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
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
If the elevation of hydraulic grade line at the junction of three pipes is above the elevation of reservoirs B and C and below reservoir A, then the direction of flow will be

from reservoir A to reservoirs B and C
unpredictable
from reservoir C to reservoirs A and B
from reservoir B to reservoirs C and A

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