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Plugging a dc motor consists of

  • A.raising the armature voltage above its rated value briefly
  • B.reversing the armature voltage while the machine still runs
  • C.connecting a resistor across the armature of the running machine
  • D.removing the field excitation from the machine while it runs

Answer: B

The applied voltage and the back emf now add across the armature circuit, so a large reverse current flows and a heavy braking torque results. Resistance must be inserted to limit that current to something the machine can survive.

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