Steam Boilers, Engines, Nozzles and Turbines
Degree of reaction is defined as the ratio of

Heat drop in moving blades to the heat drop in fixed blades
Heat drop in moving blades to the heat drop in fixed blades plus heat drop in moving blades
Heat drop in fixed blades to the heat drop in moving blades
Heat drop in fixed blades plus heat drop in moving blades to the heat drop in moving blades

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Steam Boilers, Engines, Nozzles and Turbines
In an impulse turbine

The steam is expanded in nozzles only and there is a pressure drop and heat drop
The pressure and temperature of steam remains constant
The steam is expanded both in fixed and moving blades continuously
The steam is expanded in moving blades only

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