In a Francis turbine, the runner blades are radial at the inlet and the discharge leaves the runner radially at the exit. For this turbine

Q. In a Francis turbine, the runner blades are radial at the inlet and the discharge leaves the runner radially at the exit. For this turbine

A

The relative velocity is radial at the outlet

B

The absolute velocity is radial at the outlet

C

The guide vane angle is 90 degrees

D

The velocity of flow is constant

Solution:

Francis turbine is the bulk flow is in the radial direction.
To be more clear, the flow is tangential and radial at the inlet but is entirely radial with a negligible tangential component at the outlet.
The flow, under the situation, has to make a 90 degree turn after passing through the rotor for its inlet to the draft tube.
Thus the absolute velocity is radial at the outlet.

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