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For a Parson's reaction turbine, if `alpha_1` and `alpha_2` are fixed blade angles at inlet and exit respectively and `beta_1` and `beta_2`are the moving blade angles at entrance and exit respectively, then


Options:
A .  `alpha_1 = alpha_2 and beta_1 = beta_2`
B .  `alpha_1 = beta_1 and alpha_2 = beta_2`
C .  `alpha_1 < beta_1 and alpha_2 > beta_2`
D .  `alpha_1 = beta_2 and beta_1 = alpha_2`
Answer: Option B


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