Steam Boilers, Engines, Nozzles and Turbines
In water tube boilers

Forced circulation takes place
None of these
Water passes through the tubes which are surrounded by flames and hot gases
The flames and hot gases pass through the tubes which are surrounded by water

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

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

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