Steam Boilers, Engines, Nozzles and Turbines
The object of producing draught in a boiler is

To discharge the gases of combustion to the atmosphere through the chimney
To provide an adequate supply of air for the fuel combustion
All of the listed here
To exhaust the gases of combustion from the combustion chamber

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

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

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