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The approximate equivalent circuit of an induction machine moves the magnetising branch to

  • A.the middle of the rotor resistance element
  • B.a position in series with the rotor circuit
  • C.the input terminals
  • D.the rotor side of the leakage reactances

Answer: C

Shifting it across the stator impedance simplifies the algebra considerably at the cost of a small error, which is acceptable for a machine of appreciable rating. The exact circuit is used where the stator impedance is a large fraction of the total.

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