單項(xiàng)選擇題

In which of the listed hydraulic systems will the installation of an oil cooler be necessary?（）

A.Constant tension mooring winch system
B.Hatch cover system
C.Watertight door system
D.Internal combustion engine hydraulic starter system

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單項(xiàng)選擇題

Which of the following problems would be the probable cause for the faulty operation of a reciprocating air compressor suction valve?（）

A.Carbon build up in the piston ring belt
B.Faulty operation of a cylinder un-loader
C.Compressor operation in an area of high relative humidity
D.Lifting of intercooler rebel valve

單項(xiàng)選擇題

If a refrigeration crankcase compressor were short cycling on the low pressure cutout switch, the cause might be that the （）.

A.system was overcharged with refrigerant
B.system was low on refrigerant
C.suction valves were leaking slightly
D.relief valve was leaking slightly