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

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

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Steam Boilers, Engines, Nozzles and Turbines
The indicated thermal efficiency is defined as the

Ratio of heat equivalent to indicated power to the energy supplied in steam
Ratio of brake power to the indicated power
Product of thermal efficiency and Rankine efficiency
Ratio of thermal efficiency to the Rankine efficiency

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