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

Axial velocity at inlet is equal to that at the outlet
Relative velocity at the inlet of the moving blade is equal to that at the outlet
Whirl velocity at inlet is equal to that at the outlet
Absolute velocity at the inlet of moving blade is equal to that at the outlet

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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 a pressure drop in the nozzle
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

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