Question Bank • QB_SUB_DFE_TRC_001 MCQ • 1 Mark

Section 7: Dairy and Food Engineering

Transient Heat Conduction & Lumped Capacity Analysis

Subtopic: Biot number calculation for spherical fruit

Question Statement:

The physical significance of the Biot number ($Bi$) in heat conduction is the ratio of:

Options:

  • (A) Internal conductive resistance to surface convective resistance
  • (B) Buoyancy force to viscous force
  • (C) Inertial force to surface tension force
  • (D) Thermal boundary layer thickness to velocity boundary layer thickness

Answer Key:

A

Step-by-Step Solution & Explanation

$Bi = \frac{L_c / k}{1 / h} = \frac{\text{Internal conductive resistance}}{\text{External convective resistance}}$.
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