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The armature MMF wave in a DC machine is ____________

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The armature MMF wave in a DC machine is ____________

(a) sinusoidal and depends on the speed

(b) square and independent of speed

(c) triangular and depends on speed

(d) triangular and independent of speed

I had been asked this question in an internship interview.

This is a very interesting question from MMF Produced by Distributed Windings topic in division Synchronous Machines of Electrical Machines

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Correct choice is (d) triangular and independent of speed

The best I can explain: The armature MMF for a DC machine remains constant in amplitude and does not depend on the armature speed, also the MMF wave produced is seen to be a triangluar MMF wave.

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