Allied & ICAR Exam Bank • ALLIED_0953 MCQ • 1 Mark

Section 6: Agricultural Process Engineering

Material Handling and Storage

Subtopic: Material Handling Equipment

Question Statement:

In vertical pneumatic conveying of granular agricultural grains, 'choking' refers to the hydraulic instability where:

Options:

  • (A) Superficial air velocity drops below choking velocity ($v_{ch}$), causing particles to collapse from dilute phase into a dense slugging column that plugs the riser
  • (B) Air velocity reaches speed of sound
  • (C) Pipe explodes due to vacuum
  • (D) Grains turn into liquid

Answer Key:

A

Step-by-Step Solution & Explanation

Choking occurs at the boundary between dilute-phase and dense-phase pneumatic transport when upward aerodynamic drag can no longer sustain dispersed suspension, collapsing the stream into dense slugs.
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