單項(xiàng)選擇題One function of the thermal expansion valve is to()

A.act as a pilot from the solenoid valve
B.regulate the amount of refrigerant flow to the coil
C.regulate the water flow
D.turn the compressor off and on


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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題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

3.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

4.單項(xiàng)選擇題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

5.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