Steam Boilers, Engines, Nozzles and Turbines
A regenerative steam cycle renders

Increased thermal efficiency
Decreased work output per unit mass of steam
Decreased work output per unit mass of steam as well as increased thermal efficiency
Increased work output per unit mass of steam

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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
None of these
To transfer motion from the piston to the cross-head
To guide motion of the piston rod and to prevent it from bending

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