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

  • question_answer
    An axial flow fan balanced at one speed often exhibits substantial vibrational effect when operated at other speeds, mainly due to:

    A) Primary critical speed effect

    B) Secondary critical speed effect

    C) Unbalanced parts of the fan

    D) Aerodynamic unbalance

    Correct Answer: B

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