ISRO Mechanical & Aerospace 2008 - Question 72

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Topic: Strength of Materials

Couple M is applied at C on a simply supported beam AB. The maximum shear on AC will be

Figure for question 72, ISRO Mechanical & Aerospace 2008

  • A. Zero
  • B. M
  • C. 2M/3
  • D. M/3

Answer: D. M/3

Explanation: Sum of vertical forces: RA + RB = 0. Taking moments about A: RB * 3 = -M, so RB = -M/3, which means RA = M/3. The shear force is constant across the entire beam and equals M/3.

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