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

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
Feed pump is employed to supplement natural circulation in water wall type furnace
Water is converted into steam in one pass without any recirculation
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

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Steam Boilers, Engines, Nozzles and Turbines
The function of a piston in a steam engine is

To transfer motion from the piston to the cross-head
To convert heat energy of the steam into mechanical work id) to exhaust steam from the cylinder at proper moment
None of these
To guide motion of the piston rod and to prevent it from bending

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