A.compressor
B.condenser
C.throttle valve
D.evaporator
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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)
A.saturated
B.super-cooled
C.wet
D.superheated
A.extracts
B.releases
C.gives no
D.absorbs no
A.vapor
B.liquid
C.solid
D.None of the above is tree
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When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
If you are given the job of adding hydraulic fluid to a mooring winch, and are not certain as to the type of fluid to use, 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 （）.
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
The output volume of a positive fixed displacement pump can be changed only by （）.
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
Which of the listed pumps is NOT a positive displacement pump?（）
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
Thermostatic expansion valves can be adjusted for （）.