A 100 kVA single-phase transformer exhibits maximum efficiency at 80% of full load, and the total loss in the transformer under this condition is 1000 W. The ohmic (copper) losses at full load will be:

In a single-phase transformer, the number of turns per volt is 8. The primary voltage is 110 V and the secondary voltage is 25 V. Determine the number of turns in the primary winding (N1) and secondary winding (N2).

Consider a 20 kVA, 2200/200 V, 50 Hz single-phase transformer. Test results are: OC Test: 220 V, 4.2 A, 150 W (LV side) SC Test: 88 V, 10 A, 366 W (HV side) Determine the voltage regulation at full load with 0.8 lagging power factor.