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

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

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Hydraulics and Fluid Mechanics in ME
In case of flow through parallel pipes,

The head loss for all the pipes is same
The total discharge is equal to the sum of discharges in the various pipes
Both (A) and (B)
The total head loss is the sum of head losses in the various pipes

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