Steam Boilers, Engines, Nozzles and Turbines
The function of a piston rod is

To transfer motion from the piston to the cross head
To convert heat energy of the steam into mechanical work
To guide motion of the piston rod and to prevent it from bending
To exhaust steam from the cylinder at proper moment

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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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