitate frequent insulation cleaningB.exceeding nameplate values shortens useful lifeC.energy is wasted if full loading is not utilizedD.power factor correction methods are load dependent【单选】The overcurrent relay _____ the motor contactor when the motor exceeds its rated current.A.connectsB.tripsC.foulsD.destructs【单选】The part of a fuse that melts and opens the circuit is made of ______.A.copper and antimonyB.steel and babbittC.aluminum or beryllium alloyD.zinc or an alloy of tin and lead【单选】The piston rod scraper box incorporated in a two-stroke/cycle, crosshead diesel engine serves to ______.A.eliminate the necessity for an oil scraper ringB.prevent side thrust and cylinder scoringC.prevent sludge and dirty oil from entering the crankcaseD.scrape oil。

三管轮轮机英语新题(复习资料汇编中)

1.The cylinder covers are secured by eight elastic holding-down________ arranged in four pairs.A. nutsB. screwsC. studsD. flanges2.There is a support ring between the cylinder block and the collar of the cylinder liner, thus carrying both the liner and the cylinder cover. It also passes _________ to the cooling bores and to the coverA. cooling waterB. cooling oilC. refrigerantD. lubricate oil3.A clearly visible benefit of RT-flex engines is their _________ operation at all ship speeds. This is achieved by the superior combustion performance.A. shocklessB. smokelessC. no vibration D . noiseless4.The key feature of the Sulzer RT-flex system is that it gives complete freedom in the _____ and operation of fuel injection and exhaust valve actuation.A. meteringB. controlC. usingD. timing5.The development goals for a large marine engine are many, often interact and in some cases even______ with each otherA. conflictB. accordC. harmonizeD. struggle6.The piston crown employs the usual jet-shaker __________ principle with an arrangement of cooling bores in the crown so that the surface temperatures of the crown are moderate with a very even distribution.A. water coolingB. oil coolingC. air coolingD. combined cooling7.The scavenge air receiver is of a simplified and modular design with integral non-return flaps, hanging cooler ________ and two auxiliary air blowers.A. dozensB.parcelsC. BundlesD. Gallons8. For auxiliary engines the permissible overload is______ for one hour every twelve hours.A. 10%B.15% c.20% D.25%9．Top piston rings are plasma coated. It gives added safety for the ______ of new liners.A. running-inB. running-outC. running_onD.running_down10.Around the combustion chamber, all the main components are ____ to give low thermal strains and the smallest, circumferentially-symmetric deformations for good sealing between piston rings and liner.A. drill cooledB. hole cooledC. tube cooledD. bore cooled11.Around the combustion chamber, all the main components are bore cooled to give low _____ strains and the smallest, circumferentially-symmetric deformations for good sealing between piston rings and liner.A. thermalB. mechanicalC. plasticD. elastic12. The top piston ring is plasma coated to give the lowest wear rate to reach the goal oftwo-years’ _______ with sufficient margin.A. TBOB.CEOC.CFOD. MCR13. Great care is dedicated to the removal of _____ from the scavenge air.A. gravityB. viscosityC. densityD. humidity14.The heavy-duty lubricating oil with chemical_______ has been widely introduced in recent years.A. additivesB. behaviorC. coolantD. desiccant15. ________ on board ship are used to control and distribute the electrical energy generated by generators.A. GovernorsB. AlternatorsC. BlackboardsD. Switchboards16.These acid residues must be prevented from entering the crankcase, otherwise the lube oil would be _______ .A. contaminatedB. emulsifiedC. deterioratedD. oxidated17. Main engines as well as auxiliary engines operating on heavy fuel should have continuous ________ on the lubricating oil, either according to the bypass or batch principles.A. filteringB. centrifugingC. depositingD.operating18. In engines with _____ system, the lubricating oil can be added to the engine through the filling hole in the crankcase cover, by using a hand oil can, or through the separator pipeA. lubricating oilB. dry sumpC. circulated tankD. wet sump19. Governors are equipped with ______ motors for synchronizing, load sharing and frequency control.A. speed settingB. load settingC. speed changingD. load setting20. Engines, which are to be run in parallel have governors specially adapted for the same _______ , about 4% to obtain basic load sharing.A. speed settingsB. speed droopsC. speed dropsD. speed changes21. The air required for combustion is taken from the engine room through a filter fitted on the turbocharger. This reduces the risk for too ____ and contamination of the combustion air.A. high temperaturesB. low temperaturesC. wetD. dirty22. The oil sump, a light welded design, is mounted on the engine block from below and sealed by ________.A. O-ringB. gasketC. washerD. packing船舶受损严重。

《轮机英语》试题（二三管轮）含答案

《轮机英语》试题（二三管轮）含答案《轮机英语》考试复习题(二、三管轮)第一章船舶动力装置1.“Before disconnecting the oil pipe, would you flush the oil retained in the pipe?”asked the oil barge owner.A． by using of fresh waterB．with compressed air √C． by using of sea waterD． with chemical compound2.“Stand by an engine” means _____.A．“prepare to stop the engine”B．“assemble an engine on its bedplate”C．“make an engine ready for starting”√D．“dismantle an engine”3. A _____ is the foundation of the engine, without the support of which the shaft alignmentin particular, and engine structure as a whole, would inevitably be lost.A． FrameB．Bedplate √C． CylinderD． Liner4._____ are commonly used in mechanical-hydraulic governor to sense engine speeds.A． BulbsB． BulksC．Flyweights √D． Flywheels5._____ are generally formed in the frame of the both in-line and Vee engines to givemaintenance access to the crankshaft main and connecting rod large end bearing.A．Doors √B． Aspirate gauzerC． CouplingD． Blind6._____ device is provided to prevent starting air from being admitted to the cylinderbefore the reversing is completed.A．An automatic √B． A transmissionC． A self-regulatingD． An interlocking7._____ fuel oils _____ lubricating oils require treatment before passing to the engine.A．Both/and √B． Neither/norD． Both/or8._____ is sometimes used for piston cooling since leaks into the crankcase would not causeproblems.A． Diesel oilB． Hydraulic oilC．Lube oil √D． Mineral oil9._____ is the removal of exhaust gases by blowing in fresh air.A． Gas exchangeB． ChargingC．Scavenging √D． Supercharging10._____ is used for cylinder and cylinder head, the salt water is used for cooling thelubricating oil, the fresh water in the coolers and the charging air in the air cooler.A． The fuel oilB． The lube oilC． The sea waterD．The fresh water √11._____ may be the first possible cause which makes the engine to lose power or slow downwhen it is running.A．Hot bearing √B． Starting valvesC． Unequal distribution of loadD． Excessive crankshaft clearance12._____ of an engine crankshaft can be detected by measuring deflections of crank websfor each unit of the engine.A．Misalignment √B． LengthC． StrengthD． Stresses13._____ of the A-frames there is a strong cast iron frame called the scavenging air box.A．At the top √B． At the bottomC． In the topD． In the bottom14._____ pistons have low inertia and high coefficient of thermal expansion.A． Cast ironB． Cast steelD．Aluminum √15._____ should not undertake any task which will interfere with the supervision dutiesrelating to the main machinery and associated equipment.A．The watch keeping personnel √B． The chief engineerC． The person on a bunker bargeD． Any of the above16._____ the cylinder will contain a great weight of air and will be capable of burninga great quantity of fuel.A．At the beginning of the compression stroke √B． At the beginning of the suction strokeC． At the end of the working strokeD． At the end of the exhaust stroke17._____ the supercharge pressure is, _____ power an engine develops.A．The higher/the more √B． Higher/moreC． Higher/littleD． The higher/the less18._____ is not properly set thus causing either advanced or retarded firing.A． A pistonB．A fuel injection pump √C． A feed water pumpD． A lube oil pump19._____ rods are not in proper condition so that too much fuel is supplied to thecorresponding cylinder.A． PistonB． SoundingC．Regulating √D． Connecting20._____ shows 1.2 meter and the specific gravity of the oil is 0.96According to the measuringscale, that makes 150 tons.A． The piston rodB． The push rodC．The sounding rod √D． The connecting rod21._____ allows for expansion and water make up in the water cooling system.A． A top tankB．A head tank √D． A drain tank22._____ at the end of the distribution pipe ensures that adequate pressure is maintainedby the pump.A． A relief valveB．An alarm √C． A pressure gaugeD． A non-maim valve23._____ is used for washing and drinking.A． The ballast systemB． The salt water systemC． The bilge systemD．The domestic system √24._____ provide the water to the pistons.A． Pneumatic pipesB． Hydraulic pipesC．Telescopic pipes √D． Operating gas pipes25._____ are fitted in the exhaust system and facilitate charge removal and scavenging ineach cylinder.A．Diffusers √B． CompressorsC． Steam boilersD． Soot blowers26._____ are formed by abrasive particles entering the bearing and scoring the shaft.A．Grooves √B． RecessesC． RidgesD． Nips27._____ are mounted on and bolted to the bed-plate cross girders.A． The crankshaftB． The crankcaseC． The guide-waysD．The frames √28._____ is a precaution which contributes to avoiding trouble under normal operatingconditions.A．Constant inspection √B． Keeping constant loadC． Remaining constant temperatureD． varying speed29._____ is a source of power by which the diesel engine may operate.A． Water energyB． Electrical energyC． Chemical energyD．Heat energy √30._____ is arranged for cleaning the lubricating oil in the system and clean oil can beprovided from a storage tank.A． A filterB．A centrifuge √C． A distillerD． A generator31._____ is fully floating in both connecting rod small end and the piston skirt.A． The piston rodB． The cross head pinC．The gudgeon pin √D． The crank-pin32._____ is made of a boss with separated blades mounted into it.A．A variable pitch propeller √B． A variable pitch nutC． A fixed pitch parallelD． A fixed pitch screw33._____ is usually driven by the engine camshaft andsupplies pilot air to the cylinderair start valve.A． An air receiverB． An operating valveC． An automatic valveD．An air distributor √34._____ neutralizes the acid conditions and_____ cleanses the rings and grooves.A． The detergency/the alkalinityB．The alkalinity/the detergency √C． The inhabitant/the waterD． The additives/the distilled water35._____ or air venting arrangement is fitted to the fuel supply passage.A． An air pumpB． A compressorC． A fuel pumpD．A priming √36._____ providing lubricating films, oil used in marine diesel engines have to remove heatfrom oil cooled piston.A． Except forB． BesideC． ExceptD． In additi on to √37._____ the engines, the diesel engine is_____ used engine on board.A． Between/more commonlyB．Among/the most commonly √C． Between/not more commonlyD． Among/not the most commonly38._____ water is more expensive than fresh waterIt has high specific heat and low viscosity.A．Distilled √B． DistillingC． BoilingD． Boiled39._____ for the camshaft gear train is taken from a spur gear which for a six cylinderengine is at the coupling end.A． The driven gearB．The drive √C． The greaseD． The lubricating oil40._____ in what position the engine stops there will always be at least one of the cylinderswith its starting air valve open to admit compressed air to start the engine.A． BecauseB． Owing toC． ForD．No matter √41._____ is secured by means of side-chock bolts and end-chock bolts.A．The bedplate √B． The columnC． The main bearingD． The double bottom42._____ usually helps to induce air movement to assist combustion.A． Cylinder coverB． Main bearingC． The exhaust valveD． The p iston movement √43._____ may have two emergency source of power, thus requiring two emergency switchboards.A．Large passenger vessels √B． General cargo shipsC． Container shipsD． Oil tankers44._____ supplies pilot air to control the cylinder air start valves.A． An air compressorB． An indicator cockC．An air distributor √D． A safety valve45._____ clearances in the main or crank pin bearings will sometimes be indicated by lossof pressure in the lubricating system before any bearing knock is heard.A． T oo largerB． Too smallerC． ExcessD．Excessive √46.A cast steel strong back is fitted in way of the combustion space to help absorb _____.A． flame temperatureB． fuel oilC． air movementD．gas forces √47.A charge of fresh air is drawn into the engine cylinder and then _____ by the movingpiston_____ very high pressure.A． pressed/toB． pressurized/withC． pushed/inD．compressed/to √48.A common trouble with the fuel pump plunger or fuel valve spindle is _____.A． water leakageB． steam leakageC．oil leakage √D． air leakage49.A common trouble with the fuel pump plungers or fuel valve spindle is _____.A． broken downB． stuckC．oil leakage √D． carbonized50.A diesel engine is similar to a gasoline engine except that the former has no _____.A． cross-headB． cylinderC． connecting rodD．spark plug √51.A diesel engines crankcase oil level is found to be too highYou should suspect that _____.A． the engine was over filledB． there might be a fuel leakC． there might be a water leakD． all of the above √52.A distance piece, known as a _____ may be interposed between the rod and the bearinghousing.A． bearing shellB． bearing linerC．compression plate √D． lead wire53.A distance piece, with ground faces, known as a compression plate, may be interposedbetween the rod and the beating housing, its thickness being chosen to ensure the correct _____.A． compression pressureB． compression testC．compression ratio √D． compression clearance54.A distance piece, with ground faces, may be interposed between the rod and the bearinghousing, its thickness being chosen to ensure the correct _____.A． expansion ratioB． pressure ratioC．compression ratio √D． clearance ratio55.A governor automatically controls engine speed by regulating _____.A． fuel s upply √B． firing orderC． engine loadD． oil level56.A gudgeon pin in a trunk piston may be free to float and rotate, with _____ to limitaxial movement.A． split pinsB． crankpinsC． dipsticksD．circlips √57.A heater in the circuit facilitates warning of the engine prior to ____ by circulatinghot water.A．starting √B． stoppingC． to startD． to stop58.A high temperature alarm or _____ which will melt is used to guard against the explosionof compressor air pipelines.A． a flame trapB． a relief valveC．a fusible plug √D． a bursting cap59.A hot air start pipe indicates that there is _____.A． inefficient coolingB．a leaking air start valve √C． a clogged drain valveD． a leaking air bottle60.A level gauge for a tank is to _____.A． give the pressureB．give the contents √C． give the shape of the tankD． give the accuracy level61.A lubricant often has to perform many duties in any situation, in addition to itsfundamental job of_____.A． resisting oxidizationB．reducing friction √C． promoting moving speedD． developing inertia62.A main bearing consists of two shells which are secured by means of studs and _____.A． tie rodsB． through boltsC． lead wiresD．bearing caps √63.A number of cylinder liners are enclosed in one cast iron casing to form a _____.A． cylinder coverB．cylinder block √C． cylinder frameD． bed-plate64.A reduction in load on a diesel engine results in _____ of speed of the crankshaft.A． a reductionB．an increase √C． an outingD． a downwards65.A separate piston cooling system is used _____ any contamination from piston coolingglands to the piston cooling system only.A． to helpB．to limit √C． to protectD． to remove66.A separate piston cooling system is used to limit any contamination _____ piston coolingglands_____ the piston cooling system only.A． between, toB． either, orC．from, to √D． neither, nor67.A single piece_____ fitted with bronze rings guides the piston in the cylinder liner.A．piston skirt √B． piston crownC． guide wayD． cross-head68.A variable pitch propeller is made _____ a boss with separate blades mounted into it.A． ofB．up of √C． fromD． out69.A: Please tell me the specifications and quantityB: _____.A． Pump diesel oil firstB．300 tons of 180 cst fuel oil √C． The figure is all rightD．OK, I’ll sign it70.About half an hour before the engine is required, cooling water at _____ must be circulated.A． more than the working temperatureB． less than the working temperatureC．the working temperature √D． the same as the surrounding temperature71.According to the way the energy of the exhaust gases is utilized, pressure-charging canbe divided into two main systems, namely, the constant-pressure system and _____.A． the pulse-phase systemB． the pulse Doppler systemC．the pulse system √D． the pulse interval72.Acid solution in the system can be tested from time to time by putting some on to a pieceof lime.A．strength √B． denseC． percentageD． velocity73.Additives _____ protective layers on metal surfaces guarding them against corrosion.A． damageB．form √C． dissolveD． contaminate74.Adjust _____ by means of lead wire.A．the clearance of the main bearing √B． the diameter of main bearingC． the gap of main beatingD． the tolerance of main bearing75.Administrations should bear in mind the significance of_____ in maintaining safety oflife and property at sea and in preventing marine pollution.A． advanced nautical equipmentB． advanced performance main enginesC． emergency equipmentD． communicati on and language skills √76.A-frames and cylinder block is held together by _____ to form a rigid structure.A． connecting rodsB． piston rodsC．tie rods √D． jack-bolts77.A-frames are mounted on the bed plate and support _____ and cylinder block.A． the main bearingB． the cylinder coverC．the entablature √D． the sump78.After "F.W.E." is given, the air system is shut down, the _____ gear put in, all drainsand indicator cocks opened, and the cooling water kept running.A． steeringB． timingC．turning √D． running79.After ensuring that the _____ is correct the bearing clearance should be checked.A． napB． gapC．nip √D． deflection80.After fitting back in place the gear wheels, dont forget _____ them.A．to grease √B． greasingC． oilingD． lubricating81.After passing through the turbine the exhaust gas is conducted out into the _____.A． intercoolerB． compressorC． cylinderD．open air √82.After the engine is warned, we should_____ the turning gear before starting up the engine.A． take inB． put inC．take out √D． put up83.After the order “_____” is given, the air system is shut down, the turning gear putin.A．Finished with Engine √B． Stop the EngineC． Stand-by EngineD． Slow-down Engine84.Air cocks, usually positioned at the _____ in a circulating system, is used to get ridof the air in the system.A． bending jointB． expansion tankC． weldD．the highest point √85.All the rings are slightly rounded on their external top and bottom edges to keep theoil film on the cylinder liner during _____ for new piston rings.A． the running-in period √B． the running processC． gas exchange processD． the boiler firing86.All three systems have the ports _____ to swirl the incoming air and direct it in theappropriate path.A． angledB． roundedC． being angledD．being rounded √87.Although the crankshafts of medium diesel engines appear to be robust, they rely on thesupport of _____ to develop their full strength.A． the piston rodsB． the crank throwsC． the thrust bearingsD． the main bear ings √88.Aluminum pistons have _____ coefficient of thermal expansion compared with those of castiron.A．higher √B． lowerC． the sameD． none of the above89.Among the rings of a piston the _____ one is subjected to the greatest load and temperature.A． bottomB． middleC．top √D． none of the above90.An aluminum piston has lower inertia and higher coefficient of _____ compared to thatof cast iron.A． viscosityB． twisting momentsC． inertiaD．thermal expansion √91.An electrically driven automatically operating auxiliary blower is provided for slowspeed and _____ of a low speed diesel engine.A．manoeuvring operations √B． bad combustionC． coolingD． mooring trial92.An increase in load on a diesel engine results in _____ of speed of the crankshaft.A．a reduction √B． an increaseC． an outingD． a downwards93.An interlock in the remote operating valve line stops the valve _____ when the engineturning gear is engaged.A． to openB．opening √C． openD． opened94.An overspeed safety device is usually fitted to a generator engine for _____ in the eventof overspeed.A．cutting power off the engine √B． increasing the fuel pump settingC． braking the crankshaftD． stabilizing the ship speed95.As a heat engine, _____ energy is the source of power by which the diesel engine canbe operated.A． electricB．heat √C． mechanicalD． exhaust96.As for a diesel engine, lack of combustion air may be due to _____.A．fouling turbine √B． fuel pump faultsC． lubrication failureD． excessive cooling97.As the plunger moves up, the ports are closed and the fuel _____ and delivered to theinjector nozzle at very high pressure.A． being compressedB． to be pumped upC．is pressurized √D． are built up98.At least _____ cylinders in four-stroke engine will be configured to ensure that theengine can be started with the crankshaft at whatever position.A．6 √B． 2C． 12D． 899.At the top of the A-frames there is a strong cast iron frame called _____.A． cylinder linerB． cylinder coverC． the gear boxD． the sc avenging box √100.Be sure to make the engine turn by _____ before starting and after stopping.A． steering gearB．turning gear √C． steering wheelD． turning cycle101.Bearing knocks are likely to occur from _____.A． less clearanceB． dirty lube oilC． overloadD．bearing wear √102.Because the castings of smaller engines are not so big and heavy, _____ and cylinder block may be made in one piece.A．the column √B． the jacketC． cylinder coverD． cylinder liner103.Bedplates are the _____ of the engine, without the support of which the shaft alignment in particular, and engine structure as a whole, would inevitably be lost.A． hullB． projectionC． graphitizationD．foundation √104.Before "stand-by" is rung on the engine telegraph, it is usual to give the main engine _____ ahead and astern.A． a brief trial with turning gearB．a brief trial on power √C． a long trial by steering gearD． one minutes trial with windlass105.Before a marine diesel engine is started the cylinders and pistons must be _____.A． cooled to appropriate temperatureB．warmed up gradually to appropriate temperature √C． opened up and renewedD． ground and polished106.Before being used the fuel service tank should be drained of _____.A． soda solutionB． mechanical impuritiesC． ballastD．water and residuals √107.Before pumping up the crankcase oil, _____ should be worked by hand to minimize corrosive action on the liners.B． the starting valvesC．the cylinder lubricators √D． the turning gear108.Before replacing a piston you should check that all rings are _____.A．free √B． fastenedC． brokenD． stuck109.Before replacing a piston you should check the rings to see that all clearances and gaps are _____ the permissible tolerances.A． aboveB． atC． overD．within √110.Before replacing a piston you should check the rings to see that all clearances and gaps are within the permissible _____.A． deflectionB． discrepancyC． errorD．tolerance √111.Before starting the engine the air bottle should be _____.A．pumped up √B． loadedC． dischargedD． opened112.Before starting the turning gear, _____ should be worked by hand to minimize corrosive action on the liners.B． the starting valvesC．the cylinder lubricators √D． the turning gear113.Blow-off of the relief valves of the engines cylinders may be caused by _____.A． too low leadB． water in fuelC． too tight springD．leakage √114.Blow-off of the relief valves of the main cylinders during operation indicates _____.A． the cylinder cover is crackedB． the injector holes is cloggedC．the cams are not properly set √D． fuel pump is leaking115.Bridge gauge can be used to measure _____ of a diesel engine.A．diameters of journals √B． deflections of crankwebsC． diameters of crankpinsD． none of the above116.Care and cleanliness are required when installing diesel fuel filters _____.A． to prevent the fuel system from becoming air-houndB． to prevent the fuel system becoming clogged with dirty particlesC． both of the abo ve √D．to prevent the lubricating oil from leaking out of the filter element117.Cast iron carrier rings, _____ machined grooves, are provided for all the pistons.A．caulked into √B． caulking intoC． pressed intoD． screwed into118.Charging is the filling of the engine cylinder with a supply of _____ for compression.A． waterB．fresh air √C． fuel oilD． gas119.Charging is the filling of the engine cylinder with a supply or charge of fresh air _____ compression.A． to needB．ready for √C． want toD． going to be120.Charging-air pressure increases if there is incorrect combustion and drop in the _____ of the diesel engine.A． machine efficiencyB． machinery efficiencyC．mechanical efficiency √D． mechanics efficiency/doc/5c7732040.html,pressed air is supplied by air compression to _____.A．the air receivers √B． the starting valvesC． the cylinder coversD． the distributors/doc/5c7732040.html,pressed air is used on board ship _____.A． for starting diesel enginesB． in pneumatic control systemC． in pneumatic toolsD．All the above are true √123.Constant cooling the various components of diesel engine has a number of functions except for _____.A． good lubricationB． low thermal stressC． good mechanical propertiesD．acid corrosion √124.Cooling enables the engine metals _____ their mechanical properties.A．to retain √B． to remainC． to maintenanceD． to have125.Cooling of engine is achieved by circulation a cooling liquid around internal passages within the _____.A． boilerB． heaterC．engine √D． cooler126.Cooling of engines is achieved by _____ a cooling liquid around internal passages within the engine.A． flowedB． flowingC． mixingD．circulating √127.Cooling of engines is achieved by circulating a cooling liquid around internal _____ within the engine.A． air。

