133) For a Parson's reaction turbine, if ?₁ and ?₂ are fixed blade angles at inlet and exit respectively and ?₁ and ?₂ are the moving blade angles at entrance and exit respectively, then

134) he efficiency of an impulse turbine is maximum when (where V_b = Blade speed, V = Absolute velocity of steam entering the blade, and ? = Nozzle angle)

135) The velocity of whirl at outlet for an axial discharge turbine is

136) In impulse turbines, when friction is neglected, the relative velocity of steam at outlet tip of the blade is __________ the relative velocity of steam at inlet tip of the blade.

137) The friction present between the steam and the nozzle surfaces reduces the heat drop by