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The element \( R_2(1-s)/s \) in the equivalent circuit represents

  • A.the rotor copper loss at that slip
  • B.the stator copper loss at that load
  • C.the core loss the machine incurs when it is running at its rated flux
  • D.the mechanical power developed at the rotor

Answer: D

Separating the total \( R_2/s \) into \( R_2 \) and this term splits the air gap power into the copper loss and the mechanical output explicitly. At unity slip it vanishes, which is why all the air gap power becomes heat at standstill.

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