單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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