Q6. (a) Sketch an arrangement showing the principal of a proportional plus Integral (P + I) control loop. (6)
(b) Compare the series and parallel resonance circuits. Find the frequency at which the following circuit resonates. (10)
Q4. A) Explain the potential hazards if liquid-cooled transformers are used. (6) b) What are the losses in transformers? Mention the various factors which affect these losses. In a 25 KVA, 3300/233 V, single phase transformer, the iron and full-load Cu. Losses are respectively 350 and 400 w. Calculate the efficiency at half-full load 0.8 power factor. (10)
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