Electrical Machines
Two of supply terminals to a 3 - Φ induction motor get interchanged during re-connection after normal maintenance. When switched on the supply, the motor will

  rotate in the same direction as before maintenance.
  not start at all.
  get heated and damaged.
  rotate in direction opposite to that before maintenance.

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Electrical Machines
An ideal synchronous motor has no starting torque because

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

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