某些新型大型低速柴油机的气缸盖上，设有用来拆卸缸盖螺帽的液压

【名词&注释】

液压油(hydraulic oil)、低速柴油机(low speed diesel engine)

[单选题]某些新型大型低速柴油机的气缸盖上，设有用来拆卸缸盖螺帽的液压装置（液压环）和配备了专用环形六角扳手，该扳手的作用是（）。

A. 通入液压油时，用来松紧缸盖螺帽
B. 液压装置失效时，用来松开缸盖螺帽
C. 液压装置失效时，用来上紧缸盖螺帽
D. 通入液压油时，用来松紧缸盖螺帽和液压装置失效时，用来上紧缸盖螺帽

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学习资料：

[单选题]早期故障是在使用开始后，因为（）而产生的故障。Ⅰ.设计与制造缺陷；Ⅱ.磨合不当；Ⅲ.维修不当

A. 仅Ⅰ对
B. Ⅰ+Ⅱ
C. Ⅰ+Ⅲ
D. Ⅰ+Ⅱ+Ⅲ

[单选题]High-speed rotating in a centrifugal purifier can produce a force （） larger than the force of gravity.

A. many thousand times
B. between times
C. one time
D. at time

[单选题]Pistons of marine medium speed diesel engines may be made of （） in order to keep the weight down for balancing purpose at high speed.

A. lead
B. forged steel
C. alloy steel
D. aluminum alloy

[单选题]The quantity of oil injected into the cylinder can be regulated （）.

A. by turning the pump plunger
B. by vary the fuel valve spring force
C. by no means by controlling the governor
D. by enlarging or diminishing the injection hole

[单选题]Which of the following conditions can cause above normal air temperature to develop in the intake manifold of a four-stroke/cycle turbo-charged diesel engine?（）

A. Clogged air intake falters
B. Piston blow-by
C. A defective after-cooler
D. Faulty exhaust valve

[单选题]A diesel engine is operating with excessively high exhaust temperatures at all cylindersTo correct this condition, you should FIRST （）.

A. reduce the engine load
B. increase the cooling water flow
C. increase the lube oil pressure
D. adjust the fuel rack

[单选题]On a twin-screw，twin-rudder vessel，the most effective way to turn in your own water，with no way on，is to put（）.

A. one engine ahead and one engine astern，with full rudder
B. one engine ahead and one engine astern，with rudders amidships
C. both engines ahead，with full rudder
D. both engines astern，with full rudder

[单选题]The engine in a covered lifeboat is fueled with（）.

A. kerosene
B. unleaded gasoline
C. diesel oil
D. liquefied ga

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