Circumferential and longitudinal strains in the cylindrical boiler under internal steam pressure are $\epsilon_1$ and $\epsilon_2$ respectively. Change in the volume of the boiler cylinder per unit volume will be
- A. $\epsilon_1^2 \epsilon_2$
- B. $\epsilon_1 \epsilon_2^2$
- C. $2\epsilon_1 + \epsilon_2$
- D. $\epsilon_1 + 2\epsilon_2$
Answer: C. $2\epsilon_1 + \epsilon_2$
Explanation: Volumetric strain $\epsilon_v = \epsilon_l + 2\epsilon_c = \epsilon_2 + 2\epsilon_1$.