A 250 KVA single phase transformer has iron loss of 1.8KW

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Practice Problems

A 250 KVA single phase transformer has iron loss of 1.8KW. The full load copper loss is 2000 Watts. Calculate

i) Efficiency at full load,0.8 lagging p.f.

ii) KVA supplied at maximum efficiency

iii)Maximum efficiency at 0.8 lagging p.f.

Hint

Engineering"Since the the input power at rated load is 250 kwa. If the losses are 1.8Kw and 2000w, then the total loss is 2800w. Then calculate the output power in the load. Then the efficiency would be= Pout / Pin "...

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