Electrical Machines
Which of these types of motor is self starting?

  Poly-phase induction motor.
  Poly-phase synchronous machine.
  Single phase induction motor.
  None of these.

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

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

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