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

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

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Electrical Machines
In a DC machine the armature mmf is

  stationary with respect to armature.
 rotating with respect to field poles.
  stationary with respect to field poles.
  rotating with respect to field poles as well as armature.

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