Electrical Machines
In Ward-Leonard system, the lower limit of the speed imposed by

 None of above.
 Armature resistance.
 Residual magnetism of the generator.
 Field resistance.

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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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