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GATE 2016 ME (ME1) – Question 22

Machine Design · Shafts and springs · 1 mark · Multiple choice

The spring constant of a helical compression spring DOES NOT depend on

  1. coil diameter
  2. material strength
  3. number of active turns
  4. wire diameter

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Show answer and explanation

Correct answer: (B) material strength

Explanation

For a close-coiled helical compression spring, k=Gd⁴/(8D³n), using shear modulus, wire diameter, coil diameter and active turns. Material strength governs permissible stress, not the elastic stiffness formula. Thus **material strength, B**. Strength and modulus are distinct material properties.