单项选择题
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
Under normal operating conditions, the highest temperat...
单项选择题Under normal operating conditions, the highest temperature and pressure conditions existing in a flash-type evaporator will occur in the （）.
A.first stage B.second stage C.distillate cooler D.salt water feed heater
