Steam Boilers, Engines, Nozzles and Turbines
In accelerated circulation type boiler

Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum
Feed pump is employed to supplement natural circulation in water wall type furnace
Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam
Water is converted into steam in one pass without any recirculation

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

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