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MEO Class II – MET : 2011/FEB/03 – 2011/AUG/03 – 2018/SEP/07 – 2019/JAN/06 – 2021/APR/09
Question
Q9. A. Explain how the efficiency and regulation of a transformer can be assessed by open circuit and short circuit tests?
B. A 25 kVa signal phase transformer 2200:200V has a primary and secondary resistance of 1Ω and 0.01 Ω respectively. Find the equivalent secondary resistance and full load efficiency at 0.8pf lagging, if the iron losses of the transformer are 80% of the full load copper losses.
Asked in Year/Month/Ques No.