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
The nozzle efficiency is the ratio of

Workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam
None of these
Workdone on the blades to the energy supplied to the blades
Energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam

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