Steam Boilers, Engines, Nozzles and Turbines
Gusset stays in a boiler are provided to

Support furnace freely from top
Prevent the bulging of flat surfaces
Avoid explosion in furnace
Prevent leakage of hot flue gases

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

When the cross-section of the nozzle decreases continuously from entrance to exit
When the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit
None of these
When the cross-section of the nozzle increases continuously from entrance to exit

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