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

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Electrical Machines
Ward-Leonard system for controlling the speed of a DC motor is used where

 The speed in both the direction is required.
 All of above.
 The accuracy in speed control is required.
 Very fine speed control over the whole range from zero to normal speed is required.

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