A 5 kVA single-phase transformer has a core loss of 35 W and a full load copper loss of 40 W. It operates full load, 80% pf lagging for 6 hours, half load, 75% pf lagging for 12 hours and quarter load at unity pf for 6 hours. Determine its all-day efficiency.

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Single Phase Transformer

A single-phase transformer is a type of power transformer. It is an electrical device that accepts converts the single phase alternating power into single phase alternating power. In this power conversion the voltage is stepped up or down. If the voltage is stepped up, the current will be stepped down and if the voltage is stepped down, the current will be stepped up.