Electrical Machines
Torque angle of a synchorous machine operating from a constant voltage bus is usually defined as the space angle between

 Stator mmf wave and resultant flux density.
  Rotor mmf wave and stator mmf wave.
 Rotor mmf wave and resultant flux density wave.
 Stator mmf wave and resultant mmf wave.

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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

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

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