Steam Boilers, Engines, Nozzles and Turbines
In order to compare the capacity of boilers, the feed water temperature and working pressure are taken as

50°C and normal atmospheric pressure
50°C and 1.1 bar pressure
100°C and 1.1 bar pressure
100°C and normal atmospheric pressure

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

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

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