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

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Steam Boilers, Engines, Nozzles and Turbines
The object of producing draught in a boiler is

All of the listed here
To exhaust the gases of combustion from the combustion chamber
To discharge the gases of combustion to the atmosphere through the chimney
To provide an adequate supply of air for the fuel combustion

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