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The Ward-Leonard system controls the speed of a dc motor by

  • A.varying the output of a dc generator that feeds it
  • B.inserting resistance in the armature circuit of the motor in graded steps
  • C.switching the supply to the motor on and off at a high frequency
  • D.changing the number of poles for which the machine is wound

Answer: A

A motor-generator set supplies the drive motor, and controlling the generator field gives smooth reversible voltage over the whole range. It is smooth and four-quadrant but needs three machines, which is why converters have displaced it.

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