In a stage of impulse-reaction turbine, steam enters with a speed of \(250 \mathrm{~m} / \mathrm{s}\) at an angle of \(30^{\circ}\) in the direction of blade motion. The mean blade speed is \(150 \mathrm{~m} / \mathrm{s}\) when the rotor is running as \(3000 \mathrm{rpm}\). The blade height is \(10 \mathrm{~cm}\). The specific volume of steam at nozzle outlet and blade outlet are \(3.5 \mathrm{~m}^{3} / \mathrm{kg}\) and \(4 \mathrm{~m}^{3} / \mathrm{kg}\) respectively. The turbine develops \(250 \mathrm{~kW}\). Assuming the efficiency of nozzle and blades combinedly considered as \(90 \%\) and carry over coefficient as 0.8. Find

(a) the enthalpy drop in each stage,

(b) degree of reaction, and

(c) stage efficiency.