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A current sheet with sinusoidal current produces?

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+1 vote
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in Electrical Machines by (135k points)
A current sheet with sinusoidal current produces?

(a) sinusoidal MMF wave lagging it by 90°

(b) sinusoidal MMF wave leading it by 90°

(c) trapezoidal MMF wave leading it by 90°

(d) trapezoidal MMF wave lagging it by 90°

I had been asked this question during a job interview.

The origin of the question is MMF Produced by Distributed Windings in portion Synchronous Machines of Electrical Machines

1 Answer

+1 vote
by (888k points)
The correct choice is (b) sinusoidal MMF wave leading it by 90°

Explanation: A uniform current sheet produces trapezoidal MMF wave and sinusoidal current sheet produces sinusoidal MMF wave leading by 90°.

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