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

  • question_answer A tapering bar (diameters of end sections being \[{{d}_{1}}\] and\[{{d}_{2}}\]) and a bar of uniform cross-section 'd' have the same length and are subjected to the same axial pull. Both the bars will have the same extension if  'd' is equal to

    A) \[\frac{{{d}_{2}}+{{d}_{2}}}{2}\]                  

    B) \[\sqrt{{{d}_{1}}{{d}_{2}}}\]

    C) \[\sqrt{\frac{{{d}_{1}}{{d}_{2}}}{2}}\]                       

    D) \[\sqrt{\frac{{{d}_{2}}+{{d}_{2}}}{2}}\]

    Correct Answer: B


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