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

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

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

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
When the cross-section of the nozzle decreases continuously from entrance to exit

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