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The quickest field estimate of a motor's loading uses

  • A.the size of the cable feeding the motor
  • B.the measured input power against the nameplate rating
  • C.the temperature of the motor's frame
  • D.the noise the motor makes under load

Answer: B

Dividing the measured input by the input the motor would take at full load gives the loading directly, and a clamp-on power meter supplies it in a minute. The current alone is misleading, since it does not fall in proportion to the load.

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