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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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
A.dehydration
B.condensation
C.evaporation
D.dissolution
A.evaporation
B.distillation
C.dehydration
D.condensation
A.in the chill box
B.before the receiver
C.on the suction side of the compressor
D.on the discharge side of the compressor
A.High conductivity of the distillate indicates distillate salinity is excessive
B.Increasing the absolute pressure of the shell will increase the distillers capacity
C.Mesh separators are used in evaporators to filter the distillate
D.Reducing the brine density will reduce the heat lost overboard
最新試題
A grease gun is generally used to lubricate a （）.
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
A pressure drop through the refrigerant liquid line may cause （）.
Which of the following statements is correct concerning heat transfer?（）
Low compressor head pressure in a refrigeration system can be caused by（）.
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.
The rate of heat transfer from a hot region to a cold region is affected most by the （）.
The major source of chemical contaminants in hydraulic fluid is （）.