Answer Posted / ashish
when a fluid is flowing in a pipe at a point pressure of fluid equal to or fall below to the vapour pressure than boiling start and vapour bubbles formed in the pipe.when bubbles moves in high pressure bubbles collapse and high pressure force genrated and pitting action take place on metallic surface.due to this pitting force cavities are formed on the surface and this phenomina called cavitation.
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Hello Friends I had my ONGC test today,but it was very bad.But I would give certain suggestions so that u may not face he problem which i had. Be thorough with Electrical Technology.Generators.motors stators etc.There are 5 questions on that. There were also good no.of questions from Hydraulic machine and Production technology. Then 3 from Strength of materials.And remember the dimensional quantities.
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