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Substituting the slip at which the peak occurs back into the torque expression shows that the peak value does not depend on

  • A.the number of poles for which the stator is wound
  • B.the rotor resistance
  • C.the voltage applied to the stator winding of the machine
  • D.the standstill reactance of the rotor circuit of the machine

Answer: B

Rotor resistance determines where the peak occurs but not how high it is, whereas voltage and reactance both determine its height. That is precisely why added rotor resistance improves starting with no penalty in overload capability.

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