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Heat Transfer - Interview Questions and Answers

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61. The energy distribution of an ideal reflector at higher temperatures is largely in the range of
A. shorter wavelength
B. longer wavelength
C. remains same at all wavelengths
D. wavelength has nothing to do with it
E. none of the above.
Explanation:
62. The value of Portland number for air is about
A. 0.1
B. 0.3
C. 0.7
D. 1.7
E. 10.5.
Explanation:
63. The value of the wavelength for maximum emissive power is given by
A. Wien's law
B. Planck's law
C. Stefan's law
D. Fourier's law
E. Kirchhoff's law.
Explanation:
64. All radiations in a black body are
A. reflected
B. refracted
C. transmitted
D. absorbed
E. partly reflected and partly absorbed.
Explanation:
65. The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as
A. Krichoff's law
B. Stefan's law
C. Wien' law
D. Planck's law
E. Black body law.
Explanation:
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