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Discussion

Correcting a resistance measurement to a reference temperature is necessary because

  • A.copper resistance changes appreciably with temperature
  • B.the measuring instrument's calibration drifts with temperature
  • C.the insulation resistance falls as the winding warms up
  • D.the flux in the machine changes with temperature

Answer: A

About four per cent per ten kelvin means a hot and a cold reading differ by a fifth or more, so comparisons are meaningless without correction. Standards specify seventy-five degrees as the usual reference for copper windings.

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