Academics – Electro-Technology : 2018/MAR/06
Question
Q6) A 250 kVA single-phase transformer has iron losses of 1.8 kW. The full load copper loss is 2 kW.
Calculate EACH of the following:
(a) Efficiency at full load, 0.8 lagging p.f.; (6)
(b) kVA supplies at maximum efficiency; (4)
(c) maximum efficiency at 0.7 lagging p.f. (6)
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