Multiple choice

In the theory of plastic bending of beams, the ratio of plastic moment to yield moment is called

  1. shape factor

  2. plastic section modulus

  3. modulus of resilience

  4. rigidity modulus

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A Correct answer
Explanation

 $\text{Ratio of plastic moment to yield moment} \\ \frac{Z_p \sigma_y}{Z \sigma_y} = \frac{Z_P}{Z} = \text{shape factor}$