單項(xiàng)選擇題If the temperature in the icebox is too high, the trouble could be()

A.a clogged scale trap
B.air in the system
C.automatic controls not functioning properly
D.insufficient cooling water to the condenser


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1.單項(xiàng)選擇題Air or noncondensable gas is removed from a refrigeration system by a ()

A.separating chamber
B.system of baffles
C.purge valve
D.vacuum reducing valve

2.單項(xiàng)選擇題Where are the zinc plates located?()

A.saltwater side of the condenser
B.refrigerant side of the condenser
C.in the evaporator coils
D.in the suction strainer

3.單項(xiàng)選擇題The device used for low-pressure control and high-pressure cutout on a compressor is called a()

A.cutout
B.pressure controller
C.controller switch
D.cutout switch

4.單項(xiàng)選擇題The purpose of the purge valve at the top of the condenser in a refrigerating system is to()

A.remove any air that may accumulate in the system
B.take out unpleasant fumes from the refrigerant
C.vent off excess refrigerant in an emergency
D.permit opening the refrigerating system for cleaning and inspecting

5.單項(xiàng)選擇題What is the purpose of sub cooling R-12 in the condenser?()

A.to increase the system efficiency by sensible heat transfer
B.to stop the liquid from flashing
C.to reduce the load on the compressor
D.to remove latent heat of vaporization and the suction piping transfer

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