單項(xiàng)選擇題

A feeler or thermal bulb is used for the expansion valve to （）.

A.detect the temperature
B.detect the pressure
C.heat the refrigerant
D.accelerate the refrigerant

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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

單項(xiàng)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