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Energising the transformer primary from a triangular wave flux makes the output voltage as __________

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Energising the transformer primary from a triangular wave flux makes the output voltage as __________

(a) square wave shifted by 90°

(b) a sine wave

(c) a triangular wave

(d) a square wave

I have been asked this question during an online interview.

I'd like to ask this question from Transformer Phasor Diagram in division Transformers of Electrical Machines

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Best answer
The correct choice is (d) a square wave

Best explanation: E = -N*dϕ/dt.

              Differentiation of triangular wave results in square wave.

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