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

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

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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
To provide an adequate supply of air for the fuel combustion
All of the listed here

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