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Railways NTPC (Technical Ability) Theory of Machines and Machine Design Question Bank Theory of Machines

  • question_answer
    A wheel is rolling on a straight level track with a uniform velocity 'v'. The instantaneous velocity of a point on the wheel lying at the mid-point of a radius:

    A) Varies between \[3\frac{v}{2}\] and \[-\frac{v}{2}\]

    B) Varies between \[\frac{v}{2}\] and \[-\frac{v}{2}\]

    C) Varies between 3 \[3\frac{v}{2}\] and \[-\frac{v}{2}\]

    D) Does not vary and is equal to v

    Correct Answer: B

    Solution :

    \[v\,\alpha \,r,\,{{v}_{A}}=\pm \,\frac{v}{2}\]


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