Allied & ICAR Exam Bank • ALLIED_2787 MCQ • 1 Mark

Section 2: Farm Machinery

Machine Design

Subtopic: Design and selection of machine elements – gears, pulleys, chains and sprockets and belts

Question Statement:

According to the Lewis beam strength formula for spur gear teeth, the tooth is modeled as a:

Options:

  • (A) Cantilever beam loaded at the tip
  • (B) Simply supported beam loaded at midspan
  • (C) Fixed-fixed beam under uniform load
  • (D) Torsion bar under pure shear

Answer Key:

A

Step-by-Step Solution & Explanation

Wilfred Lewis modeled the gear tooth as a parabolic cantilever beam of uniform strength subjected to tangential tooth load at the tooth tip.
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