A.bubbling refrigerant
B.overheating and oxidation
C.lowered operating temperatures
D.reducing the cloud or flash point
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A.Impeller
B.Electric motor
C.Volute
D.Eye
A.carbon deposits on the compressor suction valves
B.the evaporator temperature to increase
C.rapid corrosion of the thermal expansion valve
D.no operating problems
A.increases brine density
B.increases distillate salinity
C.reduces metal corrosion
D.reduces heat transfer
A.positive head
B.negative suction head
C.mechanical seal
D.vent valve attached to the casing at the top of the volute
A.gate valve
B.globe valve
C.check valve
D.plug cock
最新試題
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
When the steering gear is in operation, you should （）.
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.
A salinity indicator is used to determine the （）.
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.
The major source of chemical contaminants in hydraulic fluid is （）.
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.