Electrical Machines
If any two leads from slip rings are interchanged in a 3 - Φ induction motor, the motor will

  not run.
  continue running in the same direction as before.
  get damaged.
  run in a direction opposite to previous one.

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

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

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