单项选择题

Constant superheat is maintained at the evaporator outlet of a refrigeration coil by a（）

A.solenoid valve
B.low pressure cutout switch
C.king valve
D.thermal expansion valve

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单项选择题

Hot gas bypass is one of the methods used to （）

A.relieve excessive compressor head pressure
B.produce flash gas at the expansion valve
C.reduce flooding of the receiver at low load
D.defrost the evaporator coils

单项选择题

Thermostatic expansion valves can be adjusted for （）

A.suction pressure only
B.head pressure only
C.superheat only
D.suction pressure and box temperature

单项选择题

The receiver used in a refrigeration system（）

A.stores liquid refrigerant
B.collects non-condensable gases
C.allows refrigerant sub-cooling
D.prevents compressor surging