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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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