Steam Boilers, Engines, Nozzles and Turbines
The main object of a boiler trial is

To prepare heat balance sheet for the boiler
To determine the thermal efficiency of the boiler when working at a definite pressure
All of these
To determine the generating capacity of the boiler

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Steam Boilers, Engines, Nozzles and Turbines
In natural circulation 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 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
Water is converted into steam in one. Pass without any recirculation
Feed pump is employed to supplement natural circulation in water wall type furnace

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