Steam Boilers, Engines, Nozzles and Turbines
Which of the following statement indicates the difference between Cornish boiler and Lancashire boiler?

Cornish boiler has two flue tubes whereas Lancashire boiler has one flue tube
Cornish boiler is a water tube boiler whereas Lancashire boiler is a fire tube boiler
Cornish boiler has one flue tube whereas Lancashire boiler has two flue tubes
Cornish boiler is a fire tube boiler whereas Lancashire boiler is a water tube boiler

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

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