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Rotor resistance control of speed is available only on a

  • A.machine with a permanent magnet rotor and no windings at all
  • B.machine fed from a current source inverter rather than a voltage source one
  • C.wound rotor machine with slip rings
  • D.cage machine

Answer: C

Access to the rotor circuit through brushes and slip rings is what the method requires, and a cage rotor offers none. That mechanical complication is why cage machines with converters have largely displaced the wound rotor machine.

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