轮机英语补充题库600题

the two-stroke diesel engine, it is designed

so 1.In

that the oil impingement is timed to proceed only on the piston ring belt during _________.

（impingement冲击，影响）

B. suction stroke C. expansion stroke D. exhaust stroke

2. In a four-stroke engine, which process lasts the longest period? B. suction and compression process

C. combustion and exhaust process D. working and exhaust process

3. On what do you depend having the air cooler of main engine chemically washed?

A. increased air pressure difference before and aft air cooler

B. reduced exhaust temperature in all cylinders

C. reduced temperature difference between water inlet and outlet 4. When occurring a fire in the scavenge air box,

the following measures should be taken except

for________.

A. reducing speed to SLOW and asking bridge for permission to stop

B. stopping the fuel oil supply D. putting the scavenge air box fire extinguishing equipment into function

5. Continuous surging(喘振) of turbocharger can

be caused by __________.①crash stop of

engine ②increased back pressure after

T.CH.(turbocharger) ③fouled or damaged

turbine nozzle ring

A. all are correct

C. none of the above is correct D. ① only is correct

6. When a sudden increase in demand occurs from

the boiler, the water level in the drum at the

higher pressure will _____________. B. rise slowly C. drop quickly D. drop slowly

7. On modern ships, centrifugal pump with a

self-primer has replaced reciprocating pump as

bilge pump because ________.

A. centrifugal pump is cheaper than reciprocating pump

B. the size of centrifugal pump with same capacity is smaller than that of reciprocating pump

C. centrifugal pump makes maintenance easier than reciprocating pump does 8. Which cause of following will not lead to refrigeration plant short-cycle?

A. lack of refrigerant

B. refrigerant with much water

C. set defectively low pressure relay 9. To receive oil residues from the purification of

fuel and lubricating oils in the machinery

spaces, what kind of tank(s) should be provided

on board?

A. bilge tank 污油柜

C. overflow tank D. oil collecting tank

10. The oil discharge monitoring system in the oil

tanker vessels is used for detecting the amount

of oil discharged overboard to ensure that it

does not exceed ________.

A. 15 liters/nautical mile

C. 60 liters/nautical mile D. 100 liters/nautical mile

11. Which of the following functions is not one of the functions of air conditioner?

A. refreshing the air C. adjusting the air humidity D. adjusting the air temperature

12. Which of the following statements is not true

concerning symptom of a fire in the scavenge

air box?

A. an increase in the exhaust temperature of the affected cylinder

B. the turbocharger may surge D. smoke from the turbocharger air inlet filter will be seen

13. What type of electric motor is most commonly used on board ship?

B. synchronous electric motor

C. fully enclosed electric motor D. watertight electric motor

14. According to the principle of four-stroke diesel

engine, what is the number of its efficient work

stroke per revolution?

B. 1 C. 2

D. 3

15. What is head tank in the closed cooling water system used for?

A. for the release of air from the cooling water

B. providing expansion room for heated cooling water

C. a place for implementing water and water treatment agent 16. The function of synchronous compensating machine(同步补偿) is to _________.

B. reduce voltage oscillation

C. increase the insulation of circuits

D. eliminate regenerated magnetic fields

17. Continuous surging of turbocharger can be

caused by __________.①crash stop of engine

②increased back pressure after T.CH. ③fouled

or damaged turbine nozzle ring

A. all are correct D. ① only is correct

18. A few spots of turbocharger surging can be

caused by ____________. ①crash stop of engine

②rapid increase of engine speed

A. ① only is correct B. ② only is correct

D. neither ① or ② is correct

19. With one or more cylinders out of operation, the engine speed must be reduced because _____.

A. in such cases, the air supply is no longer optimal最佳的, the thermal load will be higher

B. governor hunting will occur

C. torsional vibrations as well as other mechanical vibrations may occur 20. The nameplate of an AC non-synchronous motor

shows that running speed is 1460r/min,

frequency 50Hz. You can infer that the number

of magnetic poles is _________.

B. 4 C. 6

D. 8

21. ―380V/220Y/△‖noted on the nameplate of a non-synchronous motor means that ________.

A. the armature terminals of the motor should be

connected in star formation when voltage of

power supply is 380V

B. the armature terminals of the motor should be

connected in delta formation when voltage of

power supply is 220V D. the armature terminals of the motor should be connected in reverse ways of A and B

22. The initial voltage of self-excitation generator is

generally set up by ________.

B. voltage regulator

C. electrical current for excitation D. the other running generator

23. The DC excitation to the field of brushless

synchronous generator is generally produced by

__.

B. an exciter driven by external prime mover

C. generator itself

D. either A or B

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