Hydraulics and Fluid Mechanics in ME
The cavitation in reaction turbines is avoided, to a great extent by

Providing highly polished blades to the runner
Using stainless steel runner of the turbine
All of these
Installing the turbine below the tail race level

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Hydraulics and Fluid Mechanics in ME
Discharge of a centrifugal pump is

Inversely proportional to (diameter)² of its impeller
Inversely proportional to diameter of its impeller
Directly proportional to (diameter)² of its impeller
Directly proportional to diameter of its impeller

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