Allied & ICAR Exam Bank • ALLIED_0668 MCQ • 1 Mark

Section 6: Agricultural Process Engineering

Grain Storage Structures and Silos

Subtopic: Grain Storage Structures and Silos

Question Statement:

In Janssen's equation for a deep grain silo, vertical pressure $P_v$ does NOT increase linearly with depth because:

Options:

  • (A) Frictional shear stress against the silo sidewall supports a substantial portion of the grain weight
  • (B) Grain density approaches zero
  • (C) Gravity decreases with depth
  • (D) Grain turns into a liquid

Answer Key:

A

Step-by-Step Solution & Explanation

Wall friction ($\\tau = \\mu' P_L = \\mu' k P_v$) transfers vertical grain weight to the silo walls, causing pressure to reach an asymptotic maximum at great depths.
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