Steam Boilers, Engines, Nozzles and Turbines
In natural circulation 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 indicated thermal efficiency is defined as the

Ratio of heat equivalent to indicated power to the energy supplied in steam
Product of thermal efficiency and Rankine efficiency
Ratio of brake power to the indicated power
Ratio of thermal efficiency to the Rankine efficiency

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Steam Boilers, Engines, Nozzles and Turbines
The efficiency of a boiler is defined as

Ratio of the mass of steam produced to the mass of total water supplied in a given time
Ratio of heat actually used in producing steam to the heat liberated in the furnace
None of these
Ratio of the heat liberated in the furnace to the heat actually used in producing steam

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