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The DC machines are designed with flat topped flux density waves because _______________

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The DC machines are designed with flat topped flux density waves because _______________

(a) average value of brush voltage is more for a flat topped B-wave

(b) average value of brush voltage is less for a flat topped B-wave

(c) losses for flat topped B-wave are less

(d) none of the mentioned

I got this question in exam.

Origin of the question is Generated EMF in section Principles of Electro mechanical Energy Conversions of Electrical Machines

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Right option is (a) average value of brush voltage is more for a flat topped B-wave

Explanation: For the same value of peak flux density Bp, it is easy to see that average value of brush voltage could be more for a flat topped B-wave than for a sinusoidal flux density wave.

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