轮机英语试题二十四

轮机英语试题⼆⼗四
试题⼆⼗四
⼀、单项选择题：
1.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. hull
B. projection
C. graphitication
D. foundation
2.Which of the two events listed occurs simultaneously in a two-stroke/cycle diesel engine?
A. Exhaust and scavenging.
B. Scavenging and compression.
C. Ignition and expansion.
D. Exhaust and compression.
3.Which of the following may lead to the engine NOT to start on air?
A. starting air pressure too high.
B. correct timing of starting air valves.
C. three of the six starting valves stuck..
D. the turning gear disengaged.
4.The lowest temperature required to cause self-sustained combustion of a substance independent of any outside source of ignition is called ______.
A. explosive range
B. flash point
C. ignition temperature
D. combustion
temperature
5.The function of a lubricating oil is ______to lubricate the running surface ______to carry away a great deal of heat.
A. not/but
B. neither/nor
C. either/or
D. not only/but also
6.The degree to which the viscosity of an oil will change with a change in temperature is
B. viscosity index
C. pour point
D. thermal change
value
7.All three systems have the ports____to swirl the incoming air and direct it in the appropriate
path.
A. angled
B. rounded
C. being angled
D. being rounded
8.Scavenging in a four-stroke/cycle diesel engine occurs during the ______.
A. last part of the exhaust stroke, and the first part of the intake stroke
B. last part of the intake stroke only
C. early part of the injection stroke only
D. early part of the power stroke
9.______in what position the engine stops there will always be at least one of the cylinders
with its starting air valve open to admit compressed air to start the engine.
A. Because
B. Owing to
C. For
D. No matter
10.The process to remove exhaust gases by blowing in fresh air is called ______.
A. charging
B. supercharging
C. starting
D. scavenging
11.Some vessels are equipped with a water lubricated stern tube. When at sea, operating under
normal conditions, the water service valve from the ship's saltwater system to the bearing should be ______.
A. closed, and no leakage permitted across the shaft packing
B. closed, and only slight leakage permitted across the shaft packing
C. opened, and no leakage permitted across the shaft packing
D. opened, and only slight leakage permitted across the shaft packing
12.The required amount in the change of speed necessary before a governor will make a
corrective movement is known as ______.
C. stability
D. promptness
13.The pressure head of a water pump is given in the unit of ______.
A. kg
B. MPa
C. mH 2 O
D. none of the
above
14.The pump discharge pressure will be considerably higher than the pressure at the ______.
A. pump entry branch
B. outlet pipe
C. impeller
D. None of the above is true.
15. A feed pump for an auxiliary boiler might lose suction if the ______.
A. boiler water level is low
B. feedwater is too hot
C. boiler steam demand is low
D. feedwater is too cold
16.To operate a centrifugal fire pump at reduced capacity, you should ______.
A. readjust the relief valve
B. throttle the suction line
C. throttle the discharge valve
D. open the priming line
17.______the moveable plate and floating ring inside the pump is very difficult.
A. Having adjusted
B. Being adjusted
C. To adjust
D. Adjusted
18.Strainers, sometimes called______, are devices designed to prevent the passage of unwanted solids into or further along a system.
A. dampers
B. filters
C. stopper circuits
19. A donkey boiler is ______.
A. one to supply steam to the main propulsion turbine
B. an auxiliary boiler
C. A and B
D. neither A nor B
20.Which of the following statements concerning fire-tube boilers is correct?
A. Combustion gases flow through the tubes.
B. Flames impinge on the tubes.
C. Combustion occurs in the tubes.
D. Water flows through the
tubes.
21.Prior to lighting off a cold automatically fired auxiliary boiler, you should ______.
A. check and regulate the water level
B. close the air cock once fires are lit
C. blowdown the gage glass
D. crack the steam stop to assure
protective steam flow
22.The ______is not a(n) component of an oil separator.
A. sliding bowl bottom
B. gravity disc
C. separating disc
D. scum valve
23. A magnetic strainer is used in the diesel engine reduction gear oil system to remove small
particles of ______.
