单项选择题

In which of the listed refrigeration system components does superheating of the refrigerant take place?（）

A.Expansion valve
B.Evaporator
C.Drier
D.Receiver

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单项选择题

Excessive lube oil consumption by a reciprocating air compressor can be caused by （）.

A.using a slightly dirty air filter
B.using oil having an excessive viscosity
C.intercooler or after-cooler leaks
D.carrying the oil level higher than normal

单项选择题

The effect of high vapor superheat in a refrigeration system, is a/an （）.

A.increased capacity of the compressor
B.more efficient operation of the thermal expansion valve
C.decreased capacity of the compressor
D.loss of receiver capacity

单项选择题

A dirty intercooler on an air compressor will cause （）.

A.damage to the un-loader operating diaphragm
B.an increase in current flow to the motor
C.high pressure in the receiver and filter
D.an excessive consumption of crankcase oil