Steam Boilers, Engines, Nozzles and Turbines
In an impulse turbine

The steam is expanded in nozzles only and there is a pressure drop and heat drop
The steam is expanded in moving blades only
The steam is expanded both in fixed and moving blades continuously
The pressure and temperature of steam remains constant

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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 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

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