The unloading system on an air compressor will _____.
A.increase compressor discharge pressure on demand
B.increase compressor operating speed as necessary
C.allow the motor to turn the compressor opposed only by friction
D.reduce the compressor frictional load when starting
第1题
A.constant
B.pulse
C.high
D.none of the above
第2题
A.generator sets running trial
B.shafting intensity trial
C.the trail for pumps that working for M.E
D.M.E safety devices trial
第3题
A.at any time
B.only after the engine room control station is switched to ‘bridge control’
C.whenever the secondary station is switched to ‘bridge control’
D.whenever the engine side control station is switched to ‘bridge control’
第4题
A.smoky exhaust
B.starting failure
C.overload
D.over speed
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