Question Bank • QB_SUB_MD_SAF_004 MSQ • 2 Marks

Section 2: Farm Machinery

Machine Design

Subtopic: Overload safety devices used in farm machinery

Question Statement:

Which of the following overload protective devices are commonly employed in agricultural implement power trains?

Options:

  • (A) Sacrificial shear bolts in PTO yokes
  • (B) Pre-loaded spring slip clutches
  • (C) Overrunning sprag clutches in high-inertia baler flywheels
  • (D) Rigid welded flange couplings

Answer Key:

A, B, C

Step-by-Step Solution & Explanation

Shear bolts protect against catastrophic jamming; slip clutches absorb transient torque peaks; overrunning clutches prevent high rotational inertia of implements (e.g. balers, rotary mowers) from driving the tractor transmission forward during braking. Rigid welded couplings offer no overload protection.
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