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

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

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Steam Boilers, Engines, Nozzles and Turbines
The function of a safety valve is

To indicate the water level inside the boiler to an observer
To blow off steam when the pressure of steam inside the boiler exceeds the working pressure
None of these
To measure pressure of steam inside the steam boiler

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