Steam Boilers, Engines, Nozzles and Turbines
The missing quantity per stroke is equal to

Cylinder feed indicated mass of steam
Mass of cushion steam + indicated mass of steam
Cylinder feed + indicated mass of steam
Mass of cushion steam + cylinder feed

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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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