三管题库

中华人民共和国海事局

2006年第3期海船船员适任证书全国统考试题(总第41期)

科目：轮机英语试卷代号：806

适用对象：近洋航区750-3000KW及以上船舶二/三管轮

（本试卷卷面总分100分，及格分为70分，考试时间为100分钟）

答题说明：请选择一个最合适的答案，并将该答案按答题卡要求，在其相应位置上用2B铅笔涂黑。第1题至74题，每题1分，第75题至78题，每题1.5分,第79题至80题,

每题10分。

一、单项选择题

1. A diesel engine is similar to a gasoline engine except that the former has no ______.

A. cross-head

B. spark plug

C. connecting rod

D. cylinder

2.The abbreviation(缩写) "MIP" stands for ______.

A. middle indicating pressure

B. mean indicated pressure

C. mean indicated pitch

D. middle indicated power

3.Which of the listed conditions will affect the mean effective pressure the most in the cylinders of

a diesel engine?

A. TBN of the lubricating oil

B. Temperature of the lube oil

C. Completeness in the mixing of the fuel and air

D. Temperature of the cooling (sea) water

4.The most rapid period of fuel combustion occurring in a diesel cylinder should begin just before

the piston reaches top dead center and ______.

A. when fuel injection has been completed

B. when fuel vaporization has been completed

C. should continue through the afterburning period

D. should be completed after top dead center

5.The upper section of a piston is called the ______.

A. land

B. skirt

C. crown

D. plate

6.______arrangements have low temperature air and high temperature exhaust gas passing through

adjacent ports , causing temperature differential problems for the liner material.

A. Loop scavenge

B. Cross scavenge

C. Uniflow scavenge

D. Supercharge

7.The total air capacity for non-reversible main engines is to be sufficient for ______.

A. eight consecutive (连续的)starts

B. six consecutive starts

C. ten consecutive starts

D. twelve consecutive starts

8.Engine speeds at which resonance can occur are termed ______.

A. maximum speeds

B. full speeds

C. sea speeds

D. critical speeds

9.Which of the listed diesel engine operating conditions should be checked immediately after any

diesel engine is started?

A. Exhaust temperature

B. Lube oil level

C. Lube oil pressure

D. Water level in the expansion tank 10. A controllable pitch propeller on a diesel driven vessel eliminates the need for ______.

A. friction clutches

B. disconnect clutches

C. reversing gears

D. reduction gears

11.Auxiliary boilers are divided into several classifications, one of which is ______.

A. water-tube supercritical circulation

B. water-tube forced circulation

C. fire-tube controlled circulation

D. fire-tube express circulation

12.Generating tubes in waste heat boilers are finned to ______.

A. reduce gas flow turbulence

B. prevent exhaust gas corrosion

C. increase the rate of combustion

D. increase the rate of heat transfer

13.If an operating auxiliary boiler has a water pH reading of 7, you should ______.

A. bottom blow the boiler

B. treat the water with caustic soda

C. treat the water with chemical scavengers

D. reduce the water alkalinity to recommended readings

14.Burner ignition failure in an automatically fired auxiliary boiler would be caused by ______.

A. a burned out solenoid in the oil supply valve

B. high temperature excess air

C. incorrectly setting the hot-well dump valve

D. an incorrectly positioned burner snubber(缓冲器)relay

15.When it becomes necessary to replace any tubes in a water-tube auxiliary boiler to eliminate leaks

at the tube seats, the replacement tubes should be ______.

A. stress relieved to ensure expansion when rolled

B. annealed to prevent cracking when rolled

C. fitted with a welded backing ring in the seat area

D. rolled, beaded, and seal welded around the bead edge

16. 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 out

B. force the liquid out / draw the liquid in

C. suction/draw

D. deliver/outlet

17.Generally, centrifugal pumps operating without a positive suction head must be primed before

they will move liquid on their own. The priming is usually accomplished with a ______.

A. regenerative pump

B. rotating liquid piston pump

C. jet pump

D. turbine pump

18. A swing check valve is used in a pipeline to ______.

A. maintain a preset pressure on the line

B. closely regulate the amount of flow

C. relieve excessive pressure on the line

D. allow flow in one direction only

19.If the capacity of a centrifugal pump decreases gradually over a long period of time, you should

replace the ______.

A. packing gland

B. mechanical seals

C. lantern rings

D. wearing rings

20.In most pumps and pump motors, over-packing the ball bearings full of grease will result in

______.