轮机英语历年真题41期

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：805

适用对象：无限、近洋航区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. A diesel engine which is rated for normal operation at a crankshaft speed of 800 RPM, is

commonly classed as a ______.

A. slow-speed diesel

B. medium-speed diesel

C. high-speed diesel

D. constant-speed diesel

3.Which of the diesel engine components listed increases air density and helps to improve engine

operating efficiency?

A. Impeller

B. Compressor

C. After-cooler

D. Exhaust diffuser

4.For a given size engine, the two-stroke/cycle diesel engine will deliver more power than a four-

stroke/cycle diesel engine because ______.

A. it has a longer power stroke

B. more air gets into the cylinder each stroke

C. it develops twice as many power strokes at the same speed

D. higher combustion pressure is developed

5.The intake valves in a diesel engine are reseated by ______.

A. cam followers

B. push rods

C. combustion gases

D. valve springs

6.According to the way the energy of the exhaust gases is utilized, pressure-charging can be divided

into two main systems, namely, the constant-pressure system and ______.

A. the pulse-phase system

B. the pulse Doppler system

C. the pulse system

D. the pulse interval system

7.An over-speed safety device is usually fitted to a generator engine for______in the event of over-

speed.

A. cutting power off the engine

B. increasing the fuel pump setting

C. braking the crankshaft

D. stabilizing the ship speed

8.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 fluctuations in pressure.

D. Clean the interior to remove oil and foreign matter.

9.Immediately after any diesel engine is started, the engineer should check the ______.

A. crankcase pressure

B. lube oil pressure

C. seawater pressure

D. exhaust temperature 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.In motor ship, ______is often used to recover some of the heat carried in the exhaust gases from

the main engine.

A. an diesel oil heater

B. a waste heat boiler

C. a fresh water generator

D. a donkey boiler

12.An exhaust gas bypass is installed on a waste heat boiler in order to ______.

A. bypass exhaust gas at high loads to prevent excessive back pressure

B. bypass a portion of the exhaust gas at peak loads for better efficiency

C. recycle exhaust gas to the turbocharger

D. minimize moisture condensation in the boiler gas passages at low loads

13.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. blow down the gage glass

D. assure protective steam flow

14.Flame failure in an automatically fired auxiliary boiler can mostly result from a/an ______.

A. incorrect electrode setting

B. incorrect nozzle position

C. clogged fuel nozzle

D. broken high tension lead

15.Waterside scale in a fire-tube boiler may cause ______.

A. increased heat transfer

B. fireside erosion

C. high steam demand

D. overheated tubes

16.Which of the following will be the advantage of a centrifugal pump as compared with a

reciprocating pump? I. Its discharge is continuous; II. It has no internal valves; III. Upon

accidental closing of discharge valve, excessive pressure will not build up

A. I, II

B. II, III

C. I, II, III

D. II only

17.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.

18.If one of the bilge system manifold valves does not properly seat, the ______.

A. bilge well connected to that valve, plus the second bilge well being pumped will be completely

emptied

B. bilge system will lose vacuum and prevent the other bilges from being pumped out

C. bilge well aft connected to that valve will siphon(虹吸) its contents to the forward bilge wells

D. discharge pressure will be too high.

19.Which of the listed statements is correct concerning the starting of centrifugal pumps?

A. They should always be started with the discharge valve closed.

B. They should always be started with the discharge valve opened.

C. A priming pump is always required to flood the impeller suction.

D. They should always be started with the sealing line valves closed.

20.The simplest method to use for determining if a centrifugal pump is operating as designed, is to

______.

A. closely observe the pump discharge temperature

B. close off the discharge valve, and watch for a rise in pressure

C. momentarily close off the suction valve, and watch for a rise in pressure

D. use a clamp on ammeter and compare the readings to past records