General Studies · Hydraulic Turbines
For a medium-head Francis turbine, what is the primary purpose of the spiral casing's gradually decreasing cross-sectional area?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1To convert the pressure energy of the water entirely into kinetic energy.
- 2To recover the pressure energy of water after it leaves the runner.
- 3To reduce the effect of cavitation by increasing the pressure at the runner outlet.
- 4To maintain uniform velocity of water approaching the guide vanes for high efficiency.✓
Correct answer
To maintain uniform velocity of water approaching the guide vanes for high efficiency.
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