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
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相关考题
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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 -
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
