Hydraulics and Fluid Mechanics in ME
Runaway speed of a hydraulic turbine is

The speed if the turbine runner is allowed to revolve freely without load and with the wicket gates wide open
The speed corresponding to maximum overload permissible
Full load speed
The speed at which turbine runner will be damaged

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Hydraulics and Fluid Mechanics in ME
When an ideal fluid flows past a sphere

total drag is zero
highest intensity of pressure occurs around the circumference at right angles to flow
lowest pressure intensity occurs at front stagnation point
lowest pressure intensity occurs at rear stagnation point

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