Steam Boilers, Engines, Nozzles and Turbines
A packaged boiler is one in which various parts like firing equipment, fans, feed pumps and automatic controls are

Purchased from several parties and packed together at site
Supplied by same manufacturer loose and assembled at site
Packaged boiler does not exist
Supplied mounted on a single base

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

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