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

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

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

To provide reciprocating motion to the slide valve
To convert rotary motion of the crankshaft into to and fro motion of the valve rod
To convert reciprocating motion of the piston into rotary motion of the crank
To provide simple harmonic motion to the D-slide valve

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Steam Boilers, Engines, Nozzles and Turbines
The equivalent evaporation of a boiler is a measure to compare

The two different boilers of the same make
Two different makes of boilers operating under the same operating conditions
The given boiler with the model
Any type of boilers operating under any conditions

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