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單項選擇題

During compressors running the accumulated moisture in the separators must be （）.

A.drained off
B.collected
C.sent to the crankcases
D.separated with oil

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單項選擇題

By far the greatest use is for diesel engine starting using air pressure of 25 bar or more provided by （）.

A.rotary compressors
B.reciprocating compressors
C.centrifugal compressors
D.screw compressors

單項選擇題

Compressed air is used on board ship for all the following purposes except （）.

A.starting diesel engines
B.pneumatic control systems
C.pneumatic tools
D.supercharging air