Hydraulics and Fluid Mechanics in ME
Braking jet in an impulse turbine is used

To bring the runner to rest in a short time
To break the jet of water
To change the direction of runner
None of these

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Hydraulics and Fluid Mechanics in ME
For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal

all the four ratios of inertial force to force due to viscosity, gravitation, surface tension, and elasticity
ratio of inertial force to force due to gravitation
ratio of inertial force to force due to surface tension
ratio of inertial force to force due to viscosity

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