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Mechanical Engineering QUESTION #2461
Question 1
The contact ratio (CR) for external spur gears must satisfy which minimum condition for smooth, continuous meshing?
  • \(CR \geq 2.0\)
  • \(CR \geq 1.2\)✔️
  • \(CR = 1.0\) exactly
  • \(CR \leq 1.0\)
Correct Answer Explanation
The contact ratio CR must exceed 1.0 for continuous motion; in practice the minimum acceptable value is \(CR \geq 1.2\) to allow for manufacturing and deflection tolerances.