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The insulation resistance of a machine is expected to

  • A.fall as the applied test voltage is reduced
  • B.fall as the winding temperature rises
  • C.rise steadily as the winding temperature rises
  • D.stay exactly the same at every temperature

Answer: B

Conduction through the insulation increases with temperature, roughly halving the resistance for every ten kelvin, so readings are corrected to a reference. Comparing an uncorrected hot reading with a cold one is meaningless.

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