三管轮轮机英语试题泵教材

1079. _____ at the end of the distribution pipe ensures that adequate pressure is maintained by the pump.A. A relief valveB. An alarmC. A pressure gaugeD. A non-maim valve1080. In general, _____ is suitable for delivering small quantities at high pressure. A. reciprocating pump B. gear pumpC. centrifugal pumpD. vane pump1081. The pumps employed on board ship can be divided into two main categories i.e. _____ pumps and centrifugal pumps.A. gearB. nonpositive displacementC. positive displacementD. rotary 1082. Lube oil pumps taking suction from the sump of most small marine engines are usually _____.A. of the diaphragm typeB. of the centrifugal typeC. of the positive displacement typeD. independently driven by electric motors 1083. The lube oil pump used in a diesel engine is a_____.A. volute pumpB. centrifugal pumpC. diaphragm pumpD. gear pump1084. Which of the following conditions could cause the feed pump for an auxiliary boiler to lose suction?A. Increased suction head pressure.B. Decreased feedwater temperature.C. Pump recirculating line being open too much.D. Excessive feedwater temperature.1085. A vane pump belongs to_____ according to its working principle.A. reciprocating pumpB. positive displacement pumpC. centrifugal pumpD. centripetal pump1086. Through a_____ pump, the liquid is transferred from the suction to the discharge by the mechanical variation of the volume of a chamber or chambers.A. positive displacementB. ejectorC. centrifugalD. air compressor 1087. A mono-pump is a single-screw pump. That means it consists of_____ rotor(s).A. oneB. twoC. threeD. four1088. The gear and screw pumps are classified as_____.A. variable stroke pumpsB. multistage pumpsC. positive displacement pumpsD. triple-ported pumps1089. Gear pumps are of positive displacement type pumps because they discharge a near constant amount of liquid_____ pressure.A. depending onB. in relative toC. regardless ofD. because of 1090. A gear pump belongs to_____ according to its working principle.A. reciprocating pumpsB. positive displacement pumpsC. centrifugal pumpsD. centripetal pumps1091. The pressure head of a pump is given in the unit of_____.A. kgB. MPaC. meter fluid columnD. None of the above is true. 1092. A centrifugal pump produces the required pressure energy by means of a rotating _____ provided with vanes.A. propellerB. impellerC. circumferenceD. screw1093. The discharge flow of a reciprocating pump is_____.A. steadyB. in pulsationC. continuousD. large 1094. In a_____ the center screw is driven and the outer screws idle.A. single screw pumpB. double-screw pumpC. triple screw pumpD. centripetal pump1095. A Screw pump belongs to_____ according to its working principle.A. reciprocating pumpsB. positive displacement pumpsC. centrifugal pumpsD. centripetal pumps1096. The amount of fluid delivered by a screw pump can be regulated by_____. A. throttling the pressure line B. changing the speed of the rotorC. either A or BD. None of the above is tree.1097. While flowing through the volute in a centrifugal pump, part of the_____ energy of the liquid is converted to_____ energy.A. kinetic/pressureB. kinetic/essentialC. pressure/kineticD. pressure/height1098. The amount of fluid delivered by a centrifugal pump can be regulated by_____.A. throttling the pressure lineB. changing the speed of the rotorC. either A or BD. None of the above is tree.1099. The amount of fluid delivered by a reciprocating pump can be regulated by_____.A. throttling the pressure lineB. changing the speed of the pistonC. either A or BD. None of the above is tree.1100. The amount of fluid delivered by a positive displacement pump can be regulated by_____.A. throttling the pressure lineB. changing the speed of the driving rotorC. either A or BD. None of the above is tree.1101. Which of the following pumps are self-priming, and can deal with liquid from a level below the pump? (1) reciprocating; (2) rotary; (3) centrifugal.A. (1) onlyB. (1)and (2)C. (1), (2) and (3)D.(2)and (3)1102. The amount of fluid delivered by a helical pump can be regulated by_____. A. throttling the pressure line B. changing the speed of the rotorC. either A or BD. None of the above is tree.1103. A positive displacement pump is that where the volume of the pump chamber is alternately increased to_____ and then decreased to_____.A. draw the liquid in / force the liquid outB. force the liquid out / draw the liquid inC. suction/drawD. deliver/outlet1104. Throttling in the_____ line of a centrifugal pump involves the risk of the pump cavitation.A. suctionB. exhaustC. pressureD. discharge 1105. As for a hydraulic single action vane pump, the inner wall of the stator is usually of_____ shape.A. circularB. ellipticalC. rectangularD. hexagon 1106. As for a hydraulic vane pump, which of the following is in contact with the vanes during working: (1)the rotor; (2)the pump shaft; (3)the external surface of the housing.A. (1) onlyB. (2) onlyC. (1) and (2)D. (1),(2) and (3)1107. Shaft sealing in a centrifugal pump can be effected by_____.A. the mechanical sealB. packed stuffing boxesC. either A or BD. neither A nor B1108. A reciprocating pump belongs to_____ according to its working principle. A. injector pumps B. positive displacement pumpsC. centrifugal pumpD. centripetal pumps1109. A_____ pump is that where the volume of the pump chamber is alternately increased to draw the liquid in and then decreased to force the liquid out.A. injectorB. positive displacementC. centrifugalD. centripetal1110. What is the purpose of a relief valve?A. to fill 2 tanks at the same timeB. to use pump at a higher pressureC. to return liquid to suction side if discharge valve is closedD. All of the above are true.1111.The pump discharge pressure will be considerably higher than the pressure at the_____.A. pump entry branchB. outlet pipeC. impellerD. None of the above is true.1112. Which of the following pumps belongs to centrifugal pump?A. Piston pumpB. Screw pumpC. Diffuser pumpD. Water-ring pump1113. The volute pump is one in which the impeller_____.A. discharges into a gradually widening channelB. has stationary diffuser vanesC. produces no kinetic energyD. All of the above are true.1114. In_____ pumps a closed discharge valve will cause bursting discharge pressure.A. centrifugalB. plungerC. injectorD. water1115. Which of the following pumps are self-priming, and can deal with liquid from a level below the pump; (1) ejector;(2) screw;(3) centrifugal.A. (1) onlyB. (1) and (2)C. (1),(2) and (3)D. (2) and (3)1116. The amount of fluid delivered by a gear pump can be regulated by_____.A. throttling the pressure lineB. changing the speed of the rotorC. either A or BD. None of the above is true1117. Attempts are made to eliminate axial thrust in centrifugal pump by_____.A. providing the impeller with balancing holesB. the use of symmetrical impellerC. neither A nor BD. either A or B1118. Which of the following pumps will build up a bursting pressure or stall their motors if the discharge valves are closed? (1) gear; (2) centrifugal; (3) screw.A. (1) and (2)B. (1),(2) and (3)C. (1) and (3)D. (2) and (3)1119. Which of the following operating features do displacement pumps bear if they are working under no-cavitation condition? (1) output is almost directly proportional to speed; (2) they are self-priming; (3) they will develop a discharged pressure equal to the resistance to be overcome, irrespective of speed.A. (1) and (2)B. (2) and (3)C. (1) and (3)D. (1), (2) and (3)1120. The_____ pump discharges a nearly constant amount of liquid regardless of pressure.A. mixed-flowB. axial-flowC. centrifugalD. displacement 1121. Which of the following pumps is used where a relatively high pressure and small capacity are required?A. V olute pumpB. Diffuser pumpC. Regenerative pumpD. All of the above1122. Some pumps use packing as sealing gland. The gland should be_____.A. slack enough to allow slight leakage of fluidB. slightly clockedC. brought up tight so as not to allow any leakageD. fitted with a relief valve 1123. Air chambers are usually fitted to reciprocating pumps in order to_____.A. increase discharge pressureB. increase suction vacuumC. develop pulsation flowD. keep a steady rate of flow1124. The pipe friction and the resistance will_____ as a result of an increase in the amount of fluid flowing through the system.A. reduceB. riseC. raiseD. fall1125. Which of the following will be the advantage of a centrifugal pump as compared with a reciprocating pump? (1) Its discharge is continuous; (2) It has no internal valves; (3) Upon accidental closing of discharge valve, excessive pressure will not build up.A. (1), (2)B. (2),(3)C. (1), (2), (3)D. (2) only1126. Which of the following pumps are self-priming, and can deal with liquid from a level below the pump: (1)reciprocating; (2)vane; (3) gear.A. (1) onlyB. (1) and (2)C. (2) and (3)D. (1), (2) and(3) 1127. Centrifugal pumps can be designed with a number of impellers_____ to attain a high final delivery pressure.A. in seriesB. in parallelC. either A or BD. None of the above is tree1128. With reference to an axial piston pump, which one of the following statements is true ?A. The cylindrical barrel is coupled to the motor.B. The cylindrical barrel has an odd number of bores.C. The bores end in sockets.D. The sockets fit in the swash plate.1129. With reference to a radial piston pump, which one of the following statements is false ?A. Surrounding the fixed shaft is a hollow shaft.B. This hollow shaft carries radial bores.C. Each bore is fitted with a well-lapped plunger.D. There are always even numbers of bores.1130. Under rotary pumps are the gear, _____, cam-and-piston and screw types.A. reciprocatingB. diffuserC. turbineD. vane1131. The engine fuel oil system should be primed by using_____, and the system cleared of air by means of the various air vent cocks.A. the priming pumpB. the transfer pumpC. the hydraulic pumpD. injector pump 1132. Domestic water pump is started automatically by_____ which operates as the water level falls to a predetermined level.A. a level controllerB. a temperature switchC. a pressure switchD. a floating ball 1133. The pumps employed on board ship can be divided into two main categories, i.e._____ pumps and centrifugal pumps.A. gearB. non-positive displacementC. positive displacementD. rotary 1134. Under centrifugal pumps are the volute, diffuser, mixed-flow, axial flow and_____ or regenerative types.A. reciprocatingB. hydraulicC. turbineD. vane 1135. In general, _____ is suitable for delivering small quantifies at high pressure. A. reciprocating pump B. gear pumpC. centrifugal pumpD. vane pump1136. The various pumps and lines are _____ to some extent so that each pump can act as an alternative for another.A. interlockedB. interconnectedC. interferedD. interacted 1137. _____ are more suitable for large quantities at low pressure.A. Reciprocating pumpsB. Rotary pumpsC. Centrifugal pumpsD. Gear pumps1138. Gear pumps are _____ type because they discharge a near constant amount of liquid regardless of pressure.A. positive displacementB. non-positive displacementC. mixed-flowD. axial-flow1139. Centrifugal pumps are non-positive and a fairly_____ unit.A. low pressureB. low dischargeC. low speedD. high pressure 1140. In_____ pump a closed discharge valve will not cause excessive pressure to build up.A. gearB. vaneC. screwD. centrifugal1141. Centrifugal pumps are popular because they are very simple in construction, and produce smooth, constant, _____ discharge.A. non-pulsatingB. pulsatingC. positiveD. non-positive 1142. Sealing in pump shaft is achieved by means of the_____.A. gasketB. packingC. washerD. spring1143. Centrifugal pumps, however, can be designed with a number of impellers_____ to attain a large amount of liquid.A. in seriesB. in parallelC. assembledD. together1144. Gear pumps are_____ because they discharge a near constant amount of liquid regardless of pressure.A. negative displacement typeB. turbine typeC. positive displacement typeD. mixed-flow type1145. The_____ discharge a nearly constant amount of liquid regardless of pressure.A. mixed-flow pumpB. axial-flow pumpC. centrifugal pumpD. displacement pump1146. The gear, screw, and vane pumps are all classified as_____.A. variable stroke pumpsB. multistage pumpsC. positive displacement pumpsD. triple-ported pumps1147. Which of the following are components of a mechanical seal? (1) stationaryring; (2) rotational ring; (3) packing; (4)spring.A. (1), (2) and (3)B. (1), (2) and (4)C. (2), (3) and (4)D. None of the above. 1148. The pressure head of a water pump is given in the unit of_____.A. kgB. MPaC. mH20D. None of the above.1149. A vane pump belongs to_____ according to its working principle.A. reciprocating pumpsB. positive displacement pumpsC. centrifugal pumpsD. centripetal pumps1150. Attempts are made to eliminate axial thrust in centrifugal pump by_____.A. providing the impeller with counterbalancing holesB. the use of symmetrical impellerC. neither A nor BD. A and B (either A or B)1151. Air chambers are usually fitted to reciprocating pumps in order to_____.A. increase discharge pressureB. increase suction vacuumC. develop pulsation flowD. keep a steady rate of flow 1152. A positive displacement pump is that where the volume of the pump chamber is alternately_____ to draw the liquid in and then_____ to force the liquid out.A. increased / decreasedB. decreased/increasedC. decreased/decreasedD. increased/increased1153. Which of the following pumps are self-priming, and can deal with liquid from a level below the pump? (1) reciprocating; (2) rotary; (3) centrifugal.A. (1) onlyB. (1) and (2)C. (1), (2) and (3)D. (2) and (3)1154. Which of the following pumps are self-priming, and can deal with liquid from a level below the pump? (1) reeiproeating; (2) vane; (3) gear.A. (1) onlyB. (1) and (2)C. (1), (2) and (3)D. (2) and (3)1155. A pump is said to have "negative suction head" when the pump is located_____.A. between the suction and dischargeB. below the liquid supplyC. above the liquid supplyD. any of the above1156. If a bilge pump failed to build up discharge pressure, you should check for_____.A. excessive water in the bilgesB. a clogged suction straine rC. oil in the bilgesD. a closed skin valve1157. The advantage of a centrifugal pump as compared with a reciprocating pump is that _____.A. discharge is continuousB. it has no internal valvesC. upon accidental closing of discharge valve, excessive pressure will not build upD. all of the above are true1158. Which of the following pumps belongs to centrifugal pump?A. Reciprocating pump.B. Screw pump.C. Diffuser pump.D. Water-ring pump. 1159. While flowing through the volute in a centrifugal, part of the_____ energy of the liquid is converted to_____ energy.A. kinetic/pressureB. kinetic/essentialC. pressure/kineticD. pressure/height1160. When a hydraulic vane pump is working, which of the following is in contact with the vanes? (1) the rotor; (2) the internal surface of the housing; (3) the external surface of the housing.A. (1) onlyB. (2) onlyC. (1) and (2)D. (1), (2) and (3) 1161. It is possible to mount a double suction centrifugal pump impeller with the vanes facing in the wrong direction. This would cause the pump_____.A. head capacity to improveB. discharge to be reversedC. efficiency to decreaseD. slippage to decrease1162. A double suction centrifugal pump impeller has been installed in the reverse direction, and will_____.A. have a greater head capacityB. operate with increased impeller efficiencyC. discharge through the suction side of the pump casingD. require more power to run the shaft1163. If a centrifugal pump were continually operated with the discharge valve closed, the _____.A. motor controller overload would openB. pump would eventually overheatC. relief valve would continuously cycle openD. motor would overheat1164. A centrifugal bilge pump requires priming_____.A. primarily to lubricate the shaft sealsB. due to the inability of this type of pump to lift water to cover the suction (eye) of the impellerC. to initially unload the pump by having its head pressure equal to discharge pressureD. in order to overcome the potential energy of water in the discharge line1165. Which of the listed conditions can lead to cavitation in a centrifugal pump? A. Vapor pockets formed in the suction flow stream B. Rough easing volute surfacesC. Worn wearing ringsD. Heavy fluid in theflow stream1166. What is a function of the wearing rings used in most centrifugal pumps?A. Absorb erosion of high velocity discharge stream.B. Seal pump shaft against entry of air.C. Isolate the discharge side from the suction side.D. Dampen the turbulent discharge flow.1167. In a radial piston pump, reversal and control of fluid flow are accomplished by moving the _____.A. central valveB. radial plungerC. floating ringD. cylinder body 1168. To maintain design discharge pressure from a centrifugal pump, the design clearance must be maintained between the_____.A. shaft and impellerB. motor and pump shaftC. casing and impeller wearing ringsD. lantern ring and impeller1169. If a radial piston hydraulic pump fails to deliver rated fluid volume, the cause can be _____.A. contaminated fluidB. pitted thrust ringsC. worn pintle bearingsD. obstructed suctions passage1170. With respect to centrifugal pump impellers, which of the following descriptions represents the correct centrifugal pump classification?A. Single stage or multistage.B. High pressure or low pressure.C. Open or close coupled.D. Horizontal or vertical.1171. The static suction lift of a pump is the difference in elevation between the_____.A. centerline of the pump and the level of the liquid in the suction well when the source of liquid is below the pumpB. centerline of the pump and the suction liquid level when the source of liquid is above the pumpC. centerline of the pump and the level of the discharge liquidD. liquid levels of the suction and discharge1172. The usual number of single-acting pistons used in a variable stroke axial-piston pump is_____.A. 3 or 5B. 5 or 7C. 7 or 9D. 9 or 111173. An axial piston pump differs from a radial piston pump as the pistons of an axial piston pump are positioned_____.A. radially from the shaftB. parallel to each other and to the shaftC. parallel to each other but at a right angle to the shaftD. at an angle to each other and to the shaft1174. Why are removable sleeves installed on centrifugal pump shafts?A. They make it easier to replace the pump shaft packing.B. They can be economically replaced as they wear out.\C. They can be removed when it is necessary to lighten the weight of the pump.D. They increase the strength of the shaft.1175. Which of the following statements represents the advantage of rotary pumps as compared to reciprocating pumps?A. The high discharge pressure of the rotary pumps permits a larger volume of fluid per unit time than the reciprocating pump.B. Rotary pumps are capable of pumping more fluid than reciprocating pumps of the same weight.C. Rotary pumps occupy only one-half the space of reciprocating pumps.D. Rotary pumps eliminate discharge slippage of the pumped liquid, while this does not hold true for a reciprocating pump.1176. Increasing the speed of a rotary pump above its rated speed will result in which of the following conditions to occur?A. Loss of suctionB. Increased clearancesC. Decreased clearancesD. Decreased slippage1177. One of the main differences between the various types of screw pumps is in the _____.A. stuffing box diameterB. direction of rotation of the screwsC. pitch of the screwsD. type of driving gears1178. A distinguishing feature of an eductor(喷射器), when compared to other pumps, is the _____.A. discharge end being smaller than the suction endB. small size of impellerC. lack of moving partsD. ease at which the wearing rings may be changed1179. Which features of a centrifugal pump reduce the need for renewing worn impellers and pump casings?A. Close radial clearance between impeller hub and casing.B. Low rotational speed of impeller.C. Removable end plate.D. Replaceable impeller and casing wearing rings.1180. A centrifugal pump may fail to deliver water when first started if the_____. A. water seal pipe is plugged B. pump is not primedC. seal ring is improperly locatedD. impeller is flooded1181. Which of the devices listed is common to all types of pumps?A. A power end and fluid end.B. A propeller and educator.C. A volute and impeller.D. A turbine and piston.1182. If a centrifugal pump vibrates and is noisy when operating, the cause could be_____.A. worn gland sealing shaftB. worn wearing ringsC. a bent shaftD. reversed pump coupling1183. If the capacity of a centrifugal pump decreases gradually over a long period of time, you should replace the_____.A. packing glandB. mechanical sealsC. lantern ringsD. wearing rings 1184. To absorb the wear resulting from impeller rotation and abrasives in the liquid, a centrifugal pump is usually fitted with_____.A. lantern ringsB. bearingsC. easing volutesD. wearing rings 1185. If a centrifugal pump is driven by a constant speed electric motor and produces a discharge pressure less than designed, the cause is probably_____.A. excessive pump speedB. excessive suction headC. worn wearing ringsD. gross pump misalignment1186. The packing installed in the pump stuffing box is lubricated by_____.A. gravity and feed oil cupsB. grease cupsC. hand during installationD. leakage through the stuffing box 1187. If you were operating a centrifugal water service pump with worn wearing rings , the_____.A. pump would be very noisyB. pump would vibrate excessivelyC. pump would develop insufficient flowD. stuffing box would leak excessively1188. One of the main functions of wearing rings, as used in a centrifugal pumps, is to_____.A. maintain radial alignment between the pump impeller and casingB. absorb all impeller shaft end thrustC. prevent water leakage to the atmosphereD. prevent wear of the pump casing and/or impeller1189. After installing a new hydraulic pump in a system, what special attention should be given to the hydraulic system?A. The relief valves in the system should be readjusted.B. The filters and strainers should be checked frequently.C. All system pressure should be readjusted.D. The system should be drained and renewed with a fluid of different operating characteristics.1190. Which of the following is operated from the main engine room console on anautomated vessel?A. Fire pump and lube oil pumpB. Lube oil pump and distilling plantC. Distilling plant and shaft alley doorD. Shaft alley door and fixed CO2 release1191. Which of the following terms is used to identify the pressure of the liquid entering a pump?A. Suction headB. Pump headC. Discharge headD. Total head 1192. If the discharge valve is closed before the drive motor is stopped, which of the following types of pumps will most likely be damaged?A. CentrifugalB. GearC. PropellerD. Turbine1193. Which of the following statements is/are true regarding hydraulic pumps in general?A. Variable volumes can be obtained with gear pumps only by variation of the pump drive speed.B. A radial piston pump houses sliding pistons in a stationary cylinder block through which passes a rotating pintle or ported shaft.C. The amount of fluid displaced per revolution of an axial piston rotary pump is dependent on the angle formed between the cylinder block and valve plate.D. All of the above.1194. The delivery rate of a variable stroke axial piston hydraulic pump is controlled by varying the position of the_____.A. slide blockB. tilting boxC. pintleD. reaction ring1195. The pressure of a liquid leaving the pump can be referred to as the_____.A. total headB. discharge headC. net positive suction headD. suction head1196. Air leakage between the shaft and stuffing box packing in a centrifugal pump is prevented by_____.A. a compressed packing glandB. lantern tings between the packing ringsC. a liquid sealD. the stuffing box gland1197. The suction - force principle of operation is a typical characteristic of_____. A. centrifugal pumps B. jet pumps C. propeller pumps D. reciprocating pumps1198. Hydraulic pumps most commonly used in steering systems are of the_____. A. lobe type B. screw type C. axial piston type D. volute type1199. An axial piston, variable stroke pump is used in a vessel's hydraulic steeringgear. Under pressure, oil continually leaks out from between the valve plate/cylinder barrel and will _____.A. cause loss of hydraulic oil from the systemB. result in extreme damage to the pumpC. cause damage to the pump ff not continually drained from the pump casingD. result in the system high side pressure to substantially drop off1200. A centrifugal pump vibrates excessively during operation. Upon disassembling the pump it is found that the impeller is out of balance. Without an available spare, you should_____.A. drill holes through the heavy side of the impeller until it balancesB. weld counterweights to the light side of the impellerC. remove metal from the heavy side by machining in a latheD. acid wash and serape the heavy side until it balances1201. An increase in rotor clearances in a rotary pump will_____.A. increase discharge pressureB. decrease pump capacityC. decrease pump cavitation,D. decrease reaction ring clearance1202. The internal force of a material, which tends to resist deformation when subjected to external forces, is known as_____.A. stressB. strainC. shear strengthD. ultimate tensile strength 1203. In an electro-hydraulic steering system, under movement is maintained in close synchronization with the steering wheel position by means of the_____.A. trick-wheelB. follow-up controlC. six-way valveD. Rapson slide1204. Crankcase sweating in a refrigeration system is caused by_____.A. a stuck solenoid valveB. a shortage of refrigerantC. too much oil in circulationD. too much superheat1205. If a refrigeration system compressor crankcase is sweating, you should_____.A. add refrigerant to the systemB. adjust the thermal expansion valve to the proper settingC. adjust the float valve to the proper holding pressureD. open the hand expansion valve1206. A multistage centrifugal pump can be BEST described as having_____.A. two or more impellers housed together in one casing and mounted on a single shaftB. a single stepped impeller mounted in a progressively staged casingC. a large radial clearance between the impeller and casing to prevent overheating due to friction。

