For a $50\%$ reaction axial turbine stage ($R = 0.50$), the velocity triangles have which characteristic symmetry?

(A) Rotor and stator blade rows have identical symmetric velocity triangles ($C_1 = W_2$ and $C_2 = W_1$)

(B) Static enthalpy drop in the stator is zero

(C) Absolute flow angle at rotor inlet is $90^\circ$

(D) Rotor blades experience zero aerodynamic lift

Answer Key:

A

### Solution: A 50% reaction stage divides enthalpy drop equally between stator and rotor, resulting in symmetric velocity triangles where $C_1 = W_2$ and $C_2 = W_1$. Correct: A.

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