單項選擇題If you find an extremely large refrigerant leak while using a halide torch, your flame will（）

A.change from blue to orange
B.‘flare up’ and remain lighted
C.probably go out
D.stay blue


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1.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

2.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

3.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

4.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

5.單項選擇題When transmitted by a reduction gear, diesel engine speed is reduced and the torque available for work （）

A.remains the same
B.is reduced
C.is increased
D.is eliminated