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

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Steam Boilers, Engines, Nozzles and Turbines
The function of a piston rod is

To exhaust steam from the cylinder at proper moment
To convert heat energy of the steam into mechanical work
To transfer motion from the piston to the cross head
To guide motion of the piston rod and to prevent it from bending

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