Heat Transfer - Interview Questions | Exam2Win

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66. According to Stefan-Boltzmann law, ideal radiators emit radiant energy at a rate proportional to

A. absolute temperature

B. square of temperature

C. fourth power of absolute temperature

D. fourth power of temperature

E. cube of absolute temperature.

Explanation:

67. Thermal conductivity of water at 20�C is of the order of

A. 0.1

B. 0.23

C. 0.42

D. 0.51

E. 0.64.

Explanation:

68. Fourier's law of heat conduction is valid for

A. one dimensional cases only

B. two dimensional cases only

C. three dimensional cases only

D. regular surfaces having non-uniform temperature gradients

E. irregular surfaces.

Explanation:

69. According to Wien's law, the wavelength corresponding to maximum energy is proportion to

A. absolute temperature (T)

B. I2

C. f

D. t

E. 1/r.

Explanation:

70. The thermal diffusivities for solids are generally

A. less than those for gases

B. jess than those for liquids

C. more than those for liquids and gases

D. more or less same as for liquids and gases

E. zerci.

Explanation:

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