Electrical Machines
The rotor speed of an induction motor is given by

  Nr = 120f / p × (1-s).
None of these
  Ns = 120f /p × ( 1 - r).
  Ns = 120f / p × ( 1 - s ).

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Electrical Machines
An ideal synchronous motor has no starting torque because

 rotor winding is highly reactive.
 relative velocity between the stator and rotor mmf’s is zero.
  relative velocity between stator and rotor mmf’s is not zero.
 rotor is made up of salient poles.

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