单项选择题X 纠错
A.motor controller overload would open
B.pump would eventually overheat
C.relief valve would continuously cycle open
D.motor would overheat
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单项选择题
A.have a greater head capacity
B.operate with increased impeller efficiency
C.discharge through the suction side of the pump casing
D.require more power to run the shaft
单项选择题
A.hydraulic fluid contamination
B.excessive fluid friction
C.turbulent fluid flow
D.fluid pressure surges
单项选择题
A.yearly
B.quarterly
C.monthly
D.daily
单项选择题
A.evaporator pressure decrease
B.evaporator coil over-feed
C.evaporator capacity increase
D.expansion valve diaphragm rupture
单项选择题
A.head capacity to improve
B.discharge to be reversed
C.efficiency to decrease
D.slippage to decrease
单项选择题
A.gums, acids, and varnishes
B.removed by cellulose type filters
C.neutralized by oil additives
D.not removed by absorbent filters
单项选择题
A.repack all valve stems
B.lubricate it prior to use
C.replace the foundation bolts
D.balance the warping heads
单项选择题
A.blue
B.green
C.orange
D.purple
单项选择题
A.blue
B.green
C.orange
D.purple
单项选择题
A.excessive condenser cooling water
B.warm food in the refrigerator
C.a shortage of refrigerant
D.s shortage of compressor oil