GATE AG 2009 • Q10 MCQ • 1 Mark

Section 3: Farm Power

Tractors and Power Tillers

Subtopic: Tractor clutches and brakes

Question Statement:

The diameter of an undeflected tractor wheel fitted with 13.6 – 28, 12 PR tyre with an aspect ratio of 0.75 is

Options:

  • (A) 0.99 m
  • (B) 1.05 m
  • (C) 1.23 m
  • (D) 1.40 m

Official Answer Key:

C

Step-by-Step Solution & Explanation

Tyre code 13.6–28: section width = 13.6 in, rim diameter = 28 in. Section height = aspect ratio × section width = 0.75 × 13.6 = 10.2 in. Overall (undeflected) tyre diameter = rim diameter + 2 × section height = 28 + 2(10.2) = 48.4 in. Converting: 48.4 in × 0.0254 m/in = 1.229 m ≈ 1.23 m, matching option (C).

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