A.cutout
B.controller switch
C.pressure controller
D.cutout switch
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A.evaporator
B.compressor
C.condenser
D.none of the above
A.nonexistent
B.for controlling pressure
C.for controlling superheat
D.for controlling the solenoid valve
A.compressor
B.condenser
C.throttle valve
D.evaporator
A.open-type
B.hermetic
C.semi-hermetic
D.all the above
Which of the following will be desirable properties of refrigerant?（）
(1) non-explosive
(2) non-corrosive
(3) that it doesn’t react with lubricants
A.(1), (2) and (3)
B.(1) and (2)
C.(1) and (3)
D.(2) and (3)
最新試題
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.
Which of the following statements is correct concerning heat transfer?（）
A salinity indicator is used to determine the （）.
A salinity indicator is used to determine the （）.
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 （）.
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will （）.
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
The usual symptoms of cavitation in a centrifugal pump is （）.
The output volume of a positive fixed displacement pump can be changed only by （）.