單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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

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