单项选择题
The refrigeration compressor in a water cooled refrigeration system is short cycling on the high pressure cutout switch， One reason for this could be the （）.
A.system is low on refrigerant
B.high pressure cutout switch is improperly adjusted
C.discharge valves are leaking slightly
D.discharge valves are leaking excessively
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Excessively low air pressure occurring in the intercooler of a reciprocating air compressor is caused by（）.
A.leaky discharge valves on the LP cylinder
B.leaky discharge valves on the HP cylinder
C.insufficient intercooler cooling
D.low ambient air pressure -
单项选择题
Most pump manufacturers recommended that the discharge piping for centrifugal pumps be （）.
A.one size larger than the pump discharge nozzle
B.the same size as the pump discharge nozzle
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单项选择题
If a refrigeration compressor is short cycling on high head pressure, you should （）.
A.purge the condenser if the waterside is dirty
B.check for proper water flow through the condenser
C.increase the high pressure cutout setting
D.reduce the cooling water flow
