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The quantity that ultimately limits the power rating of a motor is its

  • A.temperature rise
  • B.physical size and the weight of the frame in which it is built
  • C.speed of rotation at the rated operating point of the machine
  • D.power factor as measured at the terminals under rated load

Answer: A

Losses inside the machine turn into heat, and the insulation fails once the temperature exceeds what its class permits. Everything else about rating follows from that single constraint, which is why the subject is really applied thermodynamics.

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