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

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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

单项选择题

The purpose of the refrigeration system low pressure cutout switch is to （）

A.protect the compressor from liquid flood back
B.protect the compressor from low discharge pressure
C.start and stop the compressor upon system demand
D.start the compressor after a drop in the evaporator pressure

单项选择题

A pressure drop in the liquid line of a refrigeration system may cause（）

A.the solenoid valve to seize
B.the compressor to hunt
C.flash gas to form in the liquid line
D.the expansion valve to freeze open