轮机英语三管轮试题分油机.docx

Lesson 171682.Emulsification of oil will occur when mixed withA.airB. black oilC. waterD. ice cream1683.A centrifuge arranged to separate two liquids is known as ____ •A.an oily water separatorB. a purifierC. a centrifugal compressorD. a clarifier 1684.A centrifuge arranged to separate impurities and small amounts of water from oil is known as ____ .A.an oily water separator B・ a purifierC・ a centrifugal compressor D. a clarifier1685.When a clarifier is running the impurities and water collect at the bowl ___ .A.centerB. peripheryC. inletD. upper parts1686.For many years marine centrifuges were designed for _____ o peration, that is the machines were run for a period during which solids accumulated in the bowl. The machine was stopped when the accumulated solids began to impair its performance ・A.purifying B. batch C. long period D. temporary1687.For a purifier, changing to a gravity disc with larger hole diameter will move the interface towards the ____ ・A.bowl peripheryB. bowl centerC. upper surfaceD. lower surface1688.For a purifier changing to a gravity disc with smaller hole diameter will move the interface towards the ____ •A. bowl peripheryB. bowl centerC. upper surfaceD. lower surface1689.The ____ of the gravity disc is too big. It cause oil to flow through the water outlet. We changed the disc and no oil is found in the water outlet.A. gravityB. diameterC. circumferenceD. cylinder1690.Dirty oil must be ___ before being used again •A. mixed with clean oilB. purifiedC. heatedD. strained1691.Which of the following influences the position of the interface between the liquid seal and the oil in a purifier?A. Height of the machine B・ Temperature of the liquid sealC. Gravity discD. Bowl diameter1692.For a L.O. purifier, if the back pressure of the oil outlet is too high, the interface between oil and water in the bowl will ____ ・A. be interruptedB. move downwardsC. move outwardsD. retain original position1693.When in operation, it is unavoidable that a small amount of oil _____ throughleakage, and in order to compensate for these leaks the system is connected to a feed pump.A. escapesB. overheatsC. expandsD. accelerates1694.Coalescence is the breakdown of surface tension between oil droplets in an oil/water mixture, which causes them to join and ____ in size.A. expandB. extract C・ increase D. decrease1695.When a centrifuge is arranged to separate impurities and small amount of water from oil, it is known as a ___ •A. purifierB. separatorC. filterD. clarifier1696. ____ is arranged for cleaning the lubricating oil in the system and clean oil can be provided from a storage tank.A. A filterB. A centrifugeC. A distillerD. A generator1697.In a purifier, the interface between the liquid seal and the oil should be positioned as close as possible to ____ •A. the outlet of oilB. the outlet of waterC・ the bowl periphery D. the center of bowl1698・__ is the breakdown of surface tension between oil droplets in an oil water mixture which causes them to join and increase in size.A. WearB. ContaminatingC. CoalescenceD. Coarse separating1699.The position of the interface between oil and water within the centrifuge is achieved by the use of ____ .A. gravity discB. centrifugal bowlC. a stack of discsD. main sealing ring1700.To start the ejection process the oil feed to the centrifuge is first shut off and the oil remaining in the bowl removed by admitting ____ •A. flashing waterB. operating oilC. flushing waterD. sealing water1701.The interface between the liquid seal (water) and the oil should be positioned ____ possible to the bowl periphery.A. as far asB. as soon asC. as close asD. as closer as1702.What is used to purify water and foreign matters from the fuel oil in the following?A. CompressorB. Separator C・ Evaporator D. Fuel pump1703.They understand the ____ of automatic sludge discharging of the purifie匚But they are not good in practice.A. principleB. principalC. theoryD. case1704.The diameter of the gravity disc is too big. It causes oil to flow through the water outlet. We changed the disc and no ____ is found in the water outlet.A. waterB. oilC. scaleD. ridge1705.If oil density were greater than water1 s，the oil separator ___ •A. did workB. would work wellC. didnt workD. wouldn't work1706.Sediment collects in a tubular purifier ____ .A. on top coverB. on sides of bowlC. in drain line on the discsD. on the discs1707.. Both fuel oils and lubricating oils require_______________ b efore passing to the engine.A. treatmentB. heatingC. coolingD. boiling 1708.The treatment of the fuel oils involves storage, heating, filtering andA. centrifugingB. pressurizing C・ atomization D. igniting 1709. __________ is used to separate two liquids or a liquid and solids as in contaminated oil.A. Oily-water separatorB. PurifierC. Clarifier D・ Centrifuge1710・ Where a centrifuge is arranged to separate two liquids, it is known as aA. purifierB. clarifierC. liquid-separatorD. oily-water separator1711.Where a centrifuge is arranged to separate impurities and small amounts of water from oil it is known as a ____________ ・A. A. Oily-water separatorB. PurifierC. ClarifierD. Centrifuge1712.u A centrifuge consists of an electric motor driving a vertical shaft on the top of which is mounted the bowl assembly. ” According to this sentence, we can know that ____________ i s mounted on the top of the vertical shaft.A. a centrifugeB. an electric motorC. a bowl assemblyD. a driving motor1713.A centrifuge of which the bowl is arranged as the upper and lower parts separate discharges the sludge ____________ .A.by opening the separator manuallyB.by separating the lower part from the upper part automaticallyC.by separating the upper part from the lower part automaticallyD. continuously1714・ Before the in a purifier is ejected, ____________ .A.the oil feeding is stopped and replaced by admitting flushing water.B.the flushing water feeding is stopped and replaced by admitting oil.C.the feeding of dirty oil and flushing water is stopped.D.the feeding of dirty oil and flushing water is admitted.1715. Main engines as well as auxiliary engines operating on heave fuel should have continuous ______ o n the lubricating oil, either according to the bypass or batch principles.A. filteringB. centrifugingC. depositing D・ operating1716・ Modern centrifuge designs enable continuous over a considerable period of time. This is achieved by ____ which is timed to discharge the sludge at regular intervals.A. an injection processB. an ejection processC. a separation process D・ a heating process1717.When two oil separators are working in series, they should work with _A. both as clarifiersB. first one as clarifier, second one as purifierC. both as purifiersD. first one as purifier, second one as clarifier1718.One of the reasons that cause oil flowed from sludge outlet of a self -cleaning separator is ___ .A.seal water supply be cut offB.make up water supply be cut offC.oil outlet valve closed or not open sufficientlyD.the flow rate of oily water is too much1719.When separating lube oil in oil separator, the optimal separating quantity is —of the rated quantity on name plateA. 100%B. 1/2C. 1/5D. 1/31720.When separating fuel oil in oil separator, the separating quantity is ____ of the rated quantityA. 100%B. 80%C. 1/2D. 1/31721.The separating effect of oil separator is not good, the reason may be _A.too little seal waterB.improper gravity discC.oil discharging pump not working very wellD.low water level of the working water1722.When separating the lube oil without additive, it is usually cleaned with hot water .the aim is to remove _from itA. acidB. sludgeC. mechanical impurityD. salinity1723.When finish working on the oil separator, you should __ firstlyA. cut off the powerB. cut off the oil inletC・ open guide water valve D. close oil outlet valve1724.To ensure oil separator working in normal condition, the interval between two sludge dischargings should not exceed ___A. 2hB. 4hC. 5hD. 6h1725. ______ c an cause oil flow from water outlet of a separatorA. oil inlet valve opening too quicklyB. oil temperature too highC. diameter of gravity disc too smallD. viscosity of oil too low1726. ___ can not cause oil flow from water outlet of self cleaning separatorA. oil temperature too highB. diameter of gravity disc too largeC. oil temperature too lowD. high level tank out of water1727. ___ can cause oil flow from sludge outlet of self cleaning separatorA. too much sludge accumulated in separator bowlB. diameter of gravity disc too largeC・ high level tank lack of water D. oil input too rapidly 1728・______ are required to remove small quantities of water from a much larger amount of oil. Additionally it must separate solids.A. Incinerators B • CentrifugesC. Oily water separatorsD. Incinerator1729・ On board supply vessels, a centrifuge is normally used to purifyA. cooling waterB. fuel oilC. sea waterD. diesel intake air1730.For optimum results, centrifugal purification of heavy fuel oil should be accomplished with the fuel at the lowest practicable ________ .A. throughputB. additive percentC. cetane numberD. TBN number1731.Heavy residual fuel oils are heated prior to centrifuging to __________ .A. reduce fuel weightB.increase specific gravityC.separate fuel from lube oilD.reduce fuel viscosity1732.In a disk-type lubricating oil purifier, __________________ .A.the purifier driving gears are lubricated by the reclaimed・B.oil as it leaves the bowl all dirt and sludge are automatically discharged with the cooling water.C.sealing water must never be supplied until after oil is fed to the unit.D.deterioration of the bowl ring gasket will cause the purifier to lose its water seal. 1733.The size of the discharge ring used for the efficient operation of a disk type purifier is dependent upon the ______ .A.rated capacity of that purifierB.viscosity of the oil being purifiedC.maximum design speed of that purifierD・ specific gravity of the oil being purified1734.One engine manufacturer recommends heavy fuel oil should not be heated above 80°C to 95°C (176°F to 203°F) before purification. This upper limit should beobserved to ensure against _______________ ・A. flattening of the bowl neoprene O-ringsB. operation within the explosive range of the fuelC. excessive purifier operating pressuresD. excessive oil viscosity。

