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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Steam Boilers, Engines, Nozzles and Turbines
The diagram efficiency is the ratio of

Workdone on the blades to the energy supplied to the blades
Energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam
Workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam
None of these

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