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The polarity of back e.m.f changes in which of the method?

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in Electric Drives by (99.8k points)
The polarity of back e.m.f changes in which of the method?

(a) Plugging

(b) Regenerative braking

(c) Dynamic braking

(d) Rheostatic braking

I got this question in unit test.

I would like to ask this question from Electric Motors topic in chapter Braking of Electric Motors of Electric Drives

1 Answer

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Right answer is (a) Plugging

The best I can explain: In case of Plugging braking technique polarity of the back e.m.f voltage changes due to which current direction changes and mechanical, electrical energy are wasted in the form of heat in resistors.

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