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單項選擇題

The heat used to change a liquid to a vapor is called （）.

A.latent heat of fusion
B.latent heat of vaporization
C.specific heat of vaporization
D.latent heat of the gas

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單項選擇題

The （） compressor and its electrical motor are entirely housed in a gas-tight casing.

A.open-type
B.hermetic
C.A and B
D.None of the above

單項選擇題

In a compression refrigeration plant the refrigerant flows from the expansion valve and through the （） where it absorbs heat from the space being cooled and becomes a gas or vapor.

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

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