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Heat Transfer - Interview Questions and Answers

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56. Thermal conductivity of air at room temperature in kcal/m hr �C is of the order of
A. 0.002
B. 0.02
C. 0.01
D. 0.1
E. 0.5.
Explanation:
57. According to Stefan's law, the total radiation from a black body per second per unit area is proportional to
A. absolute temperature
B. T2
C. T5
D. t
E. l/T.
Explanation:
58. The unit of Stefan Boltzmann constant is
A. watt/cm2 �K
B. watt/cm4 �K
C. watt2/cm �K4
D. watt/cm2 �K4
E. watt/cm2 �K2.
Explanation:
59. Total emissivity of polished silver compared to black body is
A. same
B. higher
C. more or less same
D. very much lower
E. very much higher.
Explanation:
60. A steam pipe is to be insulated by two insulating materials put over each other. For best results
A. better insulation should be put over pipe and better one over it
B. inferior insulation should be put over pipe and better one over it
C. both may be put in any order
D. whether to put inferior OIL over pipe or the better one would depend on steam temperature
E. unpredictable.
Explanation:
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