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MEO Class II – MET : 2026/JAN/03
Question

Q3. (a) Draw a circuit diagram illustrating how a single thyristor (‘Silicon controlled rectifier’) may be used to provide a variable voltage D.C. output from a single phase A.C. supply.

(b) Explain how the firing angle of the thyristor is varied.

(c) Sketch waveforms for the output voltage when the firing angle is: (i) 60° (ii) 120°. (16)

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