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

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 expanded from a high pressure to a condenser pressure in one or more nozzles
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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Steam Boilers, Engines, Nozzles and Turbines
The diagram factor is the ratio of the

Area of the actual indicator diagram to the area of theoretical indicator diagram
Actual mean effective pressure to the theoretical mean effective pressure
Any one of the above
Actual workdone per stroke to the theoretical workdone per stroke

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Steam Boilers, Engines, Nozzles and Turbines
Equivalent evaporation of water is the evaporation for a feed water supply at 100°C

Conversion into steam at the same pressure at which feed water is supplied
Conversion into steam at atmospheric condition
And its corresponding conversion into dry saturated steam at 100°C and 1.033 kg/cm²
And its corresponding conversion into dry steam at desired boiler pressure

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