單項選擇題The expansion valve on a Freon system controls the ().

A.superheat of the gas leaving the compressor
B.back pressure in the evaporator
C.temperature of the icebox
D.superheat of the gas leaving the evaporator


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1.單項選擇題During working, thermostatic expansion valve should be ().

A.either all the way open or all the way closed
B.normally fully open
C.throttled depending on load
D.controlled by liquefied pressure

3.單項選擇題The thermal expansion valve controls the amount of refrigerant that is allowed to flow to the ().

A.compressor
B.cooling coils
C.condenser
D.receiver

4.單項選擇題The compressor suction line conveys the refrigerant vapor from () to ().

A.condenser;evaporator
B.evaporator;compressor
C.compressor;condenser
D.None of the above

5.單項選擇題Both the temperature and the pressure of the refrigerant are increased in the ().

A.compressor
B.condenser
C.evaporator
D.expansion valve