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A hollow shaft of same cross-section area and same mass as a solid shaft, transmits
  • a)
    Same torque
  • b)
    More torque
  • c)
    Less torque
  • d)
    None of the above
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
A hollow shaft of same cross-section area and same mass as a solid sh...
If area of solid and hollow section are equal
Where
k = d / D
Eg: k=0.60
Th = 1.7 Ts Hollow shaft have 70% more torque.
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Most Upvoted Answer
A hollow shaft of same cross-section area and same mass as a solid sh...
Explanation:
The torque transmitted by a shaft is given by the equation:

T = (π/16) * τ * d^3

where τ is the shear stress, and d is the diameter of the shaft.

Same cross-sectional area and mass:

Since the hollow shaft and the solid shaft have the same cross-sectional area and mass, we can assume that the diameter of the hollow shaft is greater than that of the solid shaft.

Therefore, the shear stress in the hollow shaft will be less than that in the solid shaft. This is because the shear stress is directly proportional to the diameter of the shaft.

Transmitting more torque:

As the torque transmitted by a shaft is directly proportional to the shear stress and the cube of the diameter, a larger diameter shaft will transmit more torque. Therefore, the hollow shaft with a larger diameter will transmit more torque than the solid shaft with a smaller diameter.

Conclusion:

Hence, we can conclude that a hollow shaft of the same cross-sectional area and mass as a solid shaft will transmit more torque.
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