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Replacing a motor rather than rewinding it is favoured when the motor is

  • A.driving a load that varies widely through the shift
  • B.small, old and of a low efficiency class
  • C.large and of a recent premium efficiency class
  • D.operated for only a few hours a year

Answer: B

A small old machine is cheap to replace and the efficiency gain is large, whereas rewinding a large premium machine is far cheaper than buying another and loses little. Running hours decide whether either is worth doing.

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