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Energizing the transformer primary from a triangular wave voltage source makes the output voltage as __________

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Energizing the  transformer primary from a triangular wave voltage source makes the output voltage as __________

(a) zero

(b) a sine wave

(c) a triangular wave

(d) a pulsed wave

I had been asked this question during an interview.

The doubt is from Transformer Phasor Diagram topic in portion Transformers of Electrical Machines

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The correct option is (c) a triangular wave

For explanation I would say: Output will follow the shape of input wave. As the primary input is triangular in shape, its secondary will also be same.

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