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Heat Transfer - Interview Questions and Answers

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86. Depending on the radiating properties, body will be transparent when
A. p = 0, x = 0 and a = 1
B. p=l,x = 0, and a = 0
C. p = 0, T= l, and a = 0
D. X = 0, a + p = 1
E. a = 0,x + p= 1.
Explanation:
87. If the temperature of a solid surface changes form 27�C to 627�C, then its emissive power changes in the ratio of
A. 3
B. 6
C. 9
D. 27
E. 81.
Explanation:
88. Absorptivity of a body will be equal to its emissivity
A. at all temperatures
B. at one particular temperature
C. when system is under thermal equiplibrium
D. at critical temperature
E. for a polished body.
Explanation:
89. Unit of thermal conductivity in S.I. units is
A. J/m2 sec
B. J/m �K sec
C. W/m �K
D. (a) and (c) above
E. (b) and (c) above.
Explanation:
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