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Q8. a) Explain why the iron losses in a transformer are substantially independent of the load current. (6)

b) The equivalent circuit for a 200/400-V step-up transformer has the following parameters referred to the low-voltage side. (10)

Equivalent resistance = 0.15 W; Equivalent reactance = 0.37 W

Core-loss component resistance = 600 W; Magnetising reactance = 300 W

When the transformer is supplying a load at 10 A at a power factor if 0.8 lag, Calculate,

i) the primary current

ii) secondary terminal voltage.