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The slip method of estimating loading works because slip is nearly proportional to

  • A.the supply voltage applied to the motor
  • B.the motor's efficiency at that loading
  • C.the motor's power factor at that loading
  • D.the load on the motor

Answer: D

A machine running close to synchronous speed is lightly loaded and one near its full-load speed is fully loaded, so a tachometer reading gives the loading without any electrical measurement. It is sensitive to voltage, which limits its accuracy.

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