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Q5.a) With the aid of delta and star connection diagrams, state the basic equation from which the delta -star and star- delta conversion equation can be derived (6)

b) A 230/115 V, single phase transformer is supplied with a load of 5A at p.f. 0.86 lagging. The no-load current is 0.2 A at p.f. 0.208 lagging. Calculate the primary current and p.f. (10)