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

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Steam Boilers, Engines, Nozzles and Turbines
A nozzle is said to be a divergent nozzle

When the cross-section of the nozzle decreases continuously from entrance to exit
None of these
When the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit
When the cross-section of the nozzle increases continuously from entrance to exit

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