單項選擇題

Which of the following conditions must exist for heat to flow from one object to another?（）

A.The two objects must be in physical contact
B.The two objects must be the same size
C.There must be an existing temperature differential
D.There must be an existing weight differential

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單項選擇題

A warmer than normal compressor suction line might be caused by （）.

A.insufficient lubrication
B.insufficient refrigerant
C.excess refrigerant
D.excessive opening of the expansion valve

單項選擇題

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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Which of the following conditions must exist for heat to flow from one object to another?（）

你可能感興趣的試題

A warmer than normal compressor suction line might be caused by （）.

The unloading system on an air compressor will （）.