Driving force in an impulse–reaction turbine For an impulse–reaction turbine stage, identify the nature of the driving force acting on the moving blades. Choose the correct option.
Mechanical Engineering
Steam Nozzles and Turbines
Difficulty: Easy
Choose an option
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AAn impulsive force only
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BA reaction force only
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CPartly impulsive and partly reaction
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DNone of the above
Answer
Correct Answer: Partly impulsive and partly reaction
Explanation
ConceptIn an impulse–reaction stage, part of the pressure drop occurs in the fixed nozzles (impulse component) and part within the moving blades (reaction component). The resulting torque arises from both the change in jet momentum (impulse) and from pressure forces across the rotor passages (reaction).
Final AnswerPartly impulsive and partly reaction