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Select the correct statement for a 50% reaction stage in a steam turbine.

1. The rotor blade is symmetric.
2. The stator blade is symmetric.
3. The absolute inlet flow angle is equal to the absolute exit flow angle.
4. The absolute exit flow angle is equal to the inlet angle of the rotor blade.

Correct answer: The absolute exit flow angle is equal to the inlet angle of the rotor blade.

Solution

In a 50% reaction stage, the pressure drop is equally divided between stator and rotor, which leads to a symmetric velocity-triangle relation. A key result is that the absolute exit angle from the stator matches the rotor inlet blade angle.

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