Heat Transfer - Interview Questions | Exam2Win

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41. Thermal conductivity of glass-wool varies from sample to sample because of variation in

A. composition

B. density

C. porosity

D. structure

E. all of the above.

Explanation:

42. Moisture would find its way into insulation by vapour pressure unless it is prevented by

A. high thickness of insulation

B. high vapour pressure

C. less thermal conductivity insulator

D. a vapour seal

E. all of the above.

Explanation:

43. The amount of heat flow through a body by conduction is

A. directly proportional to the surface area of the body

B. directly proportional to the temperature difference on the two faces of the body

C. dependent upon the material of the body

D. inversely proportional to the thickness of the body

E. all of the above.

Explanation:

44. Thermal diffusivity of a substance is .

A. proportional of thermal conductivity

B. inversely proportional to k

C. proportional to (kf

D. inversely proportional to k2

E. none of the above.

Explanation:

45. Thermal conductivity of air with rise in temperature

A. increases

B. decreases

C. remains constant

D. may increase or decrease depending on temperature

E. none of the above.

Explanation:

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