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

  • question_answer Given that
    d = diameter of spring.
    R = mean radius of coils.
    n = number of coils, and
    G = modulus of rigidity.
    The stiffness of the close-coiled helical spring subject to an axial load W is equal to:    

    A) \[\frac{G{{d}^{4}}}{64{{R}^{3}}n}\]           

    B) \[\frac{G{{d}^{3}}}{64{{R}^{3}}n}\]

    C) \[\frac{G{{d}^{4}}}{32{{R}^{3}}n}\]           

    D) \[\frac{G{{d}^{4}}}{64{{R}^{3}}n}\]         

    Correct Answer: A

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