Discussion
Plugging of dc motor is normally executed by __________.
Answer: C
Plugging is done by reversing the armature polarity.
In plugging (reverse current braking) the supply connections to the armature are reversed while the field is left as it is. The back emf, which keeps its original direction while the motor is still turning, now adds to the supply voltage, so a large reverse current flows and produces a strong braking torque. A resistance is inserted to limit this current, and the supply must be cut at zero speed or the motor will start in reverse.
Connecting a resistance across the armature (with the supply removed) is dynamic or rheostatic braking. Reversing both armature and field leaves the direction of torque unchanged, and reversing the field of a shunt motor is not the standard plugging method.
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