Steam Boilers, Engines, Nozzles and Turbines
In a reaction turbine

The steam is allowed to expand in the nozzle, where it gives a high velocity before it enters the moving blades
The pressure and temperature of steam remains constant
The steam is expanded from a high pressure to a condenser pressure in one or more nozzles
The expansion of steam takes place partly in the fixed blades and partly in the moving blades

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Steam Boilers, Engines, Nozzles and Turbines
The theoretical indicator diagram of a simple steam engine is based upon the assumption that

Steam is admitted at boiler pressure and exhausted at condenser pressure
The expansion (or compression) of the steam is hyperbolic
There is no pressure drop due to condensation
All of these

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