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What is the formula for the diameter of the single phase core type transformer?

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What is the formula for the diameter of the single phase core type transformer?

(a) D = diameter of circumscribing circle + Width of window

(b) D = diameter of circumscribing circle – Width of window

(c) D = diameter of circumscribing circle * Width of window

(d) D = diameter of circumscribing circle / Width of window

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

This intriguing question comes from Overall Dimensions in division Design of Transformers of Design of Electrical Machines

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Right choice is (a) D = diameter of circumscribing circle + Width of window

Best explanation: First the diameter of the circumscribing circle is obtained. Next, the width of the window is calculated, and the sum of both the data provides the diameter of the single phase core transformer.

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