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The speed of a dc shunt motor as it is loaded

  • A.falls slightly
  • B.rises steadily as the load current increases
  • C.remains exactly constant whatever the load applied
  • D.falls to zero as soon as any load is applied

Answer: A

The armature resistive drop grows with current, leaving less of the applied voltage for the back emf, so the speed droops by a few per cent from no load to full load. Armature reaction weakens the flux slightly, which offsets part of that droop.

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