Allied & ICAR Exam Bank • ALLIED_0657 MCQ • 1 Mark

Section 6: Agricultural Process Engineering

Material Handling Equipment

Subtopic: Material Handling Equipment

Question Statement:

In pneumatic conveying of granular agricultural grains, 'dilute phase' (lean phase) conveying is characterized by:

Options:

  • (A) High air velocity ($15-30\text{ m/s}$), low solid-to-air mass ratio (
    lt; 15$), and particles suspended individually in the air stream
  • (B) Piston plugs of grain moving at $1\text{ m/s}$
  • (C) Solid slugs filling the entire pipe
  • (D) Conveying under complete vacuum with zero air

Answer Key:

A

Step-by-Step Solution & Explanation

Dilute phase keeps particles aerodynamically suspended in high-speed air streams above saltation velocity, preventing line choke.
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