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A single phase transformer has emf per turn having 2310/220 V, 50Hz transformer as 13 V. The core area is(in square cm)?

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A single phase transformer has emf per turn having 2310/220 V, 50Hz transformer as 13 V. The core area is(in square cm)?

(a) 393

(b) 277.8

(c) 358.92

(d) 450.03

The question was asked in examination.

I'm obligated to ask this question of Equivalent Circuit of Transformer in division Transformers of Electrical Machines

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Correct choice is (a) 393

Easiest explanation: Emf per turn = 1.44*f*flux density * Area*N2

            Area = 220/(18*1.44*50*1.4) = 393 sq.cm.

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