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

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

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Steam Boilers, Engines, Nozzles and Turbines
The function of a safety valve is

To indicate the water level inside the boiler to an observer
None of these
To measure pressure of steam inside the steam boiler
To blow off steam when the pressure of steam inside the boiler exceeds the working pressure

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