For a Hydroelectric project with reaction turbine, the draft tube at the exit from the turbine is
- Aalways immersed in waterCorrect
- Balways above the water
- Cmay either be above or below the water
- Dabove or below the water depending on the unit speed of the turbine
Solution
Concept
Draft tube exit
Step-by-step solution
1. The draft tube exit must be submerged to avoid air entry and keep the column continuous.
Explanation
The tube exit is always below the tail water level.
Why the other options are wrong
Other options are incorrect.
Shortcut
Draft tube: submerged.
Correct answer: A) always immersed in water