單項選擇題

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

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單項選擇題

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

單項選擇題

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