單項選擇題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


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1.單項選擇題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

2.單項選擇題If the pump for a hydraulic anchor windlass is over heating, the cause may be （）.

A.increased pump speed
B.excessive pump discharge pressure
C.too low of a tilting box angle
D.low pump speed

3.單項選擇題Which of the problems listed represents the major difficulty encountered with thermal expansion valve operation?（）

A.Lube oil passing through the system
B.Moisture or foreign matter collecting at the valve seat and orifice
C.Variable spring tension caused by the changing temperature
D.Frost on the liquid line

4.單項選擇題Broken valve strips in an operating low pressure, air compressor will cause （）.

A.an immediate crankcase explosion
B.oil contamination in the compressed air
C.a decrease in compressor capacity
D.no immediate loss of the compressed air capacity

5.單項選擇題Which of the listed operating conditions would have the greatest effect on the volumetric efficiency of an operating reciprocating air compressor?（）

A.The density of the air entering the compressor
B.The temperature of the air entering the compressor
C.The designed rotating speed of the compressor
D.A leaking head gasket