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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1.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

2.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

3.單項(xiàng)選擇題Air blowing from the intake air filter of an operating air compressor indicates （）.

A.broken inlet valves
B.broken discharge valves
C.pulsations in the air distribution system
D.overloading of the air distribution system

4.單項(xiàng)選擇題The part of the anchor windlass that engages the anchor chain for lifting is called the （）.

A.warping head
B.fairlead
C.wildcat
D.capstan

5.單項(xiàng)選擇題If a refrigeration compressor were short cycling on the low pressure cutout switch, the probable cause for this might be the （）.

A.system was overcharged with refrigerant
B.high pressure switch was improperly adjusted
C.expansion valve strainers were fouled
D.suction valves were leaking slightly