Solution: Determine the efficiency of the transformer at half load, 0.80 pf

Solution: Calculate the percent regulation at a lagging power factor of 0.707

Solution: Find the percentage regulation

Solution: Calculate the percent regulation at a power factor of 0.75 lagging

Solution: What is the impedance in ohms referred to the primary?

Solution: Calculate in primary terms the reactance of the transformer

Solution: Solve for the percentage resistance of the transformer

Solution: Solve for the percentage impedance of the transformer

Solution: Find the primary voltage required to produce 240-V at the secondary terminals

Solution: Find the resistance of the secondary winding