單項選擇題

Which of the conditions listed will cause a refrigeration compressor to run constantly without simultaneously decreasing the temperature in the refrigerated space?（）

A.Shortage of refrigerant oil
B.Slight shortage of refrigerant
C.Excessive condenser cooling water flow
D.Faulty expansion valve

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單項選擇題

Air compressor cylinder un-loaders enable the compressor to （）.

A.vary their speed according to temperature and load
B.start and come up to speed before air compression begins
C.change speed according to overload demands
D.reduce compressed air charge density

單項選擇題

The movement of heat within a fluid, caused by the application of thermal energy, is called （）.

A.radiation
B.conduction
C.convection
D.condo-radiation

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