Allied & ICAR Exam Bank • ALLIED_1266 MCQ • 1 Mark

Section 6: Agricultural Process Engineering

Psychrometry and Grain Drying

Subtopic: Equilibrium Moisture Content

Question Statement:

The moisture sorption isotherm of biological grains typically exhibits which characteristic shape according to the IUPAC classification?

Options:

  • (A) Type II (Sigmoidal or S-shaped curve)
  • (B) Type I (Langmuir monolayer)
  • (C) Type III (Anti-Langmuir linear)
  • (D) Strictly horizontal straight line

Answer Key:

A

Step-by-Step Solution & Explanation

Agricultural grains display Type II sigmoidal isotherms comprising monomolecular water binding (low $a_w$), multimolecular adsorption (intermediate $a_w$), and capillary condensation (high $a_w$).
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