Steam Boilers, Engines, Nozzles and Turbines
For maximum discharge through a chimney, the condition is that height of hot gas column producing the draught should be

Four times the height of chimney
Equal to the height of chimney
Two times the height of chimney
One-half the height of chimney

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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 measure pressure of steam inside the steam boiler
None of these
To blow off steam when the pressure of steam inside the boiler exceeds the working pressure

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