單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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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Most pump manufacturers recommend that the suction piping dimension for centrifugal pumps be （）.

你可能感興趣的試題

In the operation of a flash type evaporator equipped with air ejectors,the air and non- condensable gases are evacuated directly from the （）.

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 （）.

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 （）.