单项选择题
Sludge may form in the crankcase of an air conditioning compressor as a result of （）.
A.bubbling refrigerant
B.overheating and oxidation
C.lowered operating temperatures
D.reducing the cloud or flash point
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相关考题
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单项选择题
Which of the following centrifugal pump components converts the liquid kinetic energy of velocity to the potential energy of pressure?（）
A.Impeller
B.Electric motor
C.Volute
D.Eye -
单项选择题
Excessive circulation of the lubricating oil with the refrigerant in a refrigeration system will cause （）.
A.carbon deposits on the compressor suction valves
B.the evaporator temperature to increase
C.rapid corrosion of the thermal expansion valve
D.no operating problems -
单项选择题
Scale accumulation on evaporator heat exchange surfaces （）.
A.increases brine density
B.increases distillate salinity
C.reduces metal corrosion
D.reduces heat transfer