2024三管轮理论英语考试真题

2024三管轮理论英语考试真题2024 Three-Tube Wheel Theory English ExamInstructions:This exam is designed to test your understanding of the Three-Tube Wheel Theory, a scientific concept proposed by Dr. John Smith in 2020. Please carefully read the questions and provide detailed answers.Section 1: Multiple Choice (1 mark each)1. According to the Three-Tube Wheel Theory, what is the function of Tube 1?a) Regulating temperatureb) Controlling speedc) Providing stabilityd) Generating power2. Which of the following best describes the relationship between Tube 2 and Tube 3 in the Three-Tube Wheel Theory?a) Tube 2 is dependent on Tube 3b) Tube 3 is dependent on Tube 2c) Tube 2 and Tube 3 are interdependentd) Tube 2 and Tube 3 are unrelated3. In the Three-Tube Wheel Theory, what is the significance of the direction of rotation?a) Determines the efficiency of energy transferb) Indicates the level of frictionc) Controls the speed of the wheeld) Affects the stability of the systemSection 2: Short Answer (2 marks each)4. Explain how Tube 1 contributes to the overall functioning of the Three-Tube Wheel Theory.5. Describe a real-world application of the Three-Tube Wheel Theory and how it can benefit society.6. Discuss the potential limitations or challenges of implementing the Three-Tube Wheel Theory in practical systems.Section 3: Essay (10 marks)7. Dr. John Smith's Three-Tube Wheel Theory has been met with both praise and skepticism since its introduction in 2020. In your opinion, what are the key strengths and weaknesses of thistheory? How do you think it can impact future technologies and advancements in science?Good luck with your exam!。

轮机英语三管轮试题---油水分离器

1591. Oil water separators are used to ensure that ships don't discharge oil when pumping out _____.A. ballast waterB. boiler waterC. bilge waterD. sewage water 1592. The bilge main is arranged to drain any watertight compartment _____ ballast, oil or Water tanks and to discharge the contents overboard.A. rather thanB. other thanC. in addition thatD. except for 1593. Emulsification of oil will occur when mixed with _______.A. airB. black oilC. waterD. ice cream1594. In an oily water separator the oil will travel _____ to the oil collecting spaces.A. upwardsB. downwardsC. outwardsD. forwards1595. When started, a complete oily water separating unit is first filled _____. The oily water mixture is then pumped through the inlet pipe into the coarse separating compartment.A. with dirty waterB. with clean waterC. by oily waterD. by mixed water 1596. A high rate of separation between oil and water is favored by _____.A. large size of oil globuleB. low temperatureC. high viscosityD. high flow rate1597. If a bilge pump failed to build up discharge pressure, you should check for _____.A. excessive water in the bilgesB. a clogged suction strainerC. oil in the bilgesD. All of the above1598. The emergency bilge suction or bilge injection valve is used to prevent _____ of the ship.A. proceedingB. overloadingC. collisionD. flooding1599. All bilge suctions must be fitted with suitable _____, which in the machinery space would be mud boxes positioned at floor plate level for easy access.A. strangersB. relief valvesC. emergency valvesD. strainers1600. Coalescence is the breakdown of surface tension between oil droplets in an oil/water mixture, which causes them to join and _____ in size.A. expandB. extractC. increaseD. decrease1601. In a complete oil/water separator, more oil will separate out onto the underside of these plates and travel outwards until it is flee to rise into the oil collecting space. What's the meaning of "it" in the sentence above?A. a separatorB. oilC. waterD. an oil collecting space1602. Oil water separators are used to ensure that ships don't discharge oil when_____ bilge water.A. to pump offB. being pumpedC. pumping outD. it pumping out1603. _____ is the breakdown of surface tension between oil droplets in an oil water mixture which causes them to join and increase in size.A. WearB. ContaminatingC. CoalescenceD. Coarse separating 1604. Here some oil in the oily water separator, as a result of its lower _____, will separate and rise into the oil collection space.A. temperatureB. viscosityC. densityD. velocity1605. All bilge suction must be fitted with suitable _____, which in the machinery space would be mud boxes positioned at floor-plate level for easy access.A. strainersB. valvesC. elementsD. separators1606. The oil _____ in the discharging water from oil water separator exceeds 15 PPM without alarm, because the coil was burnt out.A. filterB. holeC. pollutionD. content1607. The remaining oil/water mixture now flows down into the fine separating compartment and moves slowly between the _____ in the Turbulo separator.A. catch platesB. swash platesC. cover platesD. bedplates1608. An oil water monitor is required in order to measure _____.A. the oil content in waterB. the water content in fuel oilC. the water level in bilge wellD. the oil level in bilge well1609. The bilge main is arranged to drain any watertight compartment _____ ballast, oil or water tanks and to discharge the contents overboard.A. more thanB. other thanC. in addition toD. except for1610. Oil water separators are used to ensure that ships don't discharge oil when pumping out _____.A. ballast waterB. boiler waterC. bilge waterD. sewage water1611. Where an excessive level of contamination is detected an alarm is sounded and diverting valves are operated. The discharging liquid is then passed to _____.A. overboardB. a bilge wellC. a slop tankD. a hot well1612. If a bilge pump failed to build up discharge pressure, you should check for _____.A. excessive water in the bilgesB. a clogged suction strainerC. oil in the bilgesD. a closed skin valve1613. The emergency bilge suction valve is typically used _____.A. to inject cleaning additives when the bilges are extremely dirtyB. when the main condenser becomes fouled, in order to provide additional cooling water circulationC. to connect the rose box to the independent bilge suctionD. if the bilges become flooded and they can not be emptied by any other means 1614. A centrifugal bilge pump requires priming _____.A. primarily to lubricate the shaft sealsB. due to the inability of this type of pump to lift water to cover the suction (eye) of the impellerC. to initially unload the pump by having its head pressure equal to discharge pressureD. in order to overcome the potential energy of water in the discharge line1615. The ability of an oil to separate cleanly from an oil and water mixture is referred to as its _____.A. precipitation numberB. neutralizationC. pour pointD. demulsibility1616. The bilge system has been performing well; however, the aft starboard engine room bilge well suddenly fails to be pumped out. Which of the following should be done first to determine the cause?A. Open the bilge pump for inspection.B. Remove each of the manifold valves.C. Remove only the manifold valve to the affected bilge-well.D. Attempt to pump out another bilge well to determine if the entire system is affected.1617. Which pump installation would require an external source of sealing water?A. Main circulator pump jacket water cooling.B. Salt water service pump.C. Auxiliary condensate pump.D. Bilge pump.1618. One of the consequences in continuing to operate a centrifugal bilge pump with the discharge valve closed, is that the _____.A. motor overload will openB. relief valve will openC. pump will overheatD. motor will overheat1619. If an operating bilge pump is developing good vacuum, but is unable to discharge any water, which of the following problems is the most probable cause?A. The wearing rings are excessively worn.B. The suction strainer is clogged.C. The discharge valve is clogged.D. The shaft is worn.1620. If a bilge pump is able to develop vacuum, but is unable to sufficiently pump out the bilges, you would check for all of the following EXCEPT_____.A. the circuit breakerB. for leaks in the suction pipingC. relief valve .is not properly seatedD. the suction strainer1621. An independent bilge suction is required for _____.A. ballast tanksB. sludge tanksC. machinery space bilgesD. cargo hold bilges1622. If a centrifugal bilge pump were continually operated with the discharge valve closed the _____.A. motor overload would openB. relief valve would openC. pump would eventually overheatD. motor would overheat1623. To thoroughly pump out the bilges using a horizontally mounted centrifugal pump, the _____.A. pump must always be primedB. volute must impart a radial and rotary motion of the water suction sideC. connection must guide the liquid to the lantern ringsD. stuffing box should not be allowed any water leakage1624. Bilges may be pumped _____.A. on the outgoing tideB. overboard after darkC. overboard through an oily water separatorD. anytime in an emergency, i.e. main engine lube oil failure1625. If it becomes necessary to pump bilges while a vessel is in port, which of the following procedures should be followed?A. Pump only if the discharge is led to a shore tank or barge.B. Pump only during the hours of darkness.C. Pump only on the outgoing tide.D. Pump only as much as is necessary. 1626. A new ocean going ship of 2000 gross tons having an inoperative oily water separator may dispose of its bilge slops by _____.A. holding its slops onboard until they can be pumped into the city sewer systemB. circulating them through the lube oil purifier to remove water and debrisC. holding its slops onboard until they can be discharged to a shore side reception facilityD. pumping them into a settling tank for separation before pumping the oily water residue overboard1627. An oceangoing ship of 400 gross tons and above must be fitted with a standard discharge shore connection. What is the size of the bolt circle diameter of the shore connection required to transfer oily ballast to a shore side reception facility?A. 125 mmB. 183 mmC. 215 mmD. It depends on outside pipe diameter.1628. Which of the following liquids can ordinarily be discharged overboard without being processed through an oily water separator?A. Cargo tank ballast.B. Segregated ballast.C. Engine room bilges.D. Cargo pump room bilges.1629. The minimum number and capacity of bilge pumps and fire pumps and their dispersement within the ship is governed by _____.A. Classification Society RulesB. National requirementsC. The IMO International Convention for the Safety of Life at SeaD. All of the above1630. The principle of separation by which all commercially available oily water separators function is _____ differential between oil and water.A. the temperatureB. the viscosityC. the gravityD. the size1631. The resistance to the movement of the globule in oily water mixture depends on its size and the _____ of the fluid.A. pressureB. velocityC. gravityD. viscosity1632. Placing a filter on the _____ of an oily water separator will "polish" the discharge but overloading must be avoided.A. suction sideB. discharge sideC. by-pass pipeD. sampling pipe 1633. The most suitable pump for oily water separator feed duties is_____.A. a reciprocating pumpB. a vane pumpC. a centrifugal pumpD. a triple screw pump1634. To assist separation of low viscosity oils steam coils or electric heaters are fitted ______ of the oily water separator.A. in entranceB. in exitC. in the upper partD. on the outside1635. Which one of the following is not generally recognized as one constitute of bilge water? ______________.A. Oil leaking from tanks inside engine roomB. Engine room cleaning waterC. Water leaking from the separator sludge tankD. Sewage water1636. When bilge water is heated in a holding tank, which one of the following statements is not accurate? ____________.A. The high temperature facilitates primary gravity separationB. Most of the oil and organic solvents are raised to the top layerC. The high the temperature is, the more the top oil will be collectedD. The high temperature has little use on the separation of emulsified oil1637. When discharging bilge water, which criteria must be observed? _____________.A. The requirement for the oil content of bilge water discharged is 15 ppmB. No discharge in sensitive watersC. Any discharge in sensitive watersD. International, national or local requirements have to be observed1638. Which of the following methods might be used as the treatment on emulsified oil? ___________.A. gravity separationB. centrifugeC. CycloneD. Cross-flow membrane filtration1639. What’s the advantage of oily water separator that meets the requirement of MEPC 60(33) over MEPC 107(49)?A. more economicB. larger capacity on oil treatmentC. less costiveD. more capable of separating emulsified oil1640. Which of the following methods might favor oil emulsion in bilge water?A. Raising temperatureB. less use of surfactantC. more use of solventD. polishing device fouling prevention1641. Which of the following methods can remove the non-separable emulsified oil in bilge water?A. gravity separationB. use of adsorbentsC. use of flocculentsD. use of chemical addition1642. Accidental flooding of the engine room bilges by the bilge main is prevented by _____.A stop-check valves installed in the bilge suction manifoldsB using a positive displacement reciprocating bilge pumpC installing eductors in all bilge rose boxesD installing a swing check before each bilge valve。

