单项选择题

The emergency bilge suction valve is typically used （）.

A.to inject cleaning additives when the bilges are extremely dirty
B.when the main condenser becomes fouled, in order to provide additional cooling water circulation
C.to connect the rose box to the independent bilge suction
D.if the bilges become flooded and they can not be emptied by any other means

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单项选择题

Short cycling of a refrigeration compressor refers to （）.

A.frequently grounding out
B.frequently starting and stopping
C.running too fast
D.running too slow

单项选择题

When a flash-type evaporator is to be secured for an extended period of time, the entire unit should be drained, cleaned, and （）.

A.completely filled with saltwater
B.filled with de-scaling compound
C.tightly closed to exclude air
D.vented to the atmosphere

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Condensate must be drained periodically from the air compressor receivers to prevent （）.

A.second stage cylinder lockup
B.oil sump contamination
C.faulty operation of pneumatic valves
D.corrosion of air receiver baffles