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Railways NTPC (Technical Ability) Vibration Analysis Question Bank Vibration Analysis

  • question_answer
    In the statement "an eccentric mass rotating a 3000 rpm will create X times more unbalanced force than 50% of the same mass rotating at 300 rpm", 'X' stands for:

    A) 10                                

    B) 50

    C) 100                              

    D) 200

    Correct Answer: D

    Solution :

    Unbalanced force, \[F=me{{\omega }^{2}}\] \[\omega =\frac{2\pi N}{60}\]             \[\therefore \,\,\,\,\,\,\,F\propto m{{N}^{2}}\] \[\frac{{{F}_{1}}}{{{F}_{2}}}=\frac{{{m}_{1}}N_{1}^{2}}{{{m}_{1}}N_{2}^{2}}=\frac{m}{\left( \frac{m}{2} \right)}\times \left( \frac{3000}{300} \right)=2\times 100=200\]


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