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

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單項(xiàng)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

單項(xiàng)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

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

你可能感興趣的試題

If the pump for a hydraulic anchor windlass is over heating, the cause may be （）.

Which of the problems listed represents the major difficulty encountered with thermal expansion valve operation?（）