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

The pressure and temperature of steam remains constant
The steam is allowed to expand in the nozzle, where it gives a high velocity before it enters the moving blades
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 function of a flywheel is

To keep the engine speed uniform at all load conditions
To convert rotary motion of the crankshaft into to and fro motion of the valve rod
To prevent fluctuation of speed
To convert reciprocating motion of the piston into rotary motion

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