Steam Boilers, Engines, Nozzles and Turbines
Fire tube boilers are those in which

Forced circulation takes place
Tubes are laid vertically
Water passes through the tubes and flue gases around it
Flue gases pass through tubes and water around it

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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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