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

A.increased pump speed
B.excessive pump discharge pressure
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Which of the problems listed represents the major difficulty encountered with thermal expansion valve operation?（）

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Broken valve strips in an operating low pressure, air compressor will cause （）.

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C.a decrease in compressor capacity
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