單項選擇題Before charging a refrigeration unit, the refrigerant charging lines should be()

A.flushed with clean refrigerant oil
B.purged with the refrigerant
C.washed with an ammonia and alcohol solution
D.grounded to compressor


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1.單項選擇題In the presence of an open flame or hot surfaces, chlorinated fluorocarbon refrigerants decomposes and from ().

A.petroleum crystals
B.phosgene gas
C.water vapor
D.carbon monoxide

2.單項選擇題In an operating refrigeration system low on refrigerant, a liquid line sight glass will()

A.be clear
B.be blue
C.be light green
D.show bubbles

3.單項選擇題The thermal expansion valve reacts directly to the ()

A.temperature in the space being cooled
B.liquid refrigerant pressure at the solenoid valve
C.pressure drop across the evaporator coils
D.refrigerant gas superheat at the coil outlet

4.單項選擇題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

5.單項選擇題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