大管轮轮机英语综合(33-48期)(9)

A. Carbon dioxide is usually used as a propellant.

B. Carbon dioxide is usually used as an extinguishing gas.

C. If the carbon dioxide is used as a blanketing agent, it should be pressurized. D. The carbon dioxide extinguisher can only be used ashore. 74. In what state is the carbon dioxide in the portable extinguishers?

A. powder B. dry ice C. liquid D. gas

75. How do you detect the leakage of a carbon dioxide portable extinguisher?

A. to record gas pressure. B. to measure its weight.

C. to measure its liquid level. D. to monitor the radioactive source.

76. The reason that the carbon dioxide extinguisher can t be used in the accommodation is that_____.

A. carbon dioxide is a toxic gas B. carbon dioxide is an inertial gas

C. there is a radioactive source in the extinguisher D. it has no effect in a confined space.

中华人民共和国海事局

2005年第1期海船船员适任证书全国统考试题(总第36期)

科目：轮机英语 试卷代号：803

适用对象：无限、近洋航区3000KW及以上船舶大管轮

（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68题，每题1分，第69题至76题，每题1.5分,第77题至78题, 每题10分。

一、单项选择题：

1. Critical speeds occurring within the operating speed range of a main propulsion diesel engine may

be changed, or have their damaging effects reduced by a/an ______.

A. engine support vibration isolator B. detuner or viscous fluid damper C. lightened crankshaft flywheel D. spherically seated crankshaft bearing

2. Precision engine bearing inserts are manufactured with a small portion of the bearing ends

extending beyond the bearing housing or caps. The installation process of these bearings requires

大管轮轮机英语综合

sufficient ______.

A. overlap B. crush C. lap or lead D. protrusion

3. The engine has one or two group of fuel pumps, depending upon ______.

A. the number of fuel valves B. the number of cylinders C. the speed of engine D. the power of engine

4. Which of the following statements concerning the factors affecting ignition delay is correct?

A. An increase in intake air temperature will increase ignition delay. B. An increase in coolant temperature will decrease ignition delay.

C. An increase in combustion chamber turbulence will increase ignition delay. D. An increase in compression ratio will increase ignition delay.

5. ______providing lubricating films, oil used in marine diesel engines has to remove heat from oil

cooled piston.

A. Except for B. Beside C. Except D. In addition to

6. The ability of an oil to separate cleanly from an oil and water mixture is referred to as its ______.

A. precipitation number B. neutralization number C. pour point D. demulsibility 7. Before dismantling the pipe, would you ______the oil retained in the hose with ______?

A. flash/fresh air B. wash/fresh water C. flush/compressed air D. rush/diesel oil

8. Before “stand by” is rung on the engine telegraph, it is usual to give the main diesel engine a brief

trial ______ahead and astern.

A. with power B. on power C. with air D. on air

9. A number of cylinder liners are enclosed in one cast iron casing to form a ______.

A. cylinder cover B. cylinder block C. crankcase D. bed-plate

10. Between the periods of injection and ignition of the fuel, a diesel engine crankshaft rotates through

the ______.

A. detonation period B. firing period C. delay period D. advance period 11. The turbo-blower comprises a gas turbine and a ______.

A. condenser B. blower C. soot blower D. air receiver

12. Vessel propellers are classified as being right hand or left hand. A right hand propeller turns

clockwise when viewed from ______.

A. the bow B. the stern C. the port side D. the starboard side 13. ______the repair in such short time is unknown to us.

A. How they finished B. How did they finished C. That how they finished D. That how did they finished 14. In a simple mechanical governor, the ______.

A. centrifugal force rotates the ball-head

B. flyweight centrifugal force is balanced by spring force

C. flyweight centrifugal force is balanced by hydraulic pressure D. speeder spring alone actuates the fuel control rod 15. Wear in a cylinder liner is usually due to ______.

A. friction B. abrasion C. corrosion D. all of the above 16. A governor automatically controls engine speed by regulating ______.

A. fuel supply B. firing order C. engine load D. oil level

17. If the viscosity of the liquid being transferred remains constant as the discharge pressure increases,

the rotary pump ______.

A. capacity will increase B. capacity will decrease

C. suction pressure will increase D. suction pressure will decrease 18. The purpose of the wearing rings used in a centrifugal pump is to ______.

A. prevent an internal explosion in the pump when it is overheated B. enable a visual inspection of the pump while it is running C. insure a proper alignment of the pump coupling to the driver D. accommodate for friction between the impeller and the casing

19. When a boiler is operating, the water level in the gauge glass reads ______when the boiler is shut

down.

A. lower than B. higher than C. as much as D. the same as

20. The concentration of total dissolved soli …… 此处隐藏：5033字，全部文档内容请下载后查看。喜欢就下载吧 ……