單項(xiàng)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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1.單項(xiàng)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

2.單項(xiàng)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

3.單項(xiàng)選擇題Low pressure air is usually taken through () or pressure regulators to a low pressure reservoir supplying a ring main through driers.

A.globe valves
B.butterfly valves
C.gate valves
D.reducing valves

5.單項(xiàng)選擇題Explosions do occur () caused by the ignition of oil or vapour gaining access from compressors or defective engine starting valves.

A.in boiler drums
B.in refrigerating plants
C.in starting air pipes
D.in air coolers