I. A three-phase line, 3 km long, delivers 3000 kW at a power factor 0.8 (lagging) to a load. If the voltage at the supply end is 11 kV, determine the voltage at the load and the efficiency of transmission. The resistance per km of each conductor is 0.4 ohm and the reactance (line to neutral) per km of each conductor is 0.3 2.