A. water
B. babbitt
C. iron or steel
D. acids
24.In a complete oil/water separator, more oil will separate out onto the underside of these plates
and travel outwards until it is free to rise into the oil collecting space. What’s the meaning of “it”in the sentence above?
A. a separator
B. oil
C. water
oil collecting space
25.The oil sludge is burnt in the ______onboard. I’ll show you the ashes.
A. boiler
B. main engine
C. auxiliary engine
D. incinerator
26. A burning AC motor would be considered what class of fire?
A. Class ‘A'
B. Class ‘B'
C. Class ‘C'
D. Class ‘D'
27.In which of the listed hydraulic systems will the installation of an oil cooler be necessary?
A. Constant tension mooring winch system
B. Hatch cover system
C. Watertight door system
D. Internal combustion engine hydraulic starter system
28.No specific period is given for the renewal of the lubricating oil filter element as this should
be done ______a figure of 0.7 bars is shown on the gauge.
A. whatever
B. whenever
C. wherever
D. whoever
29.If a hydraulic pump is overheating, the cause may be ______.
A. excessive internal leakage in the pump
B. low discharge pressure and
fluid flow
C. excessive fluid level in the hydraulic reservoir
D. operation of the pump at 100%
efficiency
/doc/3faae70b5afafab069dc5022aaea998fcd224048.html pressed air is used on board ship ______.
A. for starting diesel engines
B. in pneumatic control system
C. in pneumatic tools
D. All the above are true.
evaporator?
A. Distiller air ejector cooling medium
B. Saltwater heater discharge
C. First-stage internal feed box
D. Second-stage internal feed box
32.Supply the ______before starting an air compressor.
A. fuel oil
B. cooling water
C. steam
D. power
33.Sludge may form in the crankcase of an air conditioning compressor as a result of ______.
A. bubbling refrigerant
B. overheating and oxidation
C. lowered operating temperatures
D. reducing the cloud or flash point
34.Ammonia when used as a refrigerant is valuable because of its high efficiency, it is however ____.
A. toxic
B. flammable
C. explosive
D. all of the above
35.Which of the statements listed concerning heat transfer is correct?
A. Heat is always transferred at a constant rate.
B. Heat transfer rate increases as temperature difference increases.
C. The rate of heat transfer is not affected by temperature difference.
D. The high temperature region is known as a heat sink.
36.If a refrigeration compressor will not start, the reason may be ______.
A. the pressure regulating valve is not closing
B. an excessive lack of refrigerant in the
system
C. badly leaking discharge valves
D. worn piston rings
37.In a refrigeration system, if the cooling water to the condenser fails, the ______.
A. box temperature solenoid valve will close
C. compressor will shutdown
D. king valve will open
38.The power factor of an AC generator operating singularly is determined by the ______.
A. connected load
B. prime mover speed
C. field excitation
D. generator's
rated voltage
39. A constant output voltage from an AC generator is maintained by the ______.
A. prime mover governor
B. exciter generator
C. voltage regulator
D. reverse
power relay
40.In order to change the direction of rotation of a D.C. motor ______.
I. the field leads must be changed ; Ⅱ. the input leads must be changed
A. I only
B.Ⅱonly
C. either I or Ⅱ
D. neither I or Ⅱ
41.Which of the following should be the FIRST step in removing a generator from parallel operation?
A. Trip the generator off the switchboard.
B. Turn off all electrical equipment.
C. Remove the load from the 'off going' generator.
D. Increase the cycles of the generator staying on the line.
42.The purpose of a main switchboard circuit breaker's reverse-power trip is to ______.
A. prevent main circuit overload
B. protect the circuit breaker blowout coil
C. prevent alternator motorization
D. prevent low voltage tripout
43.In ______the control action is independent on the output.
A. a closed loop control system
B. an open loop control system
D. a steering gear control system
44.Which of the following marine examples belongs to the open loop control system?
A. accommodation heating system
B. steering gear
C. boiler control
D. cargo
control
45.The viscosity regulator controls the fuel oil temperature ______provide oil at the correct viscosity for combustion.
