Question 594Steam Plants - Assistant Engineer

The correct answer is A) It creates an axial thrust in the direction of the steam flow. In a reaction turbine, as the steam moves across the moving blades, it imparts momentum to the blades, causing them to rotate. This transfer of momentum from the steam to the blades results in an axial thrust force in the direction of the steam flow, which is the driving force that makes the turbine rotor spin. The other options are incorrect because: B) The steam loses velocity as it passes through the turbine, not at constant pressure. C) The steam gains velocity as it passes through the nozzles, but loses velocity as it crosses the moving blades. D) The axial thrust is in the direction of the steam flow, not opposing it.