單項選擇題If a hydraulic pump is overheating, the cause may be （）.

A.excessive internal leakage in the pump
B.low discharge pressure and fluid flow
C.excessive fluid level in the hydraulic reservoir
D.operation of the pump at 100% efficiency


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1.單項選擇題The motor for the fresh water pump （）.

A.need to repair
B.need to be repaired
C.needs to repair
D.needs repairing

2.單項選擇題I remember （）the oil separator the day before yesterday But it failed again.

A.to repair
B.to be repaired
C.repairing
D.being repaired

4.單項選擇題The clutch band of a constant tensioning mooring winch must be set up tight enough to drive the winch drum and should slip only when （）.

A.excessive loads are placed on the winch
B.minimum pull is being exerted by the winch
C.automatic operation of the winch is desired
D.wire is being retrieved at the maximum rate

5.單項選擇題The advantages of flash type evaporators, as compared to submerged tube type evaporators, include （）.

A.less internal corrosion because of lower brine density
B.higher temperature evaporation for lower salinity of the distillate produced
C.less scale formation in a flash evaporator
D.less feed-water required for a flash evaporator