Question 561Steam Plants - Assistant Engineer

The correct answer is B) velocity-compounded impulse. This turbine type is classified as a velocity-compounded impulse turbine, where the steam expands through a series of nozzles, creating high-velocity steam jets that impinge on the turbine blades, transferring momentum and causing the turbine to spin. The velocity compounding refers to the steam flowing through multiple stages of stationary nozzles and moving blades to extract energy efficiently. The other options are incorrect because: A) pressure-compounded impulse turbines use pressure drops across the stationary blades rather than velocity; C) pressure-compounded reaction turbines rely more on pressure changes across the rotor blades; and D) pressure-velocity compounded impulse is not a standard turbine classification.