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
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
The major source of chemical contaminants in hydraulic fluid is （）.
A grease gun is generally used to lubricate a （）.
The usual symptoms of cavitation in a centrifugal pump is （）.
When the steering gear is in operation, you should （）.
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.
The output volume of a positive fixed displacement pump can be changed only by （）.
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will （）.
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.