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A chopper-fed dc drive controls the armature voltage by

  • A.inserting and removing resistance in the armature circuit in graded steps
  • B.varying the field current of a separate generator that feeds the machine
  • C.switching the supply on and off rapidly
  • D.delaying the firing of thyristors relative to the supply voltage waveform

Answer: C

The mean voltage is the supply voltage times the duty ratio, so the switching frequency can be far above the supply frequency and the ripple correspondingly small. Choppers are used on drives fed from batteries or a dc link.

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