Allied & ICAR Exam Bank • ALLIED_0114 MCQ • 1 Mark

Section 2: Farm Machinery

Machine Design

Subtopic: Overload safety devices used in farm machinery

Question Statement:

A shear pin is widely used in the PTO drive line of agricultural implements primarily to:

Options:

  • (A) Serve as a sacrificial overload mechanical fuse that shears when torque exceeds a safe threshold
  • (B) Increase rotational speed of the shaft
  • (C) Dampen torsional vibrations permanently
  • (D) Eliminate the need for lubrication

Answer Key:

A

Step-by-Step Solution & Explanation

A shear pin fails in direct shear under abnormal torque overloads (e.g., rotary tiller jamming on a stone), protecting costly transmission gears.
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