GATE Papers >> EEE >> 2009 >> Question No 51

Question No. 51 EEE | GATE 2009

The star-delta transformer shown above is excited on the star side with a balanced, 4-wire, 3-phase, sinusoidal voltage supply of rated magnitude. The transformer is under no load condition.

With both S1 and S2 open, the core flux waveform will be

Answer : (B) Flat topped with third harmonic

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