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Total Questions : 72 | Page 8 of 8 pages
Question 71. Freezer is at -18 °C. Will will be Radiative heat transfer if meat is at 298k, its emissivity is 0.82 and average area is 0.045m².
Either use Stefan Boltzmann law or take hᵣ (radiative heat transfer co-efficient) as 0.227.
ε = ( Tₐᵥ/100 )³
  1.    7.61
  2.    6.94
  3.    8.43
  4.    None of the mentioned
 Discuss Question
Answer: Option A. -> 7.61
Answer: (a).7.61
Question 72. A food industry keeps food cool in a very crude manner, by radiation. It paints its walls white and not black, because of _____
  1.    Kirchhoff’s Law
  2.    Stephan-Boltzmann Law
  3.    Kirchhoff’s Law & Stephan-Boltzmann Law
  4.    None of the mentioned
 Discuss Question
Answer: Option A. -> Kirchhoff’s Law
Answer: (a).Kirchhoff’s Law

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