Steam Boilers, Engines, Nozzles and Turbines
The power of a boiler may be defined as

The amount of water evaporated from and at 100° C into dry and saturated steam
The ratio of heat actually used in producing the steam to the heat liberated in the furnace
The evaporation of 15.653 kg of water per hour from and at 100° C
The amount of water evaporated or steam produced in kg per kg of fuel burnt

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Steam Boilers, Engines, Nozzles and Turbines
In fire tube boilers

The flames and hot gases pass through the tubes which are surrounded by water
None of these
Forced circulation takes place
Water passes through the tubes which are surrounded by flames and hot gases

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