单项选择题
Condensate must be drained periodically from the air compressor receivers to prevent （）.
A.second stage cylinder lockup
B.oil sump contamination
C.faulty operation of pneumatic valves
D.corrosion of air receiver baffles
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相关考题
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单项选择题
Overheating of a hydraulic system may be a result of （）.
A.changing pump discharge pressure in response to normal load variations
B.a high oil level
C.incorrect fluid viscosity
D.continued slow re-circulation of the oil -
单项选择题
The purpose of the low pressure cut-out switch is to （）.
A.maintain liquid refrigerant at the suction of the compressor
B.maintain a preset suction pressure to the compressor
C.start and stop the compressor at preset operating pressures
D.operate at minimum efficiency -
单项选择题
The process of boiling seawater in order to separate it into freshwater vapor and brine is usually defined as （）.
A.dehydration
B.condensation
C.evaporation
D.dissolution
