Railways Technical Ability Engineering Mechanics and Strength of Materials Question Bank Strength of Materials

  • question_answer A wooden beam of rectangular cross-section 10 cm deep by 5 cm wide carries maximum shear force of 2000 kg. Shear stress at neutral axis of the beam section is:

    A) Zero                             

    B) \[40\,\,kgf\text{/c}{{\text{m}}^{\text{2}}}\]

    C) \[60\,\,kgf\text{/c}{{\text{m}}^{\text{2}}}\]                  

    D) \[80\,\,kgf\text{/c}{{\text{m}}^{\text{2}}}\]

    Correct Answer: C

    Solution :

    \[{{\tau }_{N.A}}=\frac{3}{2}{{\tau }_{mean}}=\frac{3}{2}\times \frac{2000}{10\times 5}\] \[=60\,\text{kgf/c}{{\text{m}}^{\text{2}}}\]

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