Steam Boilers, Engines, Nozzles and Turbines
The maximum discharge through a chimney occurs when the height of chimney is

Equal to the height of the hot gas column producing draught
Outside temperature is very low
Around 200 meters
Infinitely long

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

None of these
To measure pressure of steam inside the steam boiler
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

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