单项选择题
Air compressor receivers should be “blown down” at least （）.
A.yearly
B.quarterly
C.monthly
D.daily
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单项选择题
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 -
单项选择题
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
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单项选择题
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
