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 thermal efficiency to the Rankine efficiency
Product of thermal efficiency and Rankine efficiency
Ratio of brake power to the indicated power

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Steam Boilers, Engines, Nozzles and Turbines
In a reaction turbine

The steam is expanded from a high pressure to a condenser pressure in one or more nozzles
The pressure and temperature of steam remains constant
The expansion of steam takes place partly in the fixed blades and partly in the moving blades
The steam is allowed to expand in the nozzle, where it gives a high velocity before it enters the moving blades

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