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

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

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Steam Boilers, Engines, Nozzles and Turbines
In fire tube boilers

None of these
Water passes through the tubes which are surrounded by flames and hot gases
Forced circulation takes place
The flames and hot gases pass through the tubes which are surrounded by water

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Steam Boilers, Engines, Nozzles and Turbines
The theoretical indicator diagram of a simple steam engine is based upon the assumption that

There is no pressure drop due to condensation
All of these
The expansion (or compression) of the steam is hyperbolic
Steam is admitted at boiler pressure and exhausted at condenser pressure

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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 = α₂ and β₁ = β₂
α₁ = β₁ and α₂= β₂
α₁ = β₂ and β₁ = α₂

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