Allied & ICAR Exam Bank • ALLIED_0138 MCQ • 1 Mark

Section 2: Farm Machinery

Farm Machinery

Subtopic: Forces acting on a tillage tool

Question Statement:

The 'critical depth' of a deep tillage subsoiler is the depth below which:

Options:

  • (A) Soil failure mode transitions from brittle crescent upward heave to compressive forward plastic deformation
  • (B) The draft drops to zero
  • (C) Downward suction becomes infinite
  • (D) Soil inversion reaches $100\%$

Answer Key:

A

Step-by-Step Solution & Explanation

At depths exceeding critical depth, soil fails in two-dimensional plastic lateral flow rather than 3D upward brittle rupture.
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