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When is square and stepped cores used?

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When is square and stepped cores used?

(a) when circular coils are required for low voltage distribution

(b) when rectangular coils are required for low voltage distribution

(c) when circular coils are required for high voltage distribution

(d) when rectangular coils are required for high voltage distribution

I had been asked this question by my school teacher while I was bunking the class.

Asked question is from Design of Core and Winding in chapter Design of Transformers of Design of Electrical Machines

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Correct choice is (c) when circular coils are required for high voltage distribution

Best explanation: Circular coils are required for high voltage distribution and power transformer. When circular coils are required square and stepped cores are used.

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