单项选择题

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

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单项选择题

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

单项选择题

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

单项选择题

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