Steam Boilers, Engines, Nozzles and Turbines
When the circulation of water, in a boiler, is by convection currents which are set up during the heating of water, then the boiler is known as

Forced circulation boiler
Internally fired boiler
Externally fired boiler
Natural circulation boiler

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

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

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