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 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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Steam Boilers, Engines, Nozzles and Turbines
The function of a piston in a steam engine is

To transfer motion from the piston to the cross-head
To guide motion of the piston rod and to prevent it from bending
None of these
To convert heat energy of the steam into mechanical work id) to exhaust steam from the cylinder at proper moment

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