單項(xiàng)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

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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

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