Maximum efficiency of a reaction turbine The prompt is incomplete and lacks the necessary constraints (e.g., inlet/exit angles, degree of reaction, losses) to state a unique numeric maximum efficiency. Choose the most appropriate statement.
Mechanical Engineering
Steam Nozzles and Turbines
Difficulty: Medium
Choose an option
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Aη<sub>max</sub> = cos²(α) when inlet angle is α and losses are neglected
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Bη<sub>max</sub> occurs at blade speed ratio ρ = cos(α)/2 for a Parsons stage
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C100% (unity), independent of geometry and losses
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DData inadequate — depends on velocity diagrams, reaction, and losses
Answer
Correct Answer: Data inadequate — depends on velocity diagrams, reaction, and losses