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A double cage rotor gives an induction machine

  • A.a torque independent of the slip of the machine
  • B.high starting torque with a low running slip
  • C.high running slip with a low starting torque
  • D.no starting torque at all until it is turning

Answer: B

At standstill the high rotor frequency confines the current to the outer high-resistance cage, and at running slip it spreads into the inner low-resistance one. The machine therefore behaves as if its rotor resistance varied with speed.

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