單項(xiàng)選擇題

The unloading system on an air compressor will （）.

A.increase compressor discharge pressure on demand
B.increase compressor operating speed as necessary
C.allow the motor to turn the compressor opposed only by friction
D.reduce the compressor frictional load when starting

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單項(xiàng)選擇題

Which of the listed methods of heat transfer takes place when two substances of different temperatures are in physical contact with each other?（）

A.Radiation
B.Conduction
C.Convection
D.Each of the above

單項(xiàng)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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The unloading system on an air compressor will （）.

你可能感興趣的試題

Which of the listed methods of heat transfer takes place when two substances of different temperatures are in physical contact with each other?（）

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