Steam Boilers, Engines, Nozzles and Turbines
Stoichiometric quantity of air is the

Air required to convert CO into CO₂
Air present in atmosphere at NTP conditions
Air required for complete combustion of fuel with no excess air
Air required for optimum combustion so as to have reasonable excess air

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Steam Boilers, Engines, Nozzles and Turbines
The difference between Cornish boiler and Lancashire boiler is that

Former is fire tube type and latter is water tube type boiler
Former contains one fire tube and latter contains two fire tubes
None of the listed here
Former is water tube type and latter is fire tube type

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