Steam Boilers, Engines, Nozzles and Turbines
The ratio of the energy required to produce the artificial draught (expressed in meters head or J/kg of flue gas) to the mechanical equivalent of extra heat carried away per kg of flue gases due to natural draught, is known as

Efficiency of the boiler
Efficiency of the fan
Power of the boiler
Efficiency of the chimney

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

None of these
To indicate the water level inside the boiler to an observer
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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