單項選擇題The heat required to change a substance from a liquid to a gas without experiencing a temperature change is defined as the latent heat of （）.

A.fusion
B.vaporization
C.sublimation
D.condensation


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1.單項選擇題Which of the processes listed consumes the greatest amount of power while producing the greatest amount of heat?（）

A.Overcoming sliding friction
B.Overcoming rolling friction
C.Overcoming fluid friction
D.Overcoming oil wedge friction

2.單項選擇題The degree to which the viscosity of an oil will change with a change in temperature is indicated by the （）.

A.weight designation
B.viscosity index
C.pour point
D.thermal change value

4.單項選擇題With reference to a vessel’s structural integrity, the most significant characteristic of a cryogenic liquid is its （）.

A.capability of causing brittle fractures
B.highly corrosive action on mild steel
C.vapor cloud which reacts violently with saltwater
D.toxicity at atmospheric pressure

5.單項選擇題The only means of removing the latent heat of condensation from a refrigerant in the normal refrigeration cycle is by （）.

A.passing it through the expansion valve
B.condensing refrigerant in the system condenser
C.passing the gaseous refrigerant through the heat interchanger on the suction side of the compressor
D.maintaining a high pressure on the systems receiver