Question 600Steam Plants - Assistant Engineer

The correct answer is A) Velocity-compounded stages followed by reaction blading. An impulse-reaction turbine is characterized by having an initial set of impulse (velocity-compounded) stages, followed by a set of reaction blading stages. The impulse stages use the kinetic energy of the steam to impart velocity to the blades, while the reaction stages utilize both the pressure and velocity of the steam to generate power. This arrangement allows the turbine to take advantage of both impulse and reaction principles to maximize efficiency. The other options are incorrect because they do not accurately describe the typical arrangement of an impulse-reaction turbine. Option B describes a pure impulse turbine, option C describes a pure reaction turbine, and option D describes the reverse of the correct arrangement.