Question

Which one of the following statements is not correct?

• A. Cavitation forms where the local pressure drops up to the vapour pressure conditions due to increase in local velocity.
• B. Cavitation takes place in turbine blades, runners of pumps, spillways where local velocity increases considerably.
• C. Cavitation may be prevented by maintaining the ambient pressure relatively higher at probable points of occurrence by raising their levels.
• D. Boundaries likely to be affected by cavitation can be protected against pitting by covering it with tough materials like stainless steel or rubber.

Answer 1

The correct option is C Cavitation may be prevented by maintaining the ambient pressure relatively higher at probable points of occurrence by raising their levels.

Increase in local velocity decreases the pressure and therefore cavitation may occur.
Raising the levels of the point will cause higher gradient and flow velocities will increase. This may cause cavitation.