单项选择题
A.first stage flash chamber B.second stage flash chamber C.first stage after condenser D.second stage distilling condenser
The refrigeration compressor in a water cooled refriger...
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
Excessively low air pressure occurring in the intercool...
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
Most pump manufacturers recommended that the discharge ...
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 C.one size smaller than the pump discharge nozzle D.installed with a short radius elbow at the pump
