单项选择题
Most pump manufacturers recommend that the suction piping dimension for centrifugal pumps be （）.
A.one size smaller than the pump suction nozzle
B.the same size as the pump suction nozzle
C.one size larger than the pump suction nozzle
D.installed with a short radius elbow at the pump
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相关考题
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单项选择题
In the operation of a flash type evaporator equipped with air ejectors,the air and non- condensable gases are evacuated directly from the （）.
A.first stage flash chamber
B.second stage flash chamber
C.first stage after condenser
D.second stage distilling condenser -
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 -
单项选择题
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
