單項(xiàng)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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1.單項(xiàng)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

2.單項(xiàng)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

3.單項(xiàng)選擇題In an electro-hydraulic steering gear system, when will the variable displacement pump be placed on stroke?（）

A.When the helm is at any angle other than amidships
B.When the six-way valve is opened
C.When the ram relief valves lift
D.When the redder angle is different from the position of the helm

4.單項(xiàng)選擇題An additive used to improve the ability of a lube oil to reduce friction is known as a/an （）.

A.suppressant additive
B.dispersant additive
C.extreme pressure additive
D.viscosity improver additive

5.單項(xiàng)選擇題The suction - force principle of operation is a typical characteristic of （）.

A.centrifugal pumps
B.jet pumps
C.propeller pumps
D.reciprocating pumps