题目内容
（请给出正确答案）
An un-loader is installed on an air compressor to _____.
A.bypass the high pressure stage to the low pressure stage on 100% of the air compressors in service
B.prevent excessive inter-stage pressure buildup
C.control compressor discharge pressure
D.remove all but the frictional load during starting
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更多“An un-loader is installed on a…”相关的问题
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
A.instruct
B.question
C.interview
D.invest
If an electric motor driven air compressor fails to start, it may be due to a _____.
A.leaking discharge valve
B.jammed suction valve
C.tripped overload relay
D.broken discharge un-loader
Guided Writing Directions: Write an English composition in 120 - 150 words according to the inst
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