Academics – Electro-Technology : 2017/JUL/04
Question
Q4. A 40 kVA 400V/110 V single phase transformer has an iron loss of 0.9 kW. Maximum efficiency occurs at 75 % full load and 0.8 p.f.lag
Calculate EACH of the following:
(a) The copper loss at full load; (6)
(b) The efficiency at full load and 0.8 p.f.lag; (6)
(c) The efficiency at half full load and unity p.f. (4)
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