Topic: Strength of Materials
A hollow shaft of same cross-section area as solid shaft transmits
- A. Same torque
- B. Less torque
- C. More torque
- D. Unpredictable
Answer: C. More torque
Explanation: A hollow shaft of the same cross-sectional area as a solid shaft has a higher polar moment of inertia because its material is distributed further away from the neutral axis. Since Torque $T$ is proportional to the polar modulus, it can transmit more torque for the same allowable maximum shear stress.