A triangular mmf wave is produced in the air-gap by
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Answer & Explanation
Correct AnswerB. Rotor of a dc machine
Quick Explanation
A concentrated full-pitch coil carrying current produces a rectangular step in conductor ampere-turn distribution whose integrated air-gap mmf has a triangular spatial form under the idealized assumptions used in machine theory. The winding/current arrangement given by option B produces the stated triangular mmf wave.
Formula / Key Relation
Air-gap mmf shape follows spatial distribution of ampere-turns
Detailed Explanation
Correct Answer
B — Rotor of a dc machine
Concept and Reasoning
A concentrated full-pitch coil carrying current produces a rectangular step in conductor ampere-turn distribution whose integrated air-gap mmf has a triangular spatial form under the idealized assumptions used in machine theory. The winding/current arrangement given by option B produces the stated triangular mmf wave.
Calculation / Key Relation
Air-gap mmf shape follows spatial distribution of ampere-turns
Exam Takeaway
Concentrated winding is associated with a strongly non-sinusoidal/triangular idealized mmf wave.
Common Mistake
Do not assume every AC winding directly produces a sinusoidal space mmf; distribution and winding arrangement matter.
Quick Trick
Concentrated winding is associated with a strongly non-sinusoidal/triangular idealized mmf wave.
Common Mistake
Do not assume every AC winding directly produces a sinusoidal space mmf; distribution and winding arrangement matter.
Exam Tip
Concentrated winding is associated with a strongly non-sinusoidal/triangular idealized mmf wave.
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