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Mechanical Engineering QUESTION #2474
Question 1
The diametral pitch \(P_d\) (English units) and module \(m\) (SI units) are related by:
  • \(m = P_d / 25.4\)
  • \(m \cdot P_d = \pi\)
  • \(m = 25.4 / P_d\)✔️
  • \(m = P_d \cdot 25.4\)
Correct Answer Explanation
The relationship between module and diametral pitch: \(m = 25.4/P_d\) (since 1 inch = 25.4 mm).