Railways Technical Ability Vibration Analysis Question Bank Vibration Analysis

  • question_answer A copper wire of radius 0.5 mm is insulated with a sheathing of thickness 1 mm having a thermo- conductivity of 05 W/m.K. The outside surface convective heat transfer coefficient is 10 W/m.K. If the thickness of insulation sheathing is raised by 10 mm, then the electrical current carrying capacity of the wire will:

    A) Increase

    B) Decrease

    C) Remain the same

    D) Vary depending upon the electric conductivity of the wire.

    Correct Answer: C

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