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A cage induction motor differs from a wound rotor machine in that its rotor

  • A.carries a field winding fed from a separate direct supply
  • B.is made of permanent magnet material rather than laminated steel
  • C.rotates at the synchronous speed of the field at all loads
  • D.has no external connections

Answer: D

Short-circuited bars in slots need no brushes or slip rings, which makes the machine simple and reliable but leaves no way to reach the rotor circuit. Rotor resistance control and slip recovery both require the wound alternative.

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