130. A Francis turbine is to be operated at a speed of 600 rpm and with discharge of 4 m3

/s. If r1

\= 0.6 m, β = 110°, and the blade height B is 10 cm, what should be the guide vane angle α1 for

nonseparating flow condition at the runner entrance?

A. 14.4° B. 15.4°

C. 16.4° D. 17.4°