Allied & ICAR Exam Bank • ALLIED_0683 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:

The lumped capacity heat analysis (uniform internal temperature assumption) is applicable to transient cooling or heating of food items when:

Options:

  • (A) Biot number $Bi < 0.1$
  • (B) Biot number $Bi > 10$
  • (C) Fourier number is zero
  • (D) Reynolds number is turbulent

Answer Key:

A

Step-by-Step Solution & Explanation

When $Bi < 0.1$, internal conductive resistance is negligible (
lt; 5\%$ error), so temperature gradients across the food body can be neglected.
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