ISRO Mechanical & Aerospace 2018 - Question 72

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Topic: Strength of Materials

A concentrated load of F acts on a simply supported beam of span L at a distance of L/3 from left support, the bending moment at this location C is

Figure for question 72, ISRO Mechanical & Aerospace 2018

  • A. 2FL/3
  • B. 4FL/9
  • C. 2FL/9
  • D. 4FL/3

Answer: C. 2FL/9

Explanation: Taking moment about A: R_B * L = F * (L/3), so R_B = F/3 and R_A = 2F/3. The maximum bending moment at C is M_C = R_A * (L/3) = (2F/3) * (L/3) = 2FL/9.

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