A. in order that
B. because of
C. in order to
D. owing to
46. A transformer in an electric circuit serves to ______.
A. generate its own electrical power
B. transform electrical energy into mechanical energy
C. increase or decrease circuit voltage as required
D. convert AC current to DC current
47.The liquid flowing in the capillary(⽑细管) is such that the difference in ______readings taken before the capillary and after it is related to the oil viscosity.
A. pressure
B. velocity
C. flow rate
D. temperature
48.Domestic water pump is started automatically by ______which operates as the water level falls to a predetermined level.
A. a level controller
B. a temperature switch
C. a floating ball
D. a pressure
switch
49.The additional mark ______in the Classification Certificate for Machinery means propulsion apparatus is remotely controlled on the navigating bridge control station, and engine assembly control station is unmanned periodically.
B. MCC
C. AUT-0
D. AUT-1
50.Low compression of diesel engine may result from ______.
A. a worn cylinder
B. broken piston rings
C. any of A and B
D. none of the
above
51.White smoke exhausting from an operating diesel engine may indicate ______.
A. a cracked liner
B. burning lube oil
C. an overloaded engine
D. insufficient
combustion air
52.Defective timing gear in a diesel engine may lead to:
A. smoky exhaust
B. starting failure
C. overload
D. over speed
53.Poor combustion in a diesel engine can be caused by ______.
A. high compression pressure
B. low intake air temperature
C. low exhaust pressure
D. high scavenge air temperature
54.An automated diesel engine should normally shut down due to ______.
A. low lube oil temperature
B. high ambient air temperature
C. low lube oil pressure
D. high exhaust system back pressure
55.To successfully reduce an excessively high diesel engine exhaust gas temperature, you should ______.
A. reduce the engine driven fuel pump outlet pressure
B. retard the fuel injector timing to reduce power
D. reduce the load on the engine
56.______, the engine must be stopped immediately.
A. Should knocking occur
B. If knocking occur
C. Should if knocking occurs
D. If occur knocking
57.Lower suction pressure of a pump may be caused by ______.
A. too much air in the pipe line
B. closed inlet valve
C. empty tank
D. leaky
pipe
58.Each journal and pin should be examined for ______and grooving.
A. bridges
B. recesses
C. rears
D. ridging
59. A built-up exhaust valve is one in which ______.
A. the stem and heads are made of different material
B. low-alloy steel is used throughout
C. a replaceable valve disk is welded to the head
D. the self-centering action comes from motion of the valve stem in the guide
/doc/3faae70b5afafab069dc5022aaea998fcd224048.html bustion knock can occur in the cylinders of a diesel engine under any condition
permitting ______.
A. a shortened ignition delay period
B. a lean fuel/air mixture
C. excess fuel in the combustion chamber
D. rapid vaporization of injected fuel droplets
61.The bearing cap and shell are replaced and tightened up until ______.
A. the “nip ”is zero
B. the “nap ”is zero
C. the “gap ”is correct
D. the “clearance ”is correct
B. cross-sectional area increases
C. temperature increases
D. percent of metallic purities increases
63.Oil mist detectors are usually used on board to detect oil mist density within ______.
A. the engine crankcase
B. the engine scavenge boxes
C. drain tanks
D.
fuel tanks
64.Tools with ______handles should be used to check electric circuit.
A. plastic
B. metal
C. stainless steel
D. copper
65.The crankcase cover should not be opened until at least ______minutes after the engine stops.
A. 10
B. 15
C. 20
D. 30
66.“Movement of engine no longer required.”means “______”.
A. Stop Engine
B. No Engine Revolution
C. Stand-by Engine
D. Finished With
Engine
67.Under the provisions of applicable international conventions, ships entitled to fly the flag of a
Party are subject, while in the port of a Party, to control by officers duly authorized by the Party. Ships of non-parties or below convention size shall be given ______.
A. more favorable treatment
B. less favorable treatment
C. no more favorable treatment
D. the most favorable treatment
68.The conventions under which the port state control inspection is carried out include all the
following except ______.
