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

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

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Steam Boilers, Engines, Nozzles and Turbines
Blow off cock in a boiler is used to

Empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler
Control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required
Put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit
Increase the temperature of saturated steam without raising its pressure

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