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

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

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Hydraulics and Fluid Mechanics in ME
The meatcentric height is the distance between the

Centre of gravity of the floating body and the centre of buoyancy
Original centre of buoyancy and new centre of buoyancy
Metacentre and centre of buoyancy
Centre of gravity of the floating body and the metacentre

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