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

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

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Steam Boilers, Engines, Nozzles and Turbines
In forced recirculation type boiler,

Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum
Water is converted into steam in one pass without any recirculation
Feed pump is employed to supplement natural circulation in water wall type furnace
Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam

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