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Heat Transfer - Interview Questions and Answers

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71. In counter flow heat exchangers
A. both the fluids at inlet (of heat exchanger where hot fluid enters) are in their coldest state
B. both the fluids at inlet are in their hottest state
C. both the fluids .at exit are in their hottest state
D. one fluid is in hottest state and other in coldest state at inlet
E. any combination is possible depending on design of heat exchanger.
Explanation:
72. Stefan Boltzmann law is applicable for heat transfer by
A. conduction
B. convection
C. radiation
D. conduction and radiation combined
E. convection and radiation combined.
Explanation:
73. A perfect black body is one which
A. is black in colour
B. reflects all heat
C. transmits all heat radiations
D. abslprbs heat radiations of all wave lengths falling on it
E. fully opaque.
Explanation:
74. 40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is
A. 0.45
B. 0.55
C. 0.40
D. 0.75
E. 0.60.
Explanation:
75. Depending on the radiating properties, a body will be black when
A. p = 0, x = 0 and a = 1
B. p= l,T = 0anda = 0
C. p = 0, x = 1 and a = 0
D. x = 0, a + p = 0
E. a = 0,x + p= 1.
Explanation:
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