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單項(xiàng)選擇題

Air compressor receivers should be “blown down” at least （）.

A.yearly
B.quarterly
C.monthly
D.daily

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單項(xiàng)選擇題

A thermostatic expansion valve is properly controlling evaporator superheatAdjusting this valve to lower the superheat will result in a/an （）.

A.evaporator pressure decrease
B.evaporator coil over-feed
C.evaporator capacity increase
D.expansion valve diaphragm rupture

單項(xiàng)選擇題

It is possible to mount a double suction centrifugal pump impeller with the vanes facing in the wrong directionThis would cause the pump （）.

A.head capacity to improve
B.discharge to be reversed
C.efficiency to decrease
D.slippage to decrease