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In the equivalent circuit of an induction machine, the rotor resistance appears as

  • A.\( R_2 \) unchanged
  • B.\( sX_2 \)
  • C.\( R_2/s \) referred to the stator
  • D.\( R_2 s \) referred to the stator winding

Answer: C

Dividing by the slip accounts for the rotor being at slip frequency while the circuit is drawn at supply frequency, and the element then represents the copper loss and the mechanical power together. Splitting it separates the two.

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