Hydraulics and Fluid Mechanics in ME
A tank of uniform cross-sectional area (A) containing liquid upto height (H1) has an orifice of cross-sectional area (a) at its bottom. The time required to bring the liquid level from H1 to H2 will be

2A × √H₂/Cd × a × √(2g)
2A × (√H₁ - √H₂)/Cd × a × √(2g)
2A × √H₁/Cd × a × √(2g)
2A × (√H3/2 - √H3/2)/Cd × a × √(2g)

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Hydraulics and Fluid Mechanics in ME
The overall efficiency of a reaction turbine is the ratio of

Power produced by the turbine to the energy actually supplied by the turbine
Actual work available at the turbine to the energy imparted to the wheel
None of these
Work-done on the wheel to the energy (or head of water) actually supplied to the turbine

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