单项选择题
A.Expansion valve B.Evaporator C.Drier D.Receiver
Excessive lube oil consumption by a reciprocating air c...
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
The effect of high vapor superheat in a refrigeration s...
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
A dirty intercooler on an air compressor will cause （）....
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
