Steam Nozzles and Turbines MCQ with Answers

Steam Nozzles and Turbines MCQ with Answers

131) The expansion of steam, as it flows over the blades in reaction turbine, represents

Answer is:

isentropic process

132) The critical pressure ratio for initially superheated steam is __________ as compared to initially dry saturated steam.

Answer is:

less

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

Answer is:

?₁ = ?₂ and ?₁ = ?₂

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)

Answer is:

V_b = 0.5 V cos ?

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

Answer is:

zero