Steam Boilers, Engines, Nozzles and Turbines
A nozzle is said to be a convergent nozzle

When the cross-section of the nozzle increases continuously from entrance to exit
None of these
When the cross-section of the nozzle decreases continuously from entrance to exit
When the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit

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Steam Boilers, Engines, Nozzles and Turbines
In natural circulation type boiler,

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
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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