Electrical Machines
DC Motor

  dc series motor.
  dc shunt with armature resistance control.
  dc compound motor.
  dc shunt motor with field weakening.

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

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