Steam Boilers, Engines, Nozzles and Turbines
The purpose of governing in steam turbines is to

Completely balance against end thrust
Maintain the speed of the turbine
Reduce the effective heat drop
Reheat the steam and improve its quality

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

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