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The outside diameter of a hollow shaft that is twice its inside diameter the ratio of its torquecarrying capacity to that of a solid shaft of the same material and the same outside diameter is
  • a)
    15/16
  • b)
    3/4
  • c)
    1/2
  • d)
    1/16
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
The outside diameter of a hollow shaft that is twice its inside diamet...
Calculation of Outside and Inside Diameter of Hollow Shaft:

Let the inside diameter of the hollow shaft be 'd' and the outside diameter be '2d'

Ratio of Torque-carrying capacity of the Hollow shaft to the Solid shaft:

The torque-carrying capacity of the shaft is proportional to the fourth power of the shaft diameter.

Hence, the torque-carrying capacity of the hollow shaft can be calculated as follows:

Torque-carrying capacity of the hollow shaft = (π/16) × (D^4 - d^4)

where D is the outside diameter of the hollow shaft and d is the inside diameter of the hollow shaft.

Similarly, the torque-carrying capacity of the solid shaft can be calculated as follows:

Torque-carrying capacity of the solid shaft = (π/16) × D^4

Ratio of torque-carrying capacity = (D^4 - d^4) / D^4

= 1 - (d/D)^4

Given, D = 2d

Hence, (d/D) = 1/2

∴ Ratio of torque-carrying capacity = 1 - (1/2)^4

= 1 - 1/16

= 15/16

Therefore, the ratio of torque-carrying capacity of the hollow shaft to that of the solid shaft is 15/16.
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The outside diameter of a hollow shaft that is twice its inside diameter the ratio of its torquecarrying capacity to that of a solid shaft of the same material and the same outside diameter isa)15/16b)3/4c)1/2d)1/16Correct answer is option 'A'. Can you explain this answer?
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