Electrical Machines
Star - delta method of starting of motor is not possible in case of

  low horse power motor.
  high torque motor.
  single phase induction motor.
  high speed motor.

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Electrical Machines
The mmf produced by rotor currents of a 3 - Φ induction motor

  is at standstill with respect to stator mmf.
  rotates at slip speed with respect to stator mmf.
  rotates at synchronous speed with respect to rotor.
  rotates at the speed of rotor in the air gap.

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