单项选择题
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
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相关考题
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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 -
单项选择题
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 -
单项选择题
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
