Steam Boilers, Engines, Nozzles and Turbines
The selection of type and size of a steam boiler depends upon

The power required and working pressure
The fuel and water available
All of these
The geographical position of the power house

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

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

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