單項(xiàng)選擇題

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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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

單項(xiàng)選擇題

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