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What is the formula to calculate the voltage per turn of the transformer?

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What is the formula to calculate the voltage per turn of the transformer?

(a) voltage per turn = space factor * square root of output power

(b) voltage per turn = space factor / square root of output power

(c) voltage per turn = space factor / square root of output power

(d) voltage per turn = space factor * 2*square root of output power

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Asked question is from Overall Dimensions in portion Design of Transformers of Design of Electrical Machines

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Right choice is (a) voltage per turn = space factor * square root of output power

For explanation: The corresponding space factor is obtained using the formula. Then the output power is obtained and square root of the output power is taken and substituted in the above formula to obtain the voltage per turn.

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