Steam enters the nozzle of an impulse turbine stage at 60 barand 500 °C and leaves at 20 bar. Flow is adiabatic and reversible.The nozzle angle is 20°. The moving blade is symmetric, travels atoptimum velocity, and assumed to be frictionless. It is alsoassumed that there is neither expansion nor contraction of thesteam flow through the blade passage. Draw the velocity diagram andcalculate (a) the blade efficiency and (b) the stageefficiency.
