Steam Boilers, Engines, Nozzles and Turbines
The function of injector used in small capacity boilers is to

Inject chemical solution in feed pump
Pump water, similar to boiler feed pump
Create vacuum
Add make up water in the system

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

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