Allied & ICAR Exam Bank • ALLIED_2808 MCQ • 1 Mark

Section 2: Farm Machinery

Machine Design

Subtopic: Overload safety devices used in farm machinery

Question Statement:

What happens if an operator replaces a Grade 5 shear bolt with a high-tensile Grade 8.8 or 10.9 bolt?

Options:

  • (A) The implement loses overload protection, risking catastrophic failure of the gearbox or PTO shaft
  • (B) Operating efficiency increases by $25\%$
  • (C) Fuel consumption decreases
  • (D) The implement trips more frequently

Answer Key:

A

Step-by-Step Solution & Explanation

High-grade bolts have much higher shear strength, failing to shear under designed overload conditions and causing gearbox casing or tractor drive destruction.
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