Question 672Steam Plants - Assistant Engineer

The correct answer is B) Converts the steam's thermal energy into kinetic energy by increasing its velocity and directing it against the rotor blades. In an impulse turbine, the nozzle assembly is responsible for converting the thermal energy of the steam into kinetic energy. By passing the steam through a converging-diverging nozzle, the nozzle increases the velocity of the steam, which then impacts the turbine blades and causes them to rotate. This conversion of thermal energy to kinetic energy is the primary function of the nozzle assembly in an impulse turbine. The other answer choices are incorrect because they do not accurately describe the role of the nozzle assembly in an impulse turbine. Option A describes the function of a reaction turbine, not an impulse turbine. Option C describes the function of a boiler, not a turbine. Option D is not a correct description of the nozzle assembly's function.