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

To provide an adequate supply of air for the fuel combustion
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

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Steam Boilers, Engines, Nozzles and Turbines
The effect of friction on the flow of steam through a nozzle is to

Increase the exit temperature without any effect on mass flow rate
Decrease the mass flow rate and to increase the wetness of steam
Decrease the mass flow rate and to decrease the wetness of steam
Increase the mass flow rate and to increase the exit temperature

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