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The speed regulation of a dc motor worsens when

  • A.a smoothing inductor is added to the armature circuit
  • B.resistance is added to the armature circuit
  • C.the armature voltage is raised towards the rated value of the machine
  • D.the field of the machine is strengthened towards its rated flux

Answer: B

The speed drop from no load to full load is the resistive drop divided by the flux constant, so extra resistance steepens the characteristic. That is one reason armature resistance control is unsatisfactory even where the waste is tolerable.

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