Hydraulics and Fluid Mechanics in ME
The discharge through a channel of trapezoidal section is maximum when

Depth of channel is equal to the width at the bottom
Width of channel at the top is equal to twice the width at the bottom
The sloping side is equal to the width at the bottom
The sloping side is equal to half the width at the top

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

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