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Armature reaction in an ac machine appears as

  • A.a reactance in the equivalent circuit
  • B.a resistance in the equivalent circuit
  • C.an additional emf source in series with the winding
  • D.no element at all

Answer: A

Because the armature field revolves in step with the main one in a synchronous machine, its effect can be lumped with the leakage reactance into a single synchronous reactance. The dc machine cannot be treated so neatly, its field being fixed in space.

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