A. SOLAS 74
B. MARPOL 73/78
C. STCW 78/95
D. ISM Code
69.If you burned your arm on a bare steam line, the most effective immediate treatment would be to______.
A. wrap the arm in a tight bandage
B. soak the arm in hot salt water
C. cover the burn with petroleum jelly
D. put the burn in cold water
70.If liquid refrigerant accidentally comes in contact with the eyes, ______immediately.
A. rub the eyes
B.
irritate the eyes
C. wash the eyes with a heavy boric acid solution
D. obtain medical help
71.Diesel fuel is relatively safe to handle due to its low volatility（挥发）, but the fumes will self-ignite and continue to burn steadily if the fuel is heated to the ______.
A. flash point
B. auto-ignition point
C. volatility point
D. upper explosive
limit
72.Duty officer informs us that the vessel is out of harbor and in “Full Ahead”.We are going to run ______.
A. diesel oil instead of fuel oil
B. fuel oil instead of diesel oil
C. diesel oil instead fuel oil
D. fuel oil instead diesel oil
73.A(An) ______should be issued for every company complying with the requirement of the ISM Code by the Administration.
A. ISM
B. DOC
C. SMC
D. PSC
74.The term “moderate speed”was previously interpreted as meaning a speed which would enable a vessel ______within half the range of visibility.
A. stopping
B. being stopped
C. to stop
D. to be stopped
⼆、关联题（每组关联题题⼲下有4个⼩题，每⼩题4个选项）
Each of the engine cylinders is provided with a Bosch, type PF, fuel pump. The fuel pump is a single-acting plunger pump with non-adjustable stroke. The
plunger is so accurately ground and lapped that its clearance inside the barrel is only
0.002-0.003 mm. This provides sufficient tightness between plunger and barrel, even at
pressures as high as 200-400 bar, without the need for sealing materials. Neither the plunger nor the barrel can therefore be renewed individually. The plunger pressure stroke is produced by a cam on the engine camshaft, whereas the return stroke, the suction stroke is effected by means of a strong coil spring. The top of the pump barrel is closed by a spring-loaded
pressure valve, to which the fuel oil pipe for the respective fuel valve on the relevant engine cylinder is connected.
Regulation of the amount of fuel delivered by the fuel pump is achieved by turning the pump plunger, the cylindrical surface of which has a milled recess. The bottom of this recess ends with an edge, which is at right angles to the cylinder generating lines, whereas the top of the recess is limited by a helix. This produces an inclined control edge on the plunger, which also has a narrow longitudinal groove. In the pump barrel are drilled two diametrical holes through which the fuel oil can flow into the fuel pump barrel. The pump barrel is surrounded by a regulating sleeve, the upper end of which is shaped as a toothed rim. The lower end has two lengthwise slots in which projecting lugs on the lower end of the plunger can slide up and down. The end of the regulating rod from the engine governor is designed as a toothed rack that engages with the toothed rim on the end of the regulating sleeve. This makes it
possible to turn the pump plunger during engine operation.
75.The fuel pump ______.
A. is of PF type
B. is of reciprocating
type
C. has an inlet valve and an outlet valve
D. A and B are true.
76.The plunger ______.
A. is accurately ground and lapped outside the barrel.
B. has a tiny clearance inside the
barrel
C. can be renewed individually when worn out
D. All of the above are true.
77.Which of the following is true?
A. The stroke of the plunger can be adjusted
B. The outlet
valve is spring loaded
C. The plunger down stroke is accomplished by the spring
D. B and C are true.
78.It can be inferred that when moving the rack ______.
A. the sleeve moves up and down
B. the plunger
moves up and down
C. the effective stroke of the pump will be changed
D. All of the above are true.
三、中译英（共2题，请将答案写在答题纸上）
79.机舱不够清洁，舱底⽔中油⽔混合物过量, 机舱管系包括排⽓管绝热层有油污，舱底⽔管系操作失当。

80.⽕于20时30分扑灭。

主机于2⽉18⽇1时启动，船已恢复向XX港航⾏。