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For maximum starting torque in a wound rotor machine, the rotor resistance should equal

  • A.the standstill rotor reactance
  • B.half the standstill rotor reactance of the machine
  • C.twice the standstill rotor reactance of the machine
  • D.zero

Answer: A

Setting the slip at maximum torque to unity requires the two to be equal, which places the peak of the characteristic at standstill. As the machine runs up, resistance is cut out to keep the operating point near the peak.

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