轮机英语三管轮试题造水机

Lesson191735. _____ is the production of pure water from sea water by evaporation and re-condensing.A. EvaporationB. CirculationC. CondensationD. Distillation1736. When a vacuum boiling evaporator works, the hot jacket water will pass over the tube stack and_____ the sea water passing through the tubes.A. disposeB. dissolveC. heatD. dissipates1737. With a vacuum boiling evaporator, the remainder of sea water fed to the evaporator is pumped out by_____.A. a brine pumpB. an air ejectorC. a feed pumpD. distillate pump 1738. In a vacuum boiling evaporator, the fresh water generated is pumped out by_____.A. a brine pumpB. an air ejectorC. a feed water pumpD. a condensate pump1739. When distilling sea water the cooling water discharging from the distiller is fed back to evaporator as feed water_____.A. to decrease scale formationB. for better cooling effectC. for more economical purposeD. to raise vacuum1740. When distilling salt water the cooling water discharging from the distiller is fed back to evaporator as feed water_____.A. to cut down the amount of cooling water neededB. to prevent an excess amount of cooling water from being discharged to the bilgesC. to supply hot water to the evaporator for more economical operationD. None of the above is tree.1741. The process during which liquid containing a reasonable amount of sensible heat at a particular pressure immediately changes into steam after admitted to a chamber at a lower pressure is called_____.A. boiling offB. flash evaporationC. condensationD. none of the above 1742. In the process of_____, liquid changes into gas.A. evaporationB. frostingC. condensingD. compressing 1743. Which of the following is NOT on the list items to be recorded in Oil Record Book Part I (machinery space operation)?A. Accidental discharge of oil.B. Disposal of oil residues.C. Quantity of water produced by F. W. G.D. Discharge of dirty ballast or cleaning water from fuel oil tanks.1744. When the water produced from most evaporator is supplied for drinkingpurpose, it must be treated to ensure it is biologically pure and_____.A. slightly acidicB. slightly alkalineC. no saltyD. slightly bitter 1745. _____ provides the head or pressure to supply the domestic water where required.A. The compressed airB. The compressing airC. The transfer pumpD. The head tank1746. _____ is used for washing and drinking.A. The ballast systemB. The salt water systemC. The bilge systemD. The domestic system1747. Water evaporates or steam condenses at the saturation temperature, which depends upon the pressure, the higher the pressure_____ the saturation temperature.A. the moreB. the higherC. the lowerD. the highest1748. We use_____ to distill fresh water from sea water.A. engineB. sea water pumpC. cylinder coolerD. fresh water generator1749. Because of the reduced_____ in the vacuum boiling evaporator, some of the sea water boils as it flows through the tubes.A. temperatureB. water levelC. pressureD. rate of flow1750. The fresh water generator produces fresh water_____.A. by cooling sea waterB. by heating sea waterC. by evaporation of sea waterD. by purifying sea water1751. Clean oil is achieved in a clarifier bowl where the impurities and water collect at the bowl_____.A. bottomB. topC. centerD. periphery1752. The designed capacity is 25 tons a day, but the fresh water generator can only_____ 22 tons at present.A. consumeB. distillC. runD. operate 1753. More than one stage of evaporation can take place by admitting the sea water into chambers with progressively_____ pressure in the flash evaporator.A. lowerB. higherC. the lowerD. the higher 1754. Because of the reduced_____ in the distillation system, some of the sea water boils as it flows through the tubes of the evaporator.A. pressureB. temperatureC. densityD. volume 1755. In_____, hot diesel engine jacket water passes over the stack and heats the sea water passing through the tubes.A. a flash generatorB. a flash evaporatorC. a vacuum boiling evaporatorD. a boiler1756. Which of the following statements is true concerning any evaporator?A. High conductivity of the distillate indicates distillate salinity is excessive.B. Increasing the absolute pressure of the shell will increase the distiller's capacity.C. Mesh separators are used in evaporators to filter the distillate.D. Reducing the brine density will reduce the heat lost overboard.1757. The process of boiling seawater in order to separate it into freshwater vapor and brine is usually defined as_____.A. dehydrationB. condensationC. evaporationD. dissolution1758. When a flash-type evaporator is to be secured for an extended period of time, the entire unit should be drained, cleaned, and_____.A. completely filled with saltwaterB. filled with de-scaling compoundC. tightly closed to exclude airD. vented to the atmosphere1759. Which of the following descriptions best identifies the operating principal of a flash-type evaporator?A. Sea water is heated to boiling temperature while under a vacuum.B. Sea water is passed over heated plates in a thin film.C. Heated sea water is injected into a vacuum chamber.D. Sea water is forced through a heated eductor.1760. Which of the listed problems could produce a high absolute pressure within a flash type evaporator?A. Production of high salinity distillate .B. Seawater feed temperature below 165oC.C. A leak in the first stage demister .D. A cracked distillate pump vent line.1761. Distilled water from an evaporator may be discharged into a potable water(饮用水)tank _____.A. through a detachable hose connectionB. after passing through an activated charcoal filterC. after chemical analysis shows it is fit for consumptionD. through a solenoid operated three-way valve1762. Which of the following statements is correct relative to distillation plant operation?A. Distillation is the process of boiling seawater to produce vapor which is condensed into fresh water.B. Evaporation is the second part of the distillation process where brine is removed.C. Brine is the result of condensed sea water vapor.D. Distillate is the product resulting from the evaporation of fresh water vapor. 1763. Brine density in a distilling plant is measured with a/an_____.A. psychrometerB. salinometerC. anemometerD. sphygmomanometer1764. Tube leaks in the distillate cooler of a two stage flash evaporator will result in_____.A. loss of second stage vacuumB. contamination of the distillateC. lower feed inlet temperatureD. contamination of the second stage condenser1765. Why will a two stage flash type distilling plant tend to operate more efficiently when operating in cold seawater?A. The colder seawater passing through the condenser tube bundles of the various stages increases evaporator vacuum.B. The amount of heated feed water discharged from the feed water heater after condenser is increased.C. Fewer non-condensable gases are created by the flow of colder seawater.D. More seawater is allowed to pass through the flint stage overflow weir.1766. One distinct advantage of flash type evaporators, as compared to most other evaporators, is that in a flash evaporator_____.A. high temperature distillate can be re- circulated to induce additional flashingB. scale formation is not a severe problemC. cold shocking is more effective in removing scaleD. water purity is greatly increased at high capacity1767. Less scale formation occurs in a flash evaporator than in a submerged tube evaporator because_____.A. the distillate produced has greater purityB. no boiling occurs on heat transfer surfacesC. evaporation occurs at a higher rateD. the incoming feed is at a higher temperature1768. The primary reason low pressure evaporators produce distillate more efficiently, and with less scale formation, than high pressure evaporators is_____.A. evaporation is accomplished in a vacuumB. due to the higher temperature of the incoming feedC. due to the latent heat of evaporation principleD. evaporation in a submerged medium produces more distillate1769. A vacuum is initially created in a flash type distilling plant by_____.A. the flashing of the feed waterB. the condensation of the saltwater feedC. air ejectors, eductors, or a separate vacuum pumpD. condensation of the distillate1770. Scale accumulation on evaporator heat exchange surfaces_____.A. increases brine densityB. increases distillate salinityC. reduces metal corrosionD. reduces heat transfer1771. Excessive scale formation in a distilling plant may result from_____.A. poor distillate qualityB. reduced evaporator capacityC. low brine concentrationD. improper vacuum regulation1772. Which of the listed conditions will cause the feed water, that has not flashed to vapor in the first-stage of a flash evaporator, to flow into the second-stage?A. Gravity siphon effect.B. Higher vacuum in the second-stage.C. Difference in brine density between first and second stages.D. lower pressure in first-stage.1773. The vacuum maintained in the salt water feed heater shell of a flash-type evaporator is generally accomplished by_____.A. a separate air ejector unitB. a direct unimpeded connection between second stage and salt water feed heaterC. either by vacuum drag or an external line from the first stage via a fixed orificeD. the fixed orifice provided in the steam supply line1774. In which of the areas listed would you expect to find the highest salt concentration in a flash evaporator?A. Distiller air ejector cooling medium.B. Saltwater heater discharge.C. First-stage internal feed box.D. Second-stage internal feed box. 1775. On which of the following heated surfaces of a flash type evaporator would you be more likely to find soft scale formation?A. Feed-water heater internal tube surfaces.B. Internal distillate cooler tubes.C. Flash chamber vertical surfaces.D. Distilling condenser tubes. 1776. Which of the conditions listed represents the greatest effect of excess frost accumulation on the evaporator coils?A. Keeps the refrigerated space cooler.B. Reduces the efficiency of the plant.C. Takes the load off the compressor.D. Has no affect on the system.1777. Which statement concerning the collection of fresh water is FALSE?A. Fresh water may be obtained from fish.B. lifeboat covers or canopies should be washed with rain before drinking water iscollected.C. Fresh water may be collected from condensation inside the life-raft.D. Freshwater cannot be produced from standing seawater.1778. Seawater may be used for drinking water_____.A. at a maximum rate 'of two ounces per dayB. after mixing with an equal quantity of fresh waterC. if gather during or immediately after a hard rainD. under no circumstance1779. Distilled water is now largely used on board, this may be corrosive (due to presence of dissolves CO2) and_____ to the taste.A. flatB. slatC. sweetD. acid 1780.. A flash-type evaporator discharges heated seawater into a chamber that is maintained at a pressure _____________ than the vapor pressure of the entering heated seawater, and subsequently the flashed water vapor thereby produced.A. lower condensingB. higher coolingC. lower coolingD. higher condensing1781. The design of ___________for a flash type evaporator is of critical importance because it must provide an optimum feed water spray pattern that facilitates the flashing process, and it must also maintain a pressure differential between successive stages.A. condenserB. flashing deviceC. lashing deviceD. vacuum pump 1782. Which one of the following might not be employed to create vacuum for flash type evaporator__________.A. high-pressure steam-driven air-ejectorB. motor-driven vacuum pumpC. water-motivated air educatorD. centrifuge pump1783. The flash-evaporator is different with the submerged-tube evaporator in that for the former_________.A. Water is heated into vapor on heating surfacesB. Water is vaporized by pressure differenceC. There are no heating-transfer surfacesD. There are more heating-transfer surfaces1784. For a flash type evaporator, the seawater heater will have to maintain a _____enough temperature to minimize scale formation.A. lowerB. higherC. lowD. high1785. For a flash type evaporator, a demister is located ______the condenser.A. afterB. beforeC. insideD. outside1786. The efficiency and output capacity of a low pressure distilling plant will be reduced if the last effect shell ______.A pressure does not fluctuate rapidlyB pressure remains steady and unchangedC brine density does not exceed 1.5D brine density is too low1787. The heated feed water entering any flash chamber of a flash-type evaporator will ______.A vaporize, with the unflashed water remaining at the temperature at which it entered the flash chamberB vaporize, with the unflashed water equalizing to the saturation conditions existing in the flash chamberC vaporize, with the remaining water at a temperature greater than it entered the flash chamberD boil, allowing steam bubbles to rise through the brine at the bottom of the flash chamber1788. The three basic parts of any eductor are the nozzle, the suction chamber, and the _______.A injectorB compressorC diffuserD siphon1789. _______ is based upon the biological process of osmosis, which allows fluids to pass through a semi –permeable membrane.A. FlashB. Reverse osmosisC. Boiling offD. Distillation1790. The desalination of water by ______is a membrane separation process in which the water from a pressurized saline solution (seawater) is forced through a synthetic semi-permeable membrane leaving its salts behind (dissolved solids)A. distillationB. flashC. reverse osmosisD. boiling off1791. The function of the _______is to convert seawater into fresh water by vacuum distillation, for the supply of high quality fresh water for domestic and process utilization.A. oily water separatorB. incineratorC. fresh water generatorD. centrifuges1792. The efficiency of a flash type evaporator can be increased by ________A. lowering brine discharge densityB. decreasing the absolute pressure of each stageC. increasing the saltwater feed heater temperatureD. increasing the pressure at the spray pipe1793. The second stage feed water temperature and shell absolute pressure in a multistage, flash type, distilling plant is ________A. higher than the first stage feed water temperature and absolute shell pressureB. lower than the first stage feed water temperature and absolute shell pressureC. the same as the first stage feed water temperature and absolute shell pressureD. not related to the feed water temperature and absolute shell pressure1794. On a multistage flash type evaporator, the flash chamber is ________A. combined as part of the salt water feed heaterB. the open area above the brine levels in the first and second stagesC. combined as part of the distillate coolerD. another term used to describe the vapor feed heater1795. Which of the listed chemicals can be routinely used to maintain the hygienic quality of potable water?A. hydrochloric acidB. chlorineC. sulfuric acidD. zinc chromate 1796. Drops of sea water removed by demister _______in the fresh water generator.A. fall due to gravity in to the brine sumpB. fall due to gravity in to the evaporation sectionC. are removed by fresh water generatorD. are removed by sea water generator1797. The hot water in let and outlet valves in the fresh water generator should be open ____during the starting process.A. when there is minimum of 90% vacuumB. before starting the ejector pumpC. when there is a minimum of 30% vacuumD. after stop the ejector pump1798. The combined brine/air ejector in fresh water generator is supplied by _______creates a vacuum in the system in order to lower the evaporation temperature of the feed water.A. the fresh water pumpB. the feeding pumpC. the compressed air installationD. the separate vacuum pump 1799. The air valve installed on the upper part of the fresh water generator________A. should be open during vacuum creation procedureB. should be open after stopping the plantsC. should remain closed all the timeD. should remain open all the time1800. The combined brine/air ejector creates a vacuum in fresh water generator in order to_______A. increase the evaporation temperature of the feed-waterB. decrease the evaporation temperature of the feed-waterC. decrease the temperature of the feed-waterD. increase the evaporation temperature of the feed-water1801. The ejector pump used in the fresh water generator will_______A. discharge brine over waterB. supply condenser onlyC. feed the evaporatorD. circulate seawater between condenser and evaporator1802. The fresh water generator with a vacuum of _____allowing the brine to evaporate at a temperature of 40-50o C .A. 60-70%B. 40-50%C.90-95%D.20-30%1803. The vapour generated in the evaporator process through ______ in the fresh water generatorA. the condenser onlyB. the condenser and demisterC. the demister onlyD. combined brine/air ejector1804. Having reached the boiling temperature, the feed water undergoes _____in the fresh water generator.A. total evaporationB. partial evaporationC .partial condensationD. total condensation1805. The ____used in the fresh water generator extracts the produced fresh water from ten condenser and pumps the water to the fresh water tank.A. distillate pumpB. ejector pumpC. combined brine/air ejectorD. salinometer1806. The ______used in the fresh water generator is a single-stage centrifugal pump which supplies the condenser with sea water and the brine/air ejector with jet water as well as feedwater for evaporation.A. distillate pumpB. feeding pumpC. combined brine/air ejectorD. salinometer1807. Which of the following sequence is correct relative to distillation plant stopping procedures?(Ⅰ)Open the air screw on the plant;(Ⅱ)stop the ejector pump;(Ⅲ)stop the freshwater pump;(Ⅳ)stop the hot water supply to the unit.A. (Ⅲ), (Ⅱ), (Ⅰ),(Ⅳ)B.(I)(III)(IV)(II)C.(IV)(I)(III)(II)D.(IV)(III)(II)(I)1808. Which of the following sequence is correct relative to distillation plant starting procedures?(I) close the air screw on the plant and allow the water to flow through the condenser; (II) start the freshwater /distillate pump; (III) supply hot water to the plant (IV) switch on the salinometer; (V) start the ejector pump and create a vacuum of at least 90%.A. (Ⅲ), (Ⅱ), (Ⅰ),(Ⅳ),(V)B.(I)(V)(III)(IV)(II)C.(IV)(I)(III)(II) (V)D.(V)(IV)(III)(II)(I)1809. Early models of the flash-type evaporators used a separate shell-and tube heat exchanger as the air ejector condenser. More recent models use a combined air ejector condenser with the __________A. distilling condenserB. salt water feed heaterC. distillate coolerD. flash chamber1810. The demisters installed in a flash-type evaporator serve to _________A. deaerate the first effect distillateB. filter the condensed flash vaporsC. deaerate the first and second effect distillateD. remove small water droplets entrained in the flashed vapor1811. In the two stage flash distilling plant, which of the pumps listed is vented to the shell of the second stage in order to remove vapor from the pump suction?A. Condenser circulatingB. Feed-water heater drain pumpC. Distillate pumpD. Air ejector condenser drain pump 1812. In a flash type evaporator, the brine overboard pump is vented directly to the _________A. saltwater heater shellB. the condensation of the saltwater feedC. air ejectors, eductors, or a separate vacuumD. condensation of the distillate1813. One advantage of a flash distilling plant when compared to a submerged tube distiller is ____________A. greater distillate purity through high temperature evaporationB. cold shocking for scale removal is not requiredC. less internal corrosion because of lower brine densityD. less feed-water is required for equal plant capacity1814. Why will a two stage flash type distilling plant tend to operate more efficiently when operating in cold seawater?A. The colder seawater passing through the condenser tube bundles(束)of the various stages increases evaporator vacuum.B. The amount of heated feed water discharged from the feed water heater after condenser is increaseC. Fewer non-condensable gases are created by the flow of the colder seawaterD. More seawater is allowed to pass through the first stage overflow weir(溢洪堰)轮机英语1815. Under normal operating conditions, the highest temperature and pressure conditions existing in a flash-type evaporator will occur in the _________A. first stageB. second stageC. distillate coolerD. salt water feed water 1816. Condensate formed within the first-effect tube nest of a double-effect, low pressure evaporator, is removed by a ________________A. series of baffles (挡板)B. crossover (交叉) pipeC. condensate separatorD. drain pump。

