單項(xiàng)選擇題

Condensate must be drained from the intercooler and after-coolers of an air compressor because （）.

A.the cooling effect of the condensate reduces the compressors efficiency
B.a danger of explosion exists whenever water is present in a compressor
C.water causes erratic operation of pneumatic components
D.the volumetric capacity of the first stage is reduced if water remains

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單項(xiàng)選擇題

In the refrigeration system, a shortage of refrigerant is indicated by （）.

A.the compressor short cycling on high pressure cut out switch
B.high suction pressure
C.high head pressure
D.bubbles in the sight glass

單項(xiàng)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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Condensate must be drained from the intercooler and after-coolers of an air compressor because （）.

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In the refrigeration system, a shortage of refrigerant is indicated by （）.

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