Steam Boilers, Engines, Nozzles and Turbines
The proximate analysis of fuel lists

Fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash
Various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as percents by weight
Fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash
Various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as percents by volume

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

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

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