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The slotting produces harmonic fields which cause high frequency losses near the gap surface.

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The slotting produces harmonic fields which cause high frequency losses near the gap surface.

(a) true

(b) false

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Question is taken from Pulsation Losses & Types of Leakages topic in section Principles of Magnetic Circuit Design of Design of Electrical Machines

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Right option is (a) true

Explanation: The pulsation losses are aggravated if the length of air gap is small than the slot openings. The slotting produces harmonic fields which cause high frequency losses near the gap surface.

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