Steam Boilers, Engines, Nozzles and Turbines
Boiler stays are used to

Provide support for boiler
Take care of failure in shear
Prevent flat surfaces under pressure from tearing apart
Take care of failure in compression

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

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 decreases continuously from entrance to exit
None of these
When the cross-section of the nozzle increases continuously from entrance to exit

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