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Insulation resistance of a machine winding is measured with

  • A.a direct voltage applied for a stated time
  • B.an alternating voltage at rated frequency
  • C.a direct current of rated magnitude passed through it
  • D.a mechanical load applied to the shaft

Answer: A

A megohmmeter applies perhaps five hundred or a thousand volts and the reading is taken after a stated interval, since the current falls as the dielectric polarises. Temperature has a large effect and the reading is corrected for it.

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