Allied & ICAR Exam Bank • ALLIED_1346 MCQ • 1 Mark

Section 7: Dairy and Food Engineering

Heat and Mass Transfer in Food Processing

Subtopic: Biot Number for Food

Question Statement:

In unsteady-state cooling of small particulate food bodies, the lumped capacitance thermal method is valid when the Biot number satisfies:

Options:

  • (A) Bi < 0.1
  • (B) Bi > 10
  • (C) Bi = 1.0
  • (D) Bi > 100

Answer Key:

A

Step-by-Step Solution & Explanation

When $Bi = \frac{h L_c}{k} < 0.1$, conductive internal resistance is negligible compared to surface convection, rendering temperature virtually uniform throughout the solid body.
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