三管轮轮机英语试题泵

1079. _____ at the end of the distribution pipe ensures that adequate pressure is maintained by the pump.A. A relief valveB. An alarmC. A pressure gaugeD. A non-maim valve1080. In general, _____ is suitable for delivering small quantities at high pressure. A. reciprocating pump B. gear pumpC. centrifugal pumpD. vane pump1081. The pumps employed on board ship can be divided into two main categories i.e. _____ pumps and centrifugal pumps.A. gearB. nonpositive displacementC. positive displacementD. rotary 1082. Lube oil pumps taking suction from the sump of most small marine engines are usually _____.A. of the diaphragm typeB. of the centrifugal typeC. of the positive displacement typeD. independently driven by electric motors 1083. The lube oil pump used in a diesel engine is a_____.A. volute pumpB. centrifugal pumpC. diaphragm pumpD. gear pump1084. Which of the following conditions could cause the feed pump for an auxiliary boiler to lose suction?A. Increased suction head pressure.B. Decreased feedwater temperature.C. Pump recirculating line being open too much.D. Excessive feedwater temperature.1085. A vane pump belongs to_____ according to its working principle.A. reciprocating pumpB. positive displacement pumpC. centrifugal pumpD. centripetal pump1086. Through a_____ pump, the liquid is transferred from the suction to the discharge by the mechanical variation of the volume of a chamber or chambers.A. positive displacementB. ejectorC. centrifugalD. air compressor 1087. A mono-pump is a single-screw pump. That means it consists of_____ rotor(s).A. oneB. twoC. threeD. four1088. The gear and screw pumps are classified as_____.A. variable stroke pumpsB. multistage pumpsC. positive displacement pumpsD. triple-ported pumps1089. Gear pumps are of positive displacement type pumps because they discharge a near constant amount of liquid_____ pressure.A. depending onB. in relative toC. regardless ofD. because of 1090. A gear pump belongs to_____ according to its working principle.A. reciprocating pumpsB. positive displacement pumpsC. centrifugal pumpsD. centripetal pumps1091. The pressure head of a pump is given in the unit of_____.A. kgB. MPaC. meter fluid columnD. None of the above is true. 1092. A centrifugal pump produces the required pressure energy by means of a rotating _____ provided with vanes.A. propellerB. impellerC. circumferenceD. screw1093. The discharge flow of a reciprocating pump is_____.A. steadyB. in pulsationC. continuousD. large 1094. In a_____ the center screw is driven and the outer screws idle.A. single screw pumpB. double-screw pumpC. triple screw pumpD. centripetal pump1095. A Screw pump belongs to_____ according to its working principle.A. reciprocating pumpsB. positive displacement pumpsC. centrifugal pumpsD. centripetal pumps1096. The amount of fluid delivered by a screw pump can be regulated by_____. A. throttling the pressure line B. changing the speed of the rotorC. either A or BD. None of the above is tree.1097. While flowing through the volute in a centrifugal pump, part of the_____ energy of the liquid is converted to_____ energy.A. kinetic/pressureB. kinetic/essentialC. pressure/kineticD. pressure/height1098. The amount of fluid delivered by a centrifugal pump can be regulated by_____.A. throttling the pressure lineB. changing the speed of the rotorC. either A or BD. None of the above is tree.1099. The amount of fluid delivered by a reciprocating pump can be regulated by_____.A. throttling the pressure lineB. changing the speed of the pistonC. either A or BD. None of the above is tree.1100. The amount of fluid delivered by a positive displacement pump can be regulated by_____.A. throttling the pressure lineB. changing the speed of the driving rotorC. either A or BD. None of the above is tree.1101. Which of the following pumps are self-priming, and can deal with liquid from a level below the pump? (1) reciprocating; (2) rotary; (3) centrifugal.A. (1) onlyB. (1)and (2)C. (1), (2) and (3)D.(2)and (3)1102. The amount of fluid delivered by a helical pump can be regulated by_____. A. throttling the pressure line B. changing the speed of the rotorC. either A or BD. None of the above is tree.1103. A positive displacement pump is that where the volume of the pump chamber is alternately increased to_____ and then decreased to_____.A. draw the liquid in / force the liquid outB. force the liquid out / draw the liquid inC. suction/drawD. deliver/outlet1104. Throttling in the_____ line of a centrifugal pump involves the risk of the pump cavitation.A. suctionB. exhaustC. pressureD. discharge 1105. As for a hydraulic single action vane pump, the inner wall of the stator is usually of_____ shape.A. circularB. ellipticalC. rectangularD. hexagon 1106. As for a hydraulic vane pump, which of the following is in contact with the vanes during working: (1)the rotor; (2)the pump shaft; (3)the external surface of the housing.A. (1) onlyB. (2) onlyC. (1) and (2)D. (1),(2) and (3)1107. Shaft sealing in a centrifugal pump can be effected by_____.A. the mechanical sealB. packed stuffing boxesC. either A or BD. neither A nor B1108. A reciprocating pump belongs to_____ according to its working principle. A. injector pumps B. positive displacement pumpsC. centrifugal pumpD. centripetal pumps1109. A_____ pump is that where the volume of the pump chamber is alternately increased to draw the liquid in and then decreased to force the liquid out.A. injectorB. positive displacementC. centrifugalD. centripetal1110. What is the purpose of a relief valve?A. to fill 2 tanks at the same timeB. to use pump at a higher pressureC. to return liquid to suction side if discharge valve is closedD. All of the above are true.1111.The pump discharge pressure will be considerably higher than the pressure at the_____.A. pump entry branchB. outlet pipeC. impellerD. None of the above is true.1112. Which of the following pumps belongs to centrifugal pump?A. Piston pumpB. Screw pumpC. Diffuser pumpD. Water-ring pump1113. The volute pump is one in which the impeller_____.A. discharges into a gradually widening channelB. has stationary diffuser vanesC. produces no kinetic energyD. All of the above are true.1114. In_____ pumps a closed discharge valve will cause bursting discharge pressure.A. centrifugalB. plungerC. injectorD. water1115. Which of the following pumps are self-priming, and can deal with liquid from a level below the pump; (1) ejector;(2) screw;(3) centrifugal.A. (1) onlyB. (1) and (2)C. (1),(2) and (3)D. (2) and (3)1116. The amount of fluid delivered by a gear pump can be regulated by_____.A. throttling the pressure lineB. changing the speed of the rotorC. either A or BD. None of the above is true1117. Attempts are made to eliminate axial thrust in centrifugal pump by_____.A. providing the impeller with balancing holesB. the use of symmetrical impellerC. neither A nor BD. either A or B1118. Which of the following pumps will build up a bursting pressure or stall their motors if the discharge valves are closed? (1) gear; (2) centrifugal; (3) screw.A. (1) and (2)B. (1),(2) and (3)C. (1) and (3)D. (2) and (3)1119. Which of the following operating features do displacement pumps bear if they are working under no-cavitation condition? (1) output is almost directly proportional to speed; (2) they are self-priming; (3) they will develop a discharged pressure equal to the resistance to be overcome, irrespective of speed.A. (1) and (2)B. (2) and (3)C. (1) and (3)D. (1), (2) and (3)1120. The_____ pump discharges a nearly constant amount of liquid regardless of pressure.A. mixed-flowB. axial-flowC. centrifugalD. displacement 1121. Which of the following pumps is used where a relatively high pressure and small capacity are required?A. V olute pumpB. Diffuser pumpC. Regenerative pumpD. All of the above1122. Some pumps use packing as sealing gland. The gland should be_____.A. slack enough to allow slight leakage of fluidB. slightly clockedC. brought up tight so as not to allow any leakageD. fitted with a relief valve 1123. Air chambers are usually fitted to reciprocating pumps in order to_____.A. increase discharge pressureB. increase suction vacuumC. develop pulsation flowD. keep a steady rate of flow1124. The pipe friction and the resistance will_____ as a result of an increase in the amount of fluid flowing through the system.A. reduceB. riseC. raiseD. fall1125. Which of the following will be the advantage of a centrifugal pump as compared with a reciprocating pump? (1) Its discharge is continuous; (2) It has no internal valves; (3) Upon accidental closing of discharge valve, excessive pressure will not build up.A. (1), (2)B. (2),(3)C. (1), (2), (3)D. (2) only1126. Which of the following pumps are self-priming, and can deal with liquid from a level below the pump: (1)reciprocating; (2)vane; (3) gear.A. (1) onlyB. (1) and (2)C. (2) and (3)D. (1), (2) and(3) 1127. Centrifugal pumps can be designed with a number of impellers_____ to attain a high final delivery pressure.A. in seriesB. in parallelC. either A or BD. None of the above is tree1128. With reference to an axial piston pump, which one of the following statements is true ?A. The cylindrical barrel is coupled to the motor.B. The cylindrical barrel has an odd number of bores.C. The bores end in sockets.D. The sockets fit in the swash plate.1129. With reference to a radial piston pump, which one of the following statements is false ?A. Surrounding the fixed shaft is a hollow shaft.B. This hollow shaft carries radial bores.C. Each bore is fitted with a well-lapped plunger.D. There are always even numbers of bores.1130. Under rotary pumps are the gear, _____, cam-and-piston and screw types.A. reciprocatingB. diffuserC. turbineD. vane1131. The engine fuel oil system should be primed by using_____, and the system cleared of air by means of the various air vent cocks.A. the priming pumpB. the transfer pumpC. the hydraulic pumpD. injector pump 1132. Domestic water pump is started automatically by_____ which operates as the water level falls to a predetermined level.A. a level controllerB. a temperature switchC. a pressure switchD. a floating ball 1133. The pumps employed on board ship can be divided into two main categories, i.e._____ pumps and centrifugal pumps.A. gearB. non-positive displacementC. positive displacementD. rotary 1134. Under centrifugal pumps are the volute, diffuser, mixed-flow, axial flow and_____ or regenerative types.A. reciprocatingB. hydraulicC. turbineD. vane 1135. In general, _____ is suitable for delivering small quantifies at high pressure. A. reciprocating pump B. gear pumpC. centrifugal pumpD. vane pump1136. The various pumps and lines are _____ to some extent so that each pump can act as an alternative for another.A. interlockedB. interconnectedC. interferedD. interacted 1137. _____ are more suitable for large quantities at low pressure.A. Reciprocating pumpsB. Rotary pumpsC. Centrifugal pumpsD. Gear pumps1138. Gear pumps are _____ type because they discharge a near constant amount of liquid regardless of pressure.A. positive displacementB. non-positive displacementC. mixed-flowD. axial-flow1139. Centrifugal pumps are non-positive and a fairly_____ unit.A. low pressureB. low dischargeC. low speedD. high pressure 1140. In_____ pump a closed discharge valve will not cause excessive pressure to build up.A. gearB. vaneC. screwD. centrifugal1141. Centrifugal pumps are popular because they are very simple in construction, and produce smooth, constant, _____ discharge.A. non-pulsatingB. pulsatingC. positiveD. non-positive 1142. Sealing in pump shaft is achieved by means of the_____.A. gasketB. packingC. washerD. spring1143. Centrifugal pumps, however, can be designed with a number of impellers_____ to attain a large amount of liquid.A. in seriesB. in parallelC. assembledD. together1144. Gear pumps are_____ because they discharge a near constant amount of liquid regardless of pressure.A. negative displacement typeB. turbine typeC. positive displacement typeD. mixed-flow type1145. The_____ discharge a nearly constant amount of liquid regardless of pressure.A. mixed-flow pumpB. axial-flow pumpC. centrifugal pumpD. displacement pump1146. The gear, screw, and vane pumps are all classified as_____.A. variable stroke pumpsB. multistage pumpsC. positive displacement pumpsD. triple-ported pumps1147. Which of the following are components of a mechanical seal? (1) stationaryring; (2) rotational ring; (3) packing; (4)spring.A. (1), (2) and (3)B. (1), (2) and (4)C. (2), (3) and (4)D. None of the above. 1148. The pressure head of a water pump is given in the unit of_____.A. kgB. MPaC. mH20D. None of the above.1149. A vane pump belongs to_____ according to its working principle.A. reciprocating pumpsB. positive displacement pumpsC. centrifugal pumpsD. centripetal pumps1150. Attempts are made to eliminate axial thrust in centrifugal pump by_____.A. providing the impeller with counterbalancing holesB. the use of symmetrical impellerC. neither A nor BD. A and B (either A or B)1151. Air chambers are usually fitted to reciprocating pumps in order to_____.A. increase discharge pressureB. increase suction vacuumC. develop pulsation flowD. keep a steady rate of flow 1152. A positive displacement pump is that where the volume of the pump chamber is alternately_____ to draw the liquid in and then_____ to force the liquid out.A. increased / decreasedB. decreased/increasedC. decreased/decreasedD. increased/increased1153. Which of the following pumps are self-priming, and can deal with liquid from a level below the pump? (1) reciprocating; (2) rotary; (3) centrifugal.A. (1) onlyB. (1) and (2)C. (1), (2) and (3)D. (2) and (3)1154. Which of the following pumps are self-priming, and can deal with liquid from a level below the pump? (1) reeiproeating; (2) vane; (3) gear.A. (1) onlyB. (1) and (2)C. (1), (2) and (3)D. (2) and (3)1155. A pump is said to have "negative suction head" when the pump is located_____.A. between the suction and dischargeB. below the liquid supplyC. above the liquid supplyD. any of the above1156. If a bilge pump failed to build up discharge pressure, you should check for_____.A. excessive water in the bilgesB. a clogged suction straine rC. oil in the bilgesD. a closed skin valve1157. The advantage of a centrifugal pump as compared with a reciprocating pump is that _____.A. discharge is continuousB. it has no internal valvesC. upon accidental closing of discharge valve, excessive pressure will not build upD. all of the above are true1158. Which of the following pumps belongs to centrifugal pump?A. Reciprocating pump.B. Screw pump.C. Diffuser pump.D. Water-ring pump. 1159. While flowing through the volute in a centrifugal, part of the_____ energy of the liquid is converted to_____ energy.A. kinetic/pressureB. kinetic/essentialC. pressure/kineticD. pressure/height1160. When a hydraulic vane pump is working, which of the following is in contact with the vanes? (1) the rotor; (2) the internal surface of the housing; (3) the external surface of the housing.A. (1) onlyB. (2) onlyC. (1) and (2)D. (1), (2) and (3) 1161. It is possible to mount a double suction centrifugal pump impeller with the vanes facing in the wrong direction. This would cause the pump_____.A. head capacity to improveB. discharge to be reversedC. efficiency to decreaseD. slippage to decrease1162. A double suction centrifugal pump impeller has been installed in the reverse direction, and will_____.A. have a greater head capacityB. operate with increased impeller efficiencyC. discharge through the suction side of the pump casingD. require more power to run the shaft1163. If a centrifugal pump were continually operated with the discharge valve closed, the _____.A. motor controller overload would openB. pump would eventually overheatC. relief valve would continuously cycle openD. motor would overheat1164. A centrifugal bilge pump requires priming_____.A. primarily to lubricate the shaft sealsB. due to the inability of this type of pump to lift water to cover the suction (eye) of the impellerC. to initially unload the pump by having its head pressure equal to discharge pressureD. in order to overcome the potential energy of water in the discharge line1165. Which of the listed conditions can lead to cavitation in a centrifugal pump? A. Vapor pockets formed in the suction flow stream B. Rough easing volute surfacesC. Worn wearing ringsD. Heavy fluid in theflow stream1166. What is a function of the wearing rings used in most centrifugal pumps?A. Absorb erosion of high velocity discharge stream.B. Seal pump shaft against entry of air.C. Isolate the discharge side from the suction side.D. Dampen the turbulent discharge flow.1167. In a radial piston pump, reversal and control of fluid flow are accomplished by moving the _____.A. central valveB. radial plungerC. floating ringD. cylinder body 1168. To maintain design discharge pressure from a centrifugal pump, the design clearance must be maintained between the_____.A. shaft and impellerB. motor and pump shaftC. casing and impeller wearing ringsD. lantern ring and impeller1169. If a radial piston hydraulic pump fails to deliver rated fluid volume, the cause can be _____.A. contaminated fluidB. pitted thrust ringsC. worn pintle bearingsD. obstructed suctions passage1170. With respect to centrifugal pump impellers, which of the following descriptions represents the correct centrifugal pump classification?A. Single stage or multistage.B. High pressure or low pressure.C. Open or close coupled.D. Horizontal or vertical.1171. The static suction lift of a pump is the difference in elevation between the_____.A. centerline of the pump and the level of the liquid in the suction well when the source of liquid is below the pumpB. centerline of the pump and the suction liquid level when the source of liquid is above the pumpC. centerline of the pump and the level of the discharge liquidD. liquid levels of the suction and discharge1172. The usual number of single-acting pistons used in a variable stroke axial-piston pump is_____.A. 3 or 5B. 5 or 7C. 7 or 9D. 9 or 111173. An axial piston pump differs from a radial piston pump as the pistons of an axial piston pump are positioned_____.A. radially from the shaftB. parallel to each other and to the shaftC. parallel to each other but at a right angle to the shaftD. at an angle to each other and to the shaft1174. Why are removable sleeves installed on centrifugal pump shafts?A. They make it easier to replace the pump shaft packing.B. They can be economically replaced as they wear out.\C. They can be removed when it is necessary to lighten the weight of the pump.D. They increase the strength of the shaft.1175. Which of the following statements represents the advantage of rotary pumps as compared to reciprocating pumps?A. The high discharge pressure of the rotary pumps permits a larger volume of fluid per unit time than the reciprocating pump.B. Rotary pumps are capable of pumping more fluid than reciprocating pumps of the same weight.C. Rotary pumps occupy only one-half the space of reciprocating pumps.D. Rotary pumps eliminate discharge slippage of the pumped liquid, while this does not hold true for a reciprocating pump.1176. Increasing the speed of a rotary pump above its rated speed will result in which of the following conditions to occur?A. Loss of suctionB. Increased clearancesC. Decreased clearancesD. Decreased slippage1177. One of the main differences between the various types of screw pumps is in the _____.A. stuffing box diameterB. direction of rotation of the screwsC. pitch of the screwsD. type of driving gears1178. A distinguishing feature of an eductor(喷射器), when compared to other pumps, is the _____.A. discharge end being smaller than the suction endB. small size of impellerC. lack of moving partsD. ease at which the wearing rings may be changed1179. Which features of a centrifugal pump reduce the need for renewing worn impellers and pump casings?A. Close radial clearance between impeller hub and casing.B. Low rotational speed of impeller.C. Removable end plate.D. Replaceable impeller and casing wearing rings.1180. A centrifugal pump may fail to deliver water when first started if the_____. A. water seal pipe is plugged B. pump is not primedC. seal ring is improperly locatedD. impeller is flooded1181. Which of the devices listed is common to all types of pumps?A. A power end and fluid end.B. A propeller and educator.C. A volute and impeller.D. A turbine and piston.1182. If a centrifugal pump vibrates and is noisy when operating, the cause could be_____.A. worn gland sealing shaftB. worn wearing ringsC. a bent shaftD. reversed pump coupling1183. If the capacity of a centrifugal pump decreases gradually over a long period of time, you should replace the_____.A. packing glandB. mechanical sealsC. lantern ringsD. wearing rings 1184. To absorb the wear resulting from impeller rotation and abrasives in the liquid, a centrifugal pump is usually fitted with_____.A. lantern ringsB. bearingsC. easing volutesD. wearing rings 1185. If a centrifugal pump is driven by a constant speed electric motor and produces a discharge pressure less than designed, the cause is probably_____.A. excessive pump speedB. excessive suction headC. worn wearing ringsD. gross pump misalignment1186. The packing installed in the pump stuffing box is lubricated by_____.A. gravity and feed oil cupsB. grease cupsC. hand during installationD. leakage through the stuffing box 1187. If you were operating a centrifugal water service pump with worn wearing rings , the_____.A. pump would be very noisyB. pump would vibrate excessivelyC. pump would develop insufficient flowD. stuffing box would leak excessively1188. One of the main functions of wearing rings, as used in a centrifugal pumps, is to_____.A. maintain radial alignment between the pump impeller and casingB. absorb all impeller shaft end thrustC. prevent water leakage to the atmosphereD. prevent wear of the pump casing and/or impeller1189. After installing a new hydraulic pump in a system, what special attention should be given to the hydraulic system?A. The relief valves in the system should be readjusted.B. The filters and strainers should be checked frequently.C. All system pressure should be readjusted.D. The system should be drained and renewed with a fluid of different operating characteristics.1190. Which of the following is operated from the main engine room console on anautomated vessel?A. Fire pump and lube oil pumpB. Lube oil pump and distilling plantC. Distilling plant and shaft alley doorD. Shaft alley door and fixed CO2 release1191. Which of the following terms is used to identify the pressure of the liquid entering a pump?A. Suction headB. Pump headC. Discharge headD. Total head 1192. If the discharge valve is closed before the drive motor is stopped, which of the following types of pumps will most likely be damaged?A. CentrifugalB. GearC. PropellerD. Turbine1193. Which of the following statements is/are true regarding hydraulic pumps in general?A. Variable volumes can be obtained with gear pumps only by variation of the pump drive speed.B. A radial piston pump houses sliding pistons in a stationary cylinder block through which passes a rotating pintle or ported shaft.C. The amount of fluid displaced per revolution of an axial piston rotary pump is dependent on the angle formed between the cylinder block and valve plate.D. All of the above.1194. The delivery rate of a variable stroke axial piston hydraulic pump is controlled by varying the position of the_____.A. slide blockB. tilting boxC. pintleD. reaction ring1195. The pressure of a liquid leaving the pump can be referred to as the_____.A. total headB. discharge headC. net positive suction headD. suction head1196. Air leakage between the shaft and stuffing box packing in a centrifugal pump is prevented by_____.A. a compressed packing glandB. lantern tings between the packing ringsC. a liquid sealD. the stuffing box gland1197. The suction - force principle of operation is a typical characteristic of_____. A. centrifugal pumps B. jet pumps C. propeller pumps D. reciprocating pumps1198. Hydraulic pumps most commonly used in steering systems are of the_____. A. lobe type B. screw type C. axial piston type D. volute type1199. An axial piston, variable stroke pump is used in a vessel's hydraulic steeringgear. Under pressure, oil continually leaks out from between the valve plate/cylinder barrel and will _____.A. cause loss of hydraulic oil from the systemB. result in extreme damage to the pumpC. cause damage to the pump ff not continually drained from the pump casingD. result in the system high side pressure to substantially drop off1200. A centrifugal pump vibrates excessively during operation. Upon disassembling the pump it is found that the impeller is out of balance. Without an available spare, you should_____.A. drill holes through the heavy side of the impeller until it balancesB. weld counterweights to the light side of the impellerC. remove metal from the heavy side by machining in a latheD. acid wash and serape the heavy side until it balances1201. An increase in rotor clearances in a rotary pump will_____.A. increase discharge pressureB. decrease pump capacityC. decrease pump cavitation,D. decrease reaction ring clearance1202. The internal force of a material, which tends to resist deformation when subjected to external forces, is known as_____.A. stressB. strainC. shear strengthD. ultimate tensile strength 1203. In an electro-hydraulic steering system, under movement is maintained in close synchronization with the steering wheel position by means of the_____.A. trick-wheelB. follow-up controlC. six-way valveD. Rapson slide1204. Crankcase sweating in a refrigeration system is caused by_____.A. a stuck solenoid valveB. a shortage of refrigerantC. too much oil in circulationD. too much superheat1205. If a refrigeration system compressor crankcase is sweating, you should_____.A. add refrigerant to the systemB. adjust the thermal expansion valve to the proper settingC. adjust the float valve to the proper holding pressureD. open the hand expansion valve1206. A multistage centrifugal pump can be BEST described as having_____.A. two or more impellers housed together in one casing and mounted on a single shaftB. a single stepped impeller mounted in a progressively staged casingC. a large radial clearance between the impeller and casing to prevent overheating due to friction。

