Athree-phase overhead line 200km long has resistance = 0.16ω/km and conductor diameter of 2cm with spacing 4m, 5m and 6m transposed. find: (a) the abcd constants, (b) the vs, is, pfs, i when the line is delivering full load of 50mw at 132kv and 0.8 lagging pf,(c) efficiency of transmission, and (d) the receiving-end voltage regulation.

Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)