Steam Boilers, Engines, Nozzles and Turbines
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 = β₁ and α₂= β₂
α₁ = α₂ and β₁ = β₂
α₁ = β₂ and β₁ = α₂
α₁ < β₁ and α₂ > β₂

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Steam Boilers, Engines, Nozzles and Turbines
The equivalent evaporation of a boiler is a measure to compare

Two different makes of boilers operating under the same operating conditions
Any type of boilers operating under any conditions
The two different boilers of the same make
The given boiler with the model

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