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In a DC machine, the form of flux density distribution (main field only) waveform is __________

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In a DC machine, the form of flux density distribution (main field only) waveform is __________

(a) Triangular

(b) Sinusoidal

(c) Saw tooth

(d) Trapezoidal

I had been asked this question in homework.

I'm obligated to ask this question of Armature Reaction -1 in section Armature Reaction of DC Machines

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Right option is (d) Trapezoidal

Easiest explanation: Flux density waveform is symmetrical and square wave with distortion at the zero points, causing wave to be in trapezoidal shape. The wave is flat topped, which get distributed due to armature mmf distribution, giving rise to the resultant flux distribution wave.

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