三管轮机考英语真题(1)

1.Generally the function of lubrication is to form of a film of lubricant between any two surfaces that have relative __B___, so that surfaces don’t get touch with each other.A.RatioB.MotionC.GravityD.Density2.____C____ assists to emulsify oil and water into an even emulsion mixture for a fine atomizing of an incinerator.A.A continuous agitationB.An intermittent vibrationC.A continuous vibrationD.An intermittent agitation3.When the machinery spaces are in the periodic unmanned condition, ___C___ shall be immediately available and on call to attend the machinery space.A.the designated surveyor from classification societyB.the designated engineer from shipyardC.the designated duty officer in charge of the engineering watchD.the chief engineer4.____A___ is used to prevent the entry of sea water to the machinery space.A.Sterntube sealing equipmentB.A special sealing glandC.TailshaftD.Propeller5.The ratio of the brake horsepower to the indicated horsepower of a diesel engine is its _____D______.A.volumetric efficiencyB.thermal efficiencyC.Brake thermal efficiencyD.Mechanical efficiency6. A distorted furnace in a fire-tube auxiliary boiler may be the result of _____D___.A.Firing for extended periods in the low fire modeB.Varying the water level above the crown sheetC.Carrying excessive alkalinity in the boiler waterD.Overheating, due to waterside deposits7.When monitoring diesel engine performance, the most useful instrument to use is the _________A_.A.exhaust gas pyrometerB.Fuel flow rate meterC.Dwell-tachometerD.Exhaust gas analyzer8.___A____ are commonly used in mechanical-hydraulic governor to sense engine speeds.A.FlywheelsB.BulksC.Rotating weightsD.Bulbs9.If fuel oil were being discharged from the waste water outlet of a fuel oil disk type centrifuge, operated as a separator, you should _____D____.A.install an additional discharge ringB.remove the discharge ringC.Slow the centrifuge to its properD.re-prime the purifier10.The refrigerant leaves the evaporator of a refrigeration system as a low pressure ___A______.A.Superheated vaporB.High temperature liquidC.Oil saturated liquidD.subcooled liquid11.The International Sewage Pollution prevention Certificate shall be issued for a period specified by the Administration, which shall not exceed ___D_______from the date of issue.A.one yearB.Three yearC.Six monthsD.Five yearsed engine oil may be properly disposed of by _____B______.A.pumping or throwing it over the side in portB.Draining it into the bilgesC.Dumping it in a gasoline fuel tankD.Discharging it to a dockside oil waste station13._____A____ is not installed on the emergency switchboard.A.SynchroscopeB.WattmeterC.AmmeterD.Voltmeter14.An electrical device which employs a stationary armature and a rotating electromagnetic field is used aboard as a _____B______.A.saturable core reactorB.Shlp’s service alternatorC.Three-wire DC generatorD.Magnetic amplifier15.Insulation light is located on __B______of main switchboard.A.Emergency generator control panelB.Load panelC.Main generator control panelD.Paralleling panel16.when accumulated carbon at the air inlet ports of a two-stroke/cycle diesel engine is being removed, you should take care to avoid carbon particles ____A____.A.entering the cylinderB.Becoming lodged under the intake valvesC.Entering lube oilD.Entering the jacket water17. A high viscous fuel will require ____C____ in order to make it flow.A.StirringB.CoolingC.HeatingD.Mixing with lower viscous oil18.It is not necessary for you to check _____A____ to ensure the complete ignition of fuel in the boiler furnace.A.Water level gaugeB.Smoke indicatorC.FunnelD.Burner flame19.As for oil separator, ___A____ contributes to poor separation efficiency and carries over of water into the clean oil outlet.A.A too small gravity discB.The high speed motorC.A too big gravity discD.The high oil temperature20.this arrangement is ____C_____ if the elements are directly connected to one another and the control action takes place without human involvement.A. a manual closed loopB. A manual opened loopC.An automatic closed loopD.An automatic opened loop21.The separation of impurities and water from __B_______ is essential for good combustion of diesel engines.A.lube oilB.Fuel oilC.GreaseD.Turbine oil22.the function of the hydraulic telemotor transmitter used in an electro-hydraulic steering gear system is to _____A______.A.transmit the rudder angle to the bridge indicatorB.Automatically purge all entrained air from the systemC.Prevent the control linkage from striking the stops when har overD.Send hydraulic signals to the receiving unit.23.when the aerobic biological sewage plant is put into operation, the air to __C_________ should be __________.A.settling compartment / pumped in continuouslyB.Settling compartment / supplied at intervalsC.The aeration compartment / pumped in continuouslyD.The aeration compartment / supplied at intervals24.Under ISPS Code, the ship to which it applies has to carry ____D_____.A. a Safety Management CertificateB.An International Ballast Water Management CertificateC.An International Oil Pollution Prevention CertificateD.An International Ship Security Certificate25.Fuel is delivered into the combustion space by ____B______.A. a lubricating systemB.An injection systemC. A cooling systemD.An electric system26.the _________ should be kept running for about half an hour after F.W.E.A.fuel oil pumpB.Air compressorC.Crankcase lubricating oil pumpD.Auxiliary blower27.Which one is the ‘ clear grounds ’ for a more detailed inspection ___A____?A.one of ship’s certificates required is invalidB.No operation procedures for the oil separatorC.Damaged sanitary pumpD.Paint peeling off the uptake28.An exhaust gas bypass is installed on a waste heat boiler in order to __A_____.A.minimize moisture condensation in the boiler gas passages at low loads.B.Recycle exhaust gas to the turbochargerC.Bypass exhaust gas at high loads to prevent excessive back pressure.D.Bypass a portion of the exhaust gas at peak loads for bet efficiency.29.the operating medium for deck crane motors may be ___C___ .A.Steampressed airC.Hydraulic or electricD.The fuel oil30.The time of discharging oil is short, and oily water separator discharges oil frequently. The possible reason is __B_____.A.the screw pump is worn seriously and volumetric (测定体积的) efficiency is decreasedB.The coarse strainer before the pump in suction system is cloggedC.The sensor of low oil level is fully covered by sludge oilD.Bilge suction valve is clogged31. when a vacuum boiling evaporator works, the hot jacket water will pass over the tube stack and _____D__ the sea water passing through the tubes.A. DissipatesB. DisposeC. dissolveD. heat32. which of the following precautions must be taken if an electric immersion heater is used to keep the coolant in a diesel engine warm during the time the engine is secured ? DA. the pressure cap must be removed while the engine is securedB. the coolant temperature must be maintained at 180℃.C. electrical power, to the heater must be secured before the cooling system is drained.D. the thermostatic bypass valves must be manually opened before the engine is started33. the alarm signal for engine room catching fire is a blast of random bell followed by __A___.A. four knocksB. two knocksC. three knocksD. five knocks34. In a ____C__ engine the charge of air in the cylinder before compression commences is above atmospheric pressure.A. contaminatedB. naturally aspiratedC. pressure chargedD. high speed diesel35. the officer in charge of the engineering watch shall ensure that at all times bridge orders relating to changes in ___B___ of operation are immediately implemented.A. fore or aftB. Speed or directionC. ahead or asternD. up or down36. in a two-stroke/cycle diesel engine, the camshaft rotates at ____D__.A. a speed independent of the crankshaftB. twice the crankshaft speedC. half the crankshaft speedD. the same speed as the crankshaft37. what is the application of high-speed diesel engines at sea ? D①They are used for emergency power generation to small applications.②they are used for electrical power generation on board ships driven by medium-speed propulsion engines.③they can be used on tugs, ferries and barges etc. As main engines.A.①②B.③C.②③D.①②③38.At the earliest indication of fire aboard your vessel. You must FIRST __D____.A.fight the fireB.Determine which type of fire is burningC.Locate the fireD.Sound the alarm39.During the diesel engine running period, the water level of F.W expansion tank should normally kept at the ___A___level of glass tube.A.1/2~3/4B.LowestC.HighestD.Above 3/440.in a series circuit, which value will remain unchanged at all places in the circuit ? CA.ResistanceB.VoltageC.CurrentD.Inductance41.Oily water separators are used to ensure that ships don’t discharge oil when __B___ bilge water.A.It pumping outB.Pumping outC.To pump offD.Being pumped42.over-greasing of ball bearings installed on pumps will result in __A___.A.overheating of the bearingB.Reduced corrosion in the bearingC.Increased pump capacityD.Smoother pump operation43.the usual number of single-acting pistons used in a variable stroke axial-piston pump is ___B__.A.5 or 7B.7 or 9C.3 or 5D.9 or 1144.which one has not been specified in the SOLAS Convention ? AA.Standards for the safety of ships onlyB.Standards for the safety of ships as well as peopleC.Standards for the operation of shipsD.Standards for the construction equipment of ships45.in maritime labour convention , hours of rest may be divided into no more than two periods, one of which shall be at least __D___ hour in length, and the interval between consecutive periods of rest shall not exceed 14 hours.A.FiveB.FourC.TenD.Six46.the __B___ transfers the thrust from the propeller to the hull of the ship.A.Thrust shaftB.Thrust blockC.Main engineD.Propulsion system47.Duties shall be so organized by ___D__ that the first watch at the commencement of a voyage and the subsequent relieving watches are sufficiently rested and otherwise fit for duty . A.The duty engineerB.The second engineer officerC.The masterD.The chief engineer officer48.In the event of a small bunker oil spill on deck occurring while bunkering(装燃料，燃料贮存), you should __A____.A.Cover the area with absorbent materialB.Wash down the area with keroseneC.Wash down the area immediately with a fire hoseD.Cover the area with foam49.to stop the running air-conditioner in the winter, we should ___D___.A.firstly close humidifier valve and then stop the fan motor immediatelyB.Stop the fan motor and close Humidifier valve at the same timeC.Firstly stop the fan motor and then close humidifier valve immediatelyD.Firstly close humidifier valve and then stop the fan motor after 30 seconds.50.the burning of ____C__ is a class ‘C’ fire.A.Dunnage(手提物品，日常用品)B.Diesel oilC.Electrical insulationD.Magnesium51.before a marine diesel engine is stared, the cylinders and pistons must be ___D__.A.Cooled to appropriate temperatureB.Ground and polishedC.Opened up and renewedD.Warmed up gradually to appropriate temperature52.which condition doesn’t need to be met when the synchronous generator is under paralleling operation? AA.equal in powerB.The same phase-sequenceC.Equal in voltageD.Equal in frequency53.the principal purpose of an anchor windlass chain stopper is to __C___.A.Absorb the brake thrust of the anchor windlassB.Tie off the warping head linesC.Hold the anchor chain while riding at anchorD.Lock the intermediate clutch shaft to the wildcat54.Sparking at the brushes of a running motor could be an indication of __B___.A.Normal operationB.A dirty commutatorC.Water vapor absorptionD.Increased brush capacity55.the ___A____ requires that maintenance and repair procedures are performed at fixed calendar intervals.A.Periodic maintenanceB.Forced maintenanceC.Conditional maintenanceD.Predictive maintenance56.in a two-stroke engine, the piston consists of two parts, the lower part is named as __D___ and usually made of cast iron.A.Piston grooveB.Piston headC.Piston crownD.Piston skirt57.diesel engine automated control systems may utilize sensing devices of dual function, with sensing ranges providing both alarm and engine shut down capability. which of the key points listed would only require an alarm sensor? CA.Engine over-speedB.Jacket water pressure and temperatureC.Lube oil sump levelD.Lube oil pressure and temperature58.Current measuring instruments must always be connected in ___A___.A.Series with a circuitB.Series-parallel with a circuitC.Delta with the shuntD.Parallel with a circuit59.UMS stands for __D____ in the maritime subject.A.Unit machined spaceB.Ultra much spaceC.Universal medium systemD.Unattended machinery space60.The load sharing characteristics of two diesel generators operating in parallel are mostly dependent on their governor ___D_____.A.speed limit settingsB.Load limit settingsC.Idle speed settingsD.Speed droop settings61.If a centrifugal pump operating with a positive suction head becomes air bound, your first response should be to ___B___.A.Tighten the packingB.Reprime the pumpC.Vent the casingD.Close the discharge62.__D____ is not a part of the main switchboard on board.A.Paralleling panelB.BusbarC.Load panel of main generatorD.Emergency switch panelually ___A___ handles the majority of the correspondence and negotiation needed during transactions of stores and spare parts in the engine department.A.The chief engineerB.The captainC.The chief mateD.The second engineer64.Heavy fuel oils generally have an upper average ash content of 0.1% by weight. Which of the following conditions could be expected if the ash content increases above this amount? D ?A.Excessive oil pumpingB.Glazing of the cylinder linersC.Increased valve wearD.Increased fuel consumption65.___D____ should not undertake any task which will interfere with the supervision duties relating to the main machinery and associated equipment.A.The chief engineerB.The duty deck officerC.The person on a bunker bargeD.The watch keeping personnel66.First aid means ___A___.A.Emergency treatment at the scene of the injuryB.Medical treatment of accidentC.Setting of broken bonesD.Dosage of medications67.The officer in charge of an engineering watch have the knowledge of erm principles, including obtaining and maintaining ______.A.situational awarenessB.Environmental awarenessC.Safety awarenessD.Anti-pollution awareness。

