Hydraulics and Fluid Mechanics in ME
The runaway speed of a hydraulic turbine is the speed

Corresponding to maximum overload permissible
At full load
At which there will be no damage to the runner
At which the turbine will run freely without load

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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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