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What is the formula for the cross sectional area of the secondary conductor of the transformer?

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What is the formula for the cross sectional area of the secondary conductor of the transformer?

(a) cross sectional area = secondary current * current density

(b) cross sectional area = secondary current + current density

(c) cross sectional area = secondary current / current density

(d) cross sectional area = secondary current – current density

The question was posed to me during an online exam.

Question is taken from Overall Dimensions topic in section Design of Transformers of Design of Electrical Machines

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Right choice is (c) cross sectional area = secondary current / current density

For explanation: The current flowing through the secondary winding of the transformer is calculated. Next the current density is calculated and the ratio gives the cross sectional area of the secondary conductor.

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