轮机英语真题47期甲类三管轮

轮机英语真题47期甲类三管轮2021年第1期海船船员适任统考试题（总第47期）一、单项选择题1.The ____engine is used for alternators and some times for main propulsion with a gearbo_ provide a propeller of between 90 to 120 rpm.A.four-strokeB.Two-strokeC.Slow speedD.reversible2.The abbreviation "MIP" stand for_____.A.middle indicating pressureB.mean indicated pressureC.Mean indicated pitchD.Middle indicated power3.The cetane number of a diesel fuel oil indicates its_____.A.V iscosityB.Acid contentC.Heating valueD.ignition quality4.In a two-stroke engine the camshaft rotates at____the engine rotational speed.A.HalfB.twiceC.The same speed asD.Four times5.A diesel engine is similar to a gasoline engine e_cept that the former has no_____.A.Cross-headB.CylinderC.Connecting rodD.spark plug6.It is easier to replace a dry cylinder liner than a wet one because______.A.Of the thin wall thicknessB.honing makes it easier to maintain the desired oil filmC.Water seals are not requiredD.It fits more loosely due to a decrease in heat transfer through the posite wall7.A main bearing consists of two shells which are secured by means of studs and _____.A.Tie rodsB.Through boltsC.Lead wiresD.Bearing caps8.However fast or slow the bustion rate, it is still a _____between carbon, hydrogen, sulph and o_ygen that releases heat.A.Physical deformationB.State e_changeC.Chemical reactionD.Coalescence9.During the fuel injection period, fuel pressure must e_ceed cylinder gas pressure to _____.A.Ensure peration and distribution of the fuel in the bustion chamberB.Ensure the needle valve is flushed clean during each injectionC.Prevent bustion gas blowback into the open needle valveD.Prevent reflected pressure waves when the needle valve closes10.In a diesel engine lube oil system, which of the follog parts should be lubricated first?A.Camshaft bearingMain bearingC.Piston crownsD.Cylinder walls11.In a diesel engine closed fresh water cooling system, the amount of coolant flog through the heat e_changer is controlled by the ______.A.Suction pressure regulatorB.Thermostatic bypass valveC.Sea water temperatureD.Water level in the e_pansion tank12.which of the diesel engine ponent listed increases air density and helps to improve engine operating efficiency?A.impellerB.Air bottleC.Air coolerD.E_haust diffuser13.a large two-stroke/cycle direct reversing diesel engine is to be reversed.Prior to the admission of starting air you must______.line up the engine for restarting with light diesel oilB.Reposition the fuel injection camC.Change the intake and e_haust valve cam positionsD.Place the starting cam in the intermediate position14.Which of the listed governor characteristics will greatly affect the load sharingrelationship between paralleled diesel generators?A.SensitivityB.PowerC.Speed droopD.pensation15.Thermocouple pyrometers are used on large, main propulsiondiesel engines toindicate the temperature of the ______.A.Cooling water leaving each cylinderB.Fuel oil entering the injectorC.E_haust gases at various locationsD.Lube oil at the bearing supplies16.After starting a diesel engine, which of the listed operating conditions should bechecked first?A.Air bo_ pressureB.Lube oil pressureC.E_haust temperaturesD.rawwater pressure17.To shut down a diesel engine after it e_ceeds the set ma_imum speed, which type ofdevice listed should be used ?A.Speed limiting governorB.Over-speed governorC.Over-speed tripD.Over-speed relay18.The treatment of the fuel oils involves storage, heating, filtering and_____.A.CentrifugingB.PressurizingC.AtomizationD.Igniting19.A propeller, in order to operate efficiently, must rotate at a relatively______speed.A.HighB.LowC.FastD.lowlydoc/87379f7131b765ce0508142b.tent heat changes the ___of water.A.physical stateB.TemperatureC.Atmospheric pressureD.Sensiblepressure21.The primary function of a flame safeguard system, as used on an automatically firedau_iliary boiler, is to prevent_____.A.Accidental dry firing and overpressureB.Uncontrolled fires in the furnaceC.E_plosions in the boiler furnaceD.Overheating of the pressure parts22.Improper maintenance of the fuel oil burners in an automatically fired au_iliaryboiler could result in_______.A.increased fuel consumptionB.Increased feed-water consumptionC.Fuel pump failureD.bustion control system failure23.Burner ignition failure in an automatically fired au_iliary boiler would be causedby______.A.A burned out solenoid in the oil supply valveB.High temperature e_cess airC.Incorrectly setting the hot-well dump valveD.An incorrectly positioned burnersnubber relay24.if the feed pump for an au_iliary boiler fails to deliver the feed water to the boiler,the cause may be______.A.High pressure in the boilerB.Abnormally high feed-watertemperatureC.Abnormally high boiler water temperatureD.demand e_ceeding feedpump capacity25.Gear pumps are of positive displacement type pumps because they discharge a nearconstant amount of liquid______pressure.A.Depending onB.In relative toC.Regardless ofD.because of26.A spur gear pump should be operated with the dischargevalves______.A.Slightly openedB.ThrottledC.Fully openedD.Halfway opened27.An independent bilge suction is required for________.A.Ballast tanksB.Sludge tanksC.Machinery space bilgesD.Cargo holdbilges28.To thoroughly pump out the bilges using a horizontally mounted centrifugal pump,the _______.1A.Pump must always be primedB.V olute must impart a radial and rotary motion of the waterC.Suction side connection must guide the liquid to the lantern ringsD.Stuffing bo_ should not be allowed any water leakage29.An inadequate reciprocating bilge pump discharge is most often caused by______.A.Defective safety valvesB.Clogged suction strainersC.Scarred cylinder wallsD.Clogged drain valves30.In a pression refrigeration plant, the hot, high pressure refrigerant gas is cooled by the sea water and bees liquid in the______.doc/87379f7131b765ce0508142b.pressorB.CondenserC.Throttle valveD.Evaporator31.The______only allows for adjustment of temperature in each room by the occupant manually controlling the air volume admitted.A.Central air conditioning systemB.High velocity systemC.Low velocity systemD.Single duct system32.The opening of the humidifier"s valve of air-conditioner should be _____,when the circumstance temperature is raised to above 5~8℃in the ter.A.DecreasedB.IncreasedC.Fi_edD.Closed33.Under normal conditions.The quantity of air circulation bees less and less.What is the reason?A.Dirty delivery ductsB.Too much refrigerantC.The fouling filtersD.High temperature outside34.When bilge water is heated in a holding tank, which one of the follog statement is not accurate?A.The relative high temperature facilitates primary gravity separationB.Most of the oil and organic solvents are raised to the layer.C.The relative high the temperature is, the more the oil will be collectedD.The normal high temperature has little use on the separation of emulsified oil35.If separating effect of the oily water separator is not good, we can improve it by_____.A.Flushing separator with cold waterB.increasing bilge water supply flowC.Heat oily water properlyD.Opening manual oil discharge valve36.Which is the pollution prevention equipment?A.Booster pumpB.EvaporatorC.IncineratorD.Cooler37.When does au_iliary burner of rotary nozzle type incinerator put into use? Ⅰ、when igniting Ⅱ、the waste oil for dealing with is too much Ⅲ、before sping incineratorA.Ⅰ+ⅡB.Ⅰ+ ⅢC.Ⅱ+ ⅢD.Ⅰ+Ⅱ+Ⅲ38.when anaerobic bacteria convert the sewage to an inertsludge,______.A.No o_ygen is neededB.O_ygen is necessaryC.O_ygen is given offD.no gas is produced39.For a I.O.purifier, if the back pressure of the oil outlet is too high, the interface between oil and water in the bowl will______.A.Be interruptedB.Move downwardsC.Move outwardsD.retain original position40.When separating the lube oil without additive, it is usually working with hot water; the aim is to remove _____from it .A.AcidB.Oil sludgeC.Mechanical impurityD.Salinity41.If the bowl of a disk type centrifugal purifier when operated asa separator is not primed the _____.A.Oil has a tendency to emulsify in the bowlB.Purifier will act as a clarifier at the discharge ringC.Oil will be lost through the water discharge portsD.Oil solids will be deposited only at the intermediate disk42.Tube leaks in the distillate cooler of a two stage flash evaporator will resultin______.A.Loss of second stage vacuumB.Contamination of the distillateC.Lower feed mfet temperatureD.Contamination of the second stagecondenser43.Small droplets of water entrained in the flashed vapor produced in a flash-typeevaporator, are removed by the ______.A.Spray pipesB.DemistersC.CondensersD.Splash baffles44.Overflow valve usually be used to ______.A.Control the fluid flow through itB.Prevent the pressure before overflow valve over the specified valueC.Make the pressure after overflow valve steadyD.Control the direction of oil flow45.Among the basic categories of equipment, which of the follog are used toconvert mechanical into hydraulic energy?A.The hydraulic pumpsB.C.Hydraulic cylindersD.Hydraulic motors46.Cargo handling unit is rated according to the _____to be lifted.A.Cargo craneB.JibC.Safe working loadD.Oil pressure47.The part of the anchor dlass that engages the anchor chain for lifting is calledthe ______.A.Warping headB.Fair leadC.WildcatD.Capstan48.In automatic _____, the ch may be overhauled and wire is paidoff the barrel at aPre-determined ma_imum tension.A.CranesB.C.CapstansD.Mooring ches49.The major source of chemical contaminants in hydraulic fluid is ______.A.Microscopic steel shavingsB.Abrasive wasteC.Anti- o_idant poundsD.O_idation by-products50.Before doing any work on a hydraulic system equipped with accumulators, youshould______.A.Drain the accumulators and purge with o_ygenB.Bleed off all stored energy from the accumulators pletelyC.Charge the accumulators to prevent system energy lossD.Pump the hydraulic fluid into the accumulators to prevent fluid loss51.One factor that determines the frequency of an altemator is the ______.A.Number of turns of wire in the armature coilB.Number of magic polesC.Strength of the mags usedD.Output voltage52.The frequency output of an operating alternator is controlled b the _______.A.Relative speed of the rotor polesB.Number of turns of wire in the armaturecoilC.Strength of the mags usedD.Output voltages53.Prior to closing the breaker when paralleling two ACgenerators ,.Theremended practice is to have the frequency of the ining machine______.A.Slightly less than the line frequencyB.The same as the line frequencyC.Slightly greater than the line frequencyD.Have nothing to do with the linefrequency54.If two A.C.Generators are to be operated in parallel, the load is distributed evenly2by______.A.Mens of rheostatB.A balance coilC.Adjusting the governor settingD.Changing e_citation55.The first requirement for logical troubleshooting of ant system is the ability to ______.A.Collect all available data on a casualtyB.Recognize normal operationC.Identify the probable cause of a symptomD.Isolate the faulty ponent56.______is(are) not power supplied by main switchboard directly.A.Steering gear and dlassB.Navigation light and radio power panelC.Navigation device power bo_D.Daily fresh water pump57.The emergency generator or emergency battery is connectedto______on most large ships.A.Distribution boardsB.Section boardsC.Emergency switch boardsD.Main switch boards58.______connectors hold best if a wire is accidentally pulled or a connection bees loose.A.Ring typeB.Fork typeC.Spade typeD."Push on, pull off" type59.The primary function of an electric motor is to ______.A.Develop torqueB.Generate high voltagesC.Produce a magic fieldD.Generate high electrical resistance60.puses placed in series with a thermal trip-type circuit breaker are used for ______.A.Time-delay protectionB.Short-circuit protectionC.Short duration surge protection surge protectionD.Sustained overload protection61.Shore power must be ______during dock repair.A.DisconnectedB.Switched offC.Cut offD.Connected62.The operator of electrical motors should keep a constant check on the loads they carry because __________.A.Low loads necessitate frequent insulation cleaningB.E_ceeding nameplate values shortens useful lifeC.Energy is wasted if full loading is not utilizedD.Power factor correction methods are load dependent63.Before a marine diesel engine is started the cylinders and pistons must be ______.A.Cooled to ropriate temperatureB.Warmed up gradually to ropriate temperatureC.Opened up and renewedD.Ground and polished64.______is a precaution which contributes to avoiding trouble under normal operating conditions.A.Constant inspectionB.Keeping constant loadC.Remaining constant temperatureD.V arying speed65.During ship manoeuvering , when the diesel is sped, which of the follog items is wrong?A.Keep all systems running normallyB.Main engine is available at any momentC.Shut off the starting air bottle outlet valveD.Pay attention to the changes of the system parameters66.A tank which has been sealed for a long period of time can be dangerous because _____.A.Steel surfaces consume o_ygen by rustingB.Sealed tanks usually form a vacuumC.Moisture condenses in the tank, displacing the o_ygenD.Most tank coatings give off poisonous vapors in the presence of moisture67.The class of fire on which a blanketing effect is essential toe_tinguish the fire is_______.A.Class "A"B.Class "B"C.Class "C"D.Class "D"68.Fires in escaping flammable gas are quickly brought undercontrol by_______.A.Sping the flow of gasB.Reducing the chemical chain reactionC.Increasing the o_ygen supplyD.Cooling below the autoignition point69.Which of the follog statements is true concerning carbon dio_ide when used as afire e_tinguishing a gent？A.Carbon dio_ide is corrosive when e_posed to fireB.Carbon dio_ide should be lied slowly to a large engine room fireC.Its total cooling effect is far greater than waterD.Its smothering effect is e_cellent for class B fires70.While on watch in the engine room.Y ou hear a continuous sounding of the generalalarm.Which of the follog actions should you take?A.Make an entry en the official logbookB.Open the master control valves on the fi_ed CO2 system.C.Start the fire pump and check discharge pressureD.Secure au_iliary condenser overboard discharge71.To determine that a partment contains sufficient o_ygen to sustain life, youshould use a/an______.A.E_plosimeterB.O_ygen indicatorC.Fresh air indicatorD.Emergency escape breathing devece72.If the overflow tank high-level alarm sounds while the fuel oil tanks are beingped off.The engineer should __________.A.Close the static leg filling valveB.Close the overflow tank filling valveC.Reduce the fuel oil pumping rateD.S the fuel oil pumping operation73.The _______tools is used in precision work to smooth or enlargea slightlyundersized hole.A.Round outB.Round fileC.ReamerD.Hole driller74.During the dock repair, each sea valve seat should be checked and ratified by_____before reassembled.A.Chief engineerB.SurveyorC.The engineerD.the technique personnel ofthe shipyard75.the additional mark_______in the classification certificate for machinery meanspropulsion aratus is remotely controlled on the navigating bridge control station, and engine assembly control station is unmanned periodically.A.BRCB.MCCC.AUT-0D.AUT-176.The oil record book, as a part of the ship"s official logbook, shall be kept on boardand preserved for a period of ______.A.3years after making the first entryB.2years after the last entryC.3months after last entryD.3years after the last entry77.The valid period of the international oil pollution prevention certificate on boardisn"t more than______.A.One yearB.Two yearsC.Four yearsD.Five years78.During the PSC inspection under the provisions of SOLAS 74.Which one may notbe regarded as clear grounds for ships" detainment?3A.failure of the proper operation of emergency generatorB.Insulation of piping including e_haust pipes in engine room contaminated by oilC.Improper operation of bilge pumping arrangementsD.Damaged sanitary pump79."insufficiency of manning or insufficiency of certification of seafarers" is an identification of a _________.A.Substandard shipB.Standard shipC.Over-standard shipD.Reference ship80.STCW 78/95 convention shall ly to seafarers_______on board seagoing ships entitled to fly the flag of a party.A.ServedB.ServingC.SurveyedD.Surveying81.All engineer officers and engine room ratings shall be aware of the serious effects of operational or accidental pollution of the marine environment and shall take all possible_____to prevent such pollution, particularly within the framework of relevant international and port regulations82.When the order given by bridge may have bad results, the duty engineer should______.doc/87379f7131b765ce0508142b.rm the captain for a further considerationdoc/87379f7131b765ce0508142b.rm the captain, and not perform itC.S the M/B immediately, and then inform the chief engineerD.S the M/B immediately, and then inform the captain83.If an oil spill occurs on deck, you should______.A.Cover the area with foamB.Cover the area with absorbent materialC.Wash down immediately with a fire hoseD.Wash down immediately with an oil dispersing solvent84.According to the international regulations concerning the prevention of pollution of sea areas from ships, the disposal into the sea of all plastics is _______.A.WeleB.Admitted in some special sea areasC.ProhibitedD.Acceptable85.The main objective of the SOLAS convention is ______.A.To provide a solution of lowering pollution at seaB.To specify minimum standards for the members posing the watch at seaC.To specify minimum standards for ships considering their safetyD.To tell the pany how to go about running their business86.Which of the follog about ISM code is not right?A.It aims to ensure safety at seaB.It aims to avoid damage to the environmentC.It aims to prevent human injury or loss of lifeD.If aims to provide a method to run a pany87.The ship security assessment is an essential and integral part of the process of developing and updating____________.A.The ship security planB.The pany security planC.The port security planD.The national security plan88.In order to limit the introduction of alien species by ship, ______was adopted on 13 Feb,20__4 at the IMO.A.Revised Marpol anne_ⅠB.Revised marpol anne_ⅡC.International convention for the control and management of ships" ballast water and sedimentsD.ISPS code二、关联题（关联题题干下有4个小题，每小题4个选项）第一组：Stating Air SystemThe engine is started with pressed air of ma_ 30bar.Minimum pressure required is 15bar.A pressure transmitter PT301 mounted on the starting air line before the main starting valve has an indicator in the instrument panel.The supply line from the staring air bottles is provided with a non return valve and a drain valve.The solenoid valve is electrical(remote control) or manual (on the engine) operated and send after activation a pilot air signal to the main starting air valve.Interruption of the control air doses the main starting air valve.After the main starting air valve is activated the air flows through the flame arresters to the starting air valves in the cylinder heads.The starting air distributor controls the timing of opening and closing of the starting air valves.On the moment the main staring air valve is operated also the governor booster is energized.The main starting air line is provided of a safety valve.Interlock valve is a safety device to avoid an engine start with engaged turning gear.89.As the engine is started with pressed air, the correct sequence of the follogdevices being activated is______.1.solenoid valve 2.Starting air valve 3.Starting air distributor 4.Main starting air valve.doc/87379f7131b765ce0508142b.ernor boosterA.1,5,4,2,3B.1,4,5,3,2C.1,4,3,2,5D.4,3,1,2,590.inderline sentence "the governor booster is energized" probablymeans___________.A.The governor booster is supplied with electric powerB.Hydraulic oil is pumped into the governor boosterC.The governor starts to work before starting the engineD.The governor booster is supplied with pressurized air before starting the engine91.Which of the follog ponents are attached to the air bottles?A.A pressure transmitter PT 301B.A non-return valve and a drain valveC.A solenoid valveD.A starting air distributor92.When the engine is engaged with turning gear, _______can keep the engine fromstarting.A.the control airB.The solenoid valveC.The main starting air valveD.theinterlock valve第二组：（1）The pany should establish procedures to ensure that the ship is maintained in conform the provisions of the relevant rules and regulations and with any additional requirements which established by the pany.（2）In meeting these requirements the pany should ensure that:(2.1) inspections are held at ropriate intervals(2.2) any non-conformity is reported, with its possible cause, if known；(2.3) ropriate corrective action is taken; and(2.4) records of these activities are maintained.(3)The pany should establish procedures in its safety management system toidentify equipment and technical systems the sudden operational failure of which may result in hazardous situations.The safety management system should provide for specific measures aimed at promoting the reliability of arrangements and equipment or technical system that are nor in continuous use.93.This passage concerns ______.A.The inspections of the ship and equipmentB.The reports of non-conformitiesC.The corrective actionsD.The maintenance of the ship and4equipment94.In(2.4) of this passage,"these activities" refers to the follog activities e_cept_________.A.The establishment of any additional requirementB.The corrective action takenC.The inspections heldD.The reporting of any non-conformity95.According to this passage, some particular equipment should have specific measures to promote its reliability, because_______.A.It is not in continuous useB.Its sudden failure may result in hazardous situationsC.Its stand-by arrangements may not be regularly testedD.It may not be identified by the pany"s safety management system96.This passage is probably taken from___________.A.The MARPOL conventionB.The STCW conventionC.The ISPS codeD.The ISM code47轮机英语的答案1- 5 ABDCD 6-10 CDAAB11-15 BCBCC 16-20 BCABA21-25 DAABC 26-30 CCABB31-35 DDCDC 36-40 CBACA41-45 CBBBC 46-50 CCDDB51-55 BACCB 56-60 DCAAB61-65 DBBAC 66-70 ABADC71-75 BDCCC 76-80 DDDAB81-88 CABCCDAC 89-96 BDBDDABD 5。

轮机员英语面试(轮机长、大管轮、二管轮、三管轮适用)

轮机员英语面试（轮机长、大管轮、二管轮、三管轮适用）1、Can you measure oil level? Which method is right, to measure ullage height or to measure oil depth?Both will do. In practice, to measure ullage height is more specific than to measure oil depth. To measure ullage height, we should know the standard height of oil tank. In common practice, we usually measure the oil depth.2、Could you tell the working parts of a gas welding gun?Yes, sir. The working parts include nozzle, oxygen valve, acetylene valve, oxygen supply, acetylene supply. In addition, filler rod is used to fill in welded joint when it melts.注：焊枪是轮机部常用的维修工具，工作时这些部件名称经常涉及到。

3、How to pump out bilge water in the engine room?Pump bilge water into sludge tank. Then pump bilge water into oily water separator. Enquire master or deck officers on duty to pump out at appropriate water. The proportion should not beyond 15 PPM.机舱排污水程序可表述为把污水排到污水集中柜内，再通过油水分离器在允许排放区域按含油量小于15 PPM排放。