Question Bank • QB_DFE_EXP_009 MCQ • 1 Mark

Section 7: Dairy and Food Engineering

Heat and Mass Transfer

Subtopic: Steady state heat transfer in conduction, convection and radiation

Question Statement:

In thermal radiation, Stefan-Boltzmann law states that total emissive power ($E_b$) of a blackbody is directly proportional to:

Options:

  • (A) $T^4$ (fourth power of absolute temperature)
  • (B) $T^2$ (square of absolute temperature)
  • (C) $T$ (absolute temperature)
  • (D) $T^3$

Answer Key:

A

Step-by-Step Solution & Explanation

Stefan-Boltzmann law: $E_b = \sigma T^4$, where $\sigma = 5.67 \times 10^{-8}\text{ W/(m}^2\cdot\text{K}^4)$ and $T$ is in Kelvin.
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