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

  • question_answer
    The mass moment of inertia of the two motors in a two rotor system arc \[100\,\,kg.{{m}^{2}}\] and \[10\,\,kg.{{m}^{2}}.\] the length of the shaft of uniform diameter between the rotors is 110 cm. The distance of node from the rotor of lower moment of inertia is:

    A) 80 cm              

    B) 90 cm

    C) 100 cm             

    D) 110 cm

    Correct Answer: C

    Solution :

    \[{{l}_{2}}=\left( \frac{{{J}_{1}}}{{{J}_{1}}+{{J}_{2}}} \right)\,l=\frac{100\times 10}{(100+10)}=100\,\,cm\]


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