單項(xiàng)選擇題

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

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單項(xiàng)選擇題

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
C.one size smaller than the pump discharge nozzle
D.installed with a short radius elbow at the pump

單項(xiàng)選擇題

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

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Excessively low air pressure occurring in the intercooler of a reciprocating air compressor is caused by（）.

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Most pump manufacturers recommended that the discharge piping for centrifugal pumps be （）.

If a refrigeration compressor is short cycling on high head pressure, you should （）.