Correct Answer - Option 4 : 2.0
Explanation:
Speed ratio:
It is defined as the ratio of tangential velocity of vane tip to \(\rm{\sqrt{2gH_{net}}}\).
\(\rm{\mathbf{Speed~ ratio=\frac{U}{\sqrt{2gH_{net}}}}}\)
- For Pelton turbines, it is in the range of 0.45 to 0.5.
- For Francis turbines, it is in nearly the range of 0.7
- For Kaplan turbines, it is in the range of 1.4 to 2.
