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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
Any change in load is adjusted by adjusting following parameter on turbine

Absolute velocity
Blade velocity
Flow
Net head

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Hydraulics and Fluid Mechanics in ME
The specific speed of a hydraulic turbine depends upon

Speed and head of water
Speed and power developed
Discharge and power developed
Speed, power developed and head of water

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Hydraulics and Fluid Mechanics in ME
The discharge over a rectangular notch is (where b = Width of notch, and H = Height of liquid, above the sill of the notch)

(2/3) Cd × b × √(2g) × H2
(2/3) Cd × b × √(2g) × H
(2/3) Cd × b × √(2g) × H3/2
(2/3) Cd × b × √(2gH)

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Hydraulics and Fluid Mechanics in ME
The centre of gravity of the volume of the liquid displaced is called

Metacentre
Centre of buoyancy
Centre of pressure
None of the listed here

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Hydraulics and Fluid Mechanics in ME
For small discharge at high pressure, following pump is preferred

Axial flow
Centrifugal
Reciprocating
Mixed flow

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Hydraulics and Fluid Mechanics in ME
The power absorbed (in watts) in overcoming the viscous resistance of a footstep bearing is

μ π³ N² R² /3600 t
μ π³ N² R⁴ /1800 t
μ π³ N² R⁴ /3600 t
μ π³ N² R² /1800 t

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