Steam Boilers, Engines, Nozzles and Turbines
Fire tube boilers are those in which

Tubes are laid vertically
Water passes through the tubes and flue gases around it
Flue gases pass through tubes and water around it
Forced circulation takes place

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

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

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