专业英语2选择题

选择题

1 Increased air will raise scavenge efficiency and allow a greater mass of air to be compressed; more fuel may now be burned giving an increased power.

A. specific volume

B. density

C. viscosity

D. calorific value

2 Increasing differential pressure of an oil filter indicates that .

A. it is dirty

B. it is leaky

C. it has been renewed

D. all the above

3 Increasing the temperature of a fuel will reduce its .

A. viscosity

B. pressure

C. resistance

D. setting point

4 It is abnormal that when the engine is being turned by the turning gear or by hand.

A. water discharges from the indicator cocks

B. no water is leaking into crankcase

C. no water in the scavenge belt

D. the rpm is lower than the speed of Dead Slow Ahead

5 It is important that the two condensate drain cocks,fitted to the underside of the air chest, until the engine is placed on full load.

A. remain open

B. remain close

C. retain open

D. retain close

6 It is important that the water very often as this can lead to increased deposits.

A. not be changed

B. be changed

C. should not be changed

D. should be changed

7 It is important to use only pure lead and to choose a thickness of wire which is greater than the normal allowable clearance but this amount.

A. not less than twice

B. greater at least twice than

C. not greater twice than

D. larger three times than

8 It is necessary for us after having served for a certain period.

A. to change to lube oil

B. have the lube oil purified

C. have the lube oil burnt

D. to analyze the lube oil

9 It is necessary to cool the various components of the machinery so that the engine can work properly.

A. continuously

B. regularly

C. constantly

D. period

10 It is necessary to remove from the cooling spaces.

A. scar

B. scale

C. spur

D. bilge

11 It is necessary to remove from the cooling water spaces to improve heat transfer.

A. lime

B. frost

C. scale

D. scar

12 It is relatively to drive the compressor directly from the engine by chain/or other mechanism because some of the additional power is absorbed.

A. economical

B. expansive

C. inexpensive

D. loss

13 It is usual to give the main diesel engine a brief trial on power ahead and astern

before .

A. the indicator cocks are closed

B. “Stand By” is rung on the engine telegraph

C. the engine is turned on by putting in starting air d. the steering gear is checked

14 It is very important that each cylinder should be scavenged before the charged