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Rewinding a burnt-out motor typically

  • A.costs a point or two of efficiency each time
  • B.restores the motor to its original efficiency exactly
  • C.improves the motor's efficiency above the original
  • D.leaves the efficiency unchanged but reduces the power factor

Answer: A

Core damage during stripping, a changed slot fill and a different winding technique each take their toll, and two or three rewinds leave a machine several points down. Comparing the cost of a rewind with a new efficient motor is a routine audit recommendation.

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