At a stage of reaction turbine, the mean diameter of rotor is \(1.4 \mathrm{~m}\). the speed ratio is 0.7. Determine the blade inlet angle if the blade outlet angle is \(20^{\circ}\). The rotor speed is \(3000 \mathrm{rpm}\). Also find the diagram efficiency the percentage increase in it and rotor speed if the rotor is designed to run at the best theoretical speed, the exit angle being \(20^{\circ}\).