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A deep bar or double cage rotor is used to obtain

  • A.a rotor that can be fed from an external converter
  • B.a machine that runs at exactly synchronous speed
  • C.high starting torque with low running slip
  • D.high running slip together with a low starting torque

Answer: C

At standstill the rotor frequency is high and the current crowds into the outer high-resistance path, while at running slip it spreads into the low-resistance one. The machine therefore behaves as if its resistance varied with speed.

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