单项选择题
A.solenoid valve B.low pressure cutout switch C.king valve D.thermal expansion valve
Hot gas bypass is one of the methods used to （）A.reliev...
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
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
