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Railways NTPC (Technical Ability) Engineering Mechanics and Strength of Materials Question Bank Strength of Materials

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    A shaft was initially subjected to bending moment and then was subjected to torsion. If the magnitude of bending moment is found to be the same as that of the torque, then the ratio of maximum bending stress to shear stress would be:

    A) 0.25                             

    B) 0.50

    C) 2.0                               

    D) 4.0

    Correct Answer: D

    Solution :

    Bending stress, \[\sigma =\frac{32M}{\pi {{d}^{3}}}\] Shear stress, \[\tau =\frac{16T}{\pi {{d}^{3}}}\] For M = T, \[=\frac{\sigma }{\tau }=2\]


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