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

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

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Steam Boilers, Engines, Nozzles and Turbines
The function of a piston in a steam engine is

To transfer motion from the piston to the cross-head
To guide motion of the piston rod and to prevent it from bending
None of these
To convert heat energy of the steam into mechanical work id) to exhaust steam from the cylinder at proper moment

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