For wind turbine operates at free wind speed of 12 m/s at height 10 m where air density is 1.226 kg/m3, factor of surface roughness α=0.14 where height of tower is 100 m and rotor diameter is 80 m. the wind speed through turbine is reduced by 20% and the generator efficiency is 90%. Find (i) Total power available in wind, (ii) Power extracted by the turbine, (iii) Electrical power generated, and (iv) Axial thrust on the turbine