Allied & ICAR Exam Bank • ALLIED_0697 MCQ • 1 Mark

Section 7: Dairy and Food Engineering

Heat and Mass Transfer in Food Processing

Subtopic: Heat and Mass Transfer in Food Processing

Question Statement:

Fick's first law of steady-state molecular mass diffusion of water in a food slab states that mass flux $J_A$ is proportional to:

Options:

  • (A) The concentration gradient of the diffusing species ($J_A = -D_{AB} \frac{dC_A}{dx}$)
  • (B) Temperature gradient only
  • (C) The square of moisture content
  • (D) Atmospheric pressure

Answer Key:

A

Step-by-Step Solution & Explanation

Fick's first law states $J_A = -D_{AB} \frac{dC_A}{dx}$, where $D_{AB}$ is mass diffusivity.
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