Allied & ICAR Exam Bank • ALLIED_1257 MCQ • 1 Mark

Section 6: Agricultural Process Engineering

Mechanical Separation and Cleaning

Subtopic: Terminal Velocity

Question Statement:

In pneumatic grain cleaning separators (aspirators), chaff and straw are separated from sound wheat grains primarily based on differences in their:

Options:

  • (A) Terminal velocity in a vertical upward airflow stream
  • (B) Moisture content
  • (C) Color and reflectance
  • (D) Thermal conductivity

Answer Key:

A

Step-by-Step Solution & Explanation

Sound wheat grains have a terminal velocity of $8\text{ to }10\text{ m/s}$, whereas lightweight chaff has $2\text{ to }4\text{ m/s}$; setting air velocity at $5-6\text{ m/s}$ lifts and exhausts the chaff while grain falls.
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