A.air compressor
B.refrigeration compressor
C.vacuum pump
D.purifier
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A.boiling off
B.flash evaporation
C.condensation
D.none of the above
A.to cut down the amount of cooling water needed
B.to prevent an excess amount of cooling water from being discharged to the bilges
C.to supply hot water to the evaporator for more economical operation
D.None of the above is tree
A.to decrease scale formation
B.for better cooling effect
C.for more economical purpose
D.to raise vacuum
A.a brine pump
B.an air ejector
C.a feed water pump
D.a condensate pump
A.a brine pump
B.an air ejector
C.a feed pump
D.distillate pump
最新試題
If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
Thermostatic expansion valves can be adjusted for （）.
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will （）.
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
The rate of heat transfer from a hot region to a cold region is affected most by the （）.
A pressure drop through the refrigerant liquid line may cause （）.
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.
The general purpose of a heat exchanger is to （）.