Hydraulics and Fluid Mechanics in ME
The function of guide vanes in a reaction turbine is to

Allow the required quantity of water to enter the turbine
Allow the water to enter the runner without shock
Allow the water to flow over them, without forming eddies
All of the listed here

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

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

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