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For a Parson's reaction turbine, if α1 and α2 are fixed blade angles at inlet and exit respectively and β1 and β2 are the moving blade angles at entrance and exit respectively, then

α1 = α2 and β1 = β2
α1 = β1 and α2 = β2
α1 < β1 and α2 > β2
α1 = β2 and β1 = α2

Correct Answer: α1 = β2 and β1 = α2

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