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

  • question_answer
    A shaft of 50 mm diameter and 1 m length carries a disc which has mass eccentricity equal to 190 microns. The displacement of the shaft at a speed which is 90% of critical speed in microns is:

    A) 810                              

    B) 900

    C) 800                              

    D) 820

    Correct Answer: A

    Solution :

    \[r=\frac{e{{\beta }^{2}}}{1-{{\beta }^{2}}}=\frac{190\times {{(0.9)}^{2}}}{1-{{(0.9)}^{2}}}=810\,\,microns\]


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