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Mr. Dubey • 100.64K Points
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Q. We can employ dummy coils in a DC machine to

  • (A) compensate reactance voltage
  • (B) reduce armature reaction
  • (C) provide mechanical balance to the armature
  • (D) improve the waveforms generated inside the commutator
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Explanation by: Mr. Dubey
dummy coils are placed inside so that to provide mechanical support to dc machine and they do not take part in the emf development.

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