單項選擇題

Under normal operating conditions, the rudder is hydraulically locked unless （）.

A.the manual trick wheel is engaged for steering
B.the variable stroke pump is off stroke
C.a rudder order is given by the control system
D.an electric power system failure occurs at the steering gear

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單項選擇題

Saltwater is typically provided to a refrigeration system to （）.

A.cool the expansion valve
B.prevent refrigerant superheating
C.condense the refrigerant gas
D.prevent motor overheating

單項選擇題

Which of the listed operations will cause an automatically controlled refrigeration compressor to restart?（）

A.Closing of the solenoid valve
B.Closing of the expansion valve
C.An increase in the suction pressure
D.Decreasing the suction pressure

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Under normal operating conditions, the rudder is hydraulically locked unless （）.

你可能感興趣的試題

Saltwater is typically provided to a refrigeration system to （）.

Which of the listed operations will cause an automatically controlled refrigeration compressor to restart?（）