Discussion
Dynamic braking of a dc motor is arranged by
Answer: A
Correct answer: disconnecting the armature and connecting it across a resistor
In dynamic or rheostatic braking the machine is separated from the supply while its field is maintained, so it continues to generate; the armature is connected across a resistor and the kinetic energy is dissipated there as heat. It is simple and needs no cooperation from the supply, but the energy is wasted. Regenerative braking returns it instead, and plugging reverses the supply connections, which is a third method again.
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