单项选择题
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
Thermostatic expansion valves can be adjusted for （）A.s...
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
The receiver used in a refrigeration system（）A.stores l...
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
The purpose of the refrigeration system low pressure cu...
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
