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Q#1 Transformers GATE EE 2018 NAT +2 marks -0 marks

A 3-phase 900kVA, , 50Hz transformer has primary (high voltage side) resistance per phase of and secondary (low voltage side) resistance per phase of . Iron loss of the transformer is 10kW. The full load % efficiency of the transformer operated at unity power factor is ______ (up to 2 decimal places).

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