海船船员考试题库2022船舶动力装置题库专项练习每日一练(09月06日)

1. [单选题]废气锅炉小的烟垢着火，对锅炉危害（），在一定条件下可发展为（），导致废气锅炉（）。

A. 不大/高温着火/损坏
B. 很大/高温着火/损坏
C. 不大/大的烟垢着火/爆炸
D. 很大/安全阀放汽/爆炸

2. [单选题]Compressed air is used on board ship （）.

A. for starting diesel engines
B. in pneumatic control system
C. in pneumatic tools
D. All the above are true

3. [单选题]The crankshaft of diesel engine is supported by （）.

A. tension stretch
B. tie rods
C. through bolts
D. main bearing

4. [单选题]Excessive vibration of an automatically fired auxiliary boiler can be caused by （）

A. air or water in the furnace
B. combustion pulses
C. fuel oil pump failure
D. flame failure

5. [单选题]A diesel engine piston ring face is in direct contact with the （）.

A. top of the ring groove
B. cylinder liner oil film
C. bottom of the ring groove
D. back of the ring groove

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