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Estimating loading from the measured current alone understates the true loading because current

  • A.is unaffected by the load on the motor
  • B.rises as the load falls on an induction motor
  • C.does not fall in proportion to the load at light loading
  • D.falls faster than the load at light loading

Answer: C

The magnetising component persists, so a motor at a quarter load may still draw half its rated current, and the current method therefore overstates the loading rather than understating it. The slip method and the power method are both better.

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