Engineering Board Exam Reviewer · Fluid Mechanics · medium

In a reaction turbine, the draft tube is used to:

1. Increase water velocity at the turbine inlet
2. Remove air from the water
3. Control the flow rate
4. Recover kinetic energy at exit and allow the turbine to be placed above tailwater

Answer

D. Recover kinetic energy at exit and allow the turbine to be placed above tailwater

Solution

The diverging draft tube converts exit velocity head into pressure, increasing the effective head.

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