Prob 1.) Recompute the sample problem of Lecture 1 on "Advantaged of High Transmission Voltages" using the following system of supply: i.) 3 phase, 3 wire ii.) 3 phase, 4 wire Prob 2.) A 30,000 kW at power factor 08 lagging is being transmitted over a 220 kV, three-phase transmission line. The length of the line is 275 km and the efficiency of transmission is 90%. Calculate the weight of copper required. Also calculate the weight of copper had the power been transmitted over a single-phase transmission line for the same line voltage and losses. Assume that the resistance of 1 km long conductor and 1 sq. cm is 0173 and specific gravity of copper is 89. Prob 3.) A 2-wire DC distributor A to G, with a total length of 1.2km is supplied at 250V. Loads 80, 70, 100, 90 and 60A are tapped from points B, C, D, E and F respectively with distances from reference A are 100, 250, 600, 800 and 1100 meters. If the voltage at point G is limited to 210V, find the resistance per meter of this distributor