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單項選擇題

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

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單項選擇題

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

單項選擇題

Water allowed to accumulate in the hydraulic system oil will cause an oxidation process producing by- products which are normally （）.

A.gums, acids, and varnishes
B.removed by cellulose type filters
C.neutralized by oil additives
D.not removed by absorbent filters