Question Bank • QB_SUB_APE_0039 MCQ • 1 Mark

Section 6: Agricultural Process Engineering

Size Reduction and Material Handling

Subtopic: Cleaning and grading

Question Statement:

In a pneumatic aspirator or winnowing column, seed cleaning is achieved based on differences in:

Options:

  • (A) Aerodynamic terminal velocity ($v_t$) of grain versus chaff/dust
  • (B) Dielectric constant of grains
  • (C) Thermal conductivity
  • (D) Optical reflectance under UV light

Answer Key:

A

Step-by-Step Solution & Explanation

Pneumatic separation balances aerodynamic drag and gravity: particles with terminal velocity lower than upward air velocity are entrained and carried away.
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