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What is the optimum number of steps for small and large transformers?

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What is the optimum number of steps for small and large transformers?

(a) 5, 10

(b) 10, 15

(c) 6, 15

(d) 1, 10

I have been asked this question during an internship interview.

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

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The correct option is (c) 6, 15

For explanation: The optimum number of steps used for the large transformers is maximum of 15. The optimum number of steps for the small transformers is maximum of 6.

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