Allied & ICAR Exam Bank • ALLIED_0607 MCQ • 1 Mark

Section 6: Agricultural Process Engineering

Psychrometry and Grain Drying

Subtopic: Psychrometry and Grain Drying

Question Statement:

In thin-layer grain drying, the drying rate is governed by:

Options:

  • (A) Internal moisture diffusion from the kernel interior to the surface (falling rate period)
  • (B) Free water surface evaporation at constant rate
  • (C) Boiling at atmospheric pressure
  • (D) External air turbulence only

Answer Key:

A

Step-by-Step Solution & Explanation

Except for very wet grain, grain drying occurs almost exclusively in the falling rate drying period governed by Fickian moisture diffusion within the kernel.
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