Steam Boilers, Engines, Nozzles and Turbines
In an impulse turbine

The steam is expanded in nozzles only and there is a pressure drop and heat drop
The pressure and temperature of steam remains constant
The steam is expanded in moving blades only
The steam is expanded both in fixed and moving blades continuously

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Steam Boilers, Engines, Nozzles and Turbines
When the inlet pressure of steam is equal to the exit pressure, then

There is no pressure drop and fluid does not flow through the nozzle
Fluid flows through the nozzle
Pressure drops and fluid flows through the nozzle
There is a pressure drop in the nozzle

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