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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
Reaction turbines are used for

High head
Low head and high discharge
Low head
High head and low discharge

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Hydraulics and Fluid Mechanics in ME
The efficiency of jet propulsion for a ship with inlet orifices at right angles to the direction of motion of ship is given by

[(Vr - v) v]/ Vr
[2(Vr - v) v]/ Vr²
[2(Vr + v) v]/ Vr²
[(Vr + v) v]/ Vr

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

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

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Hydraulics and Fluid Mechanics in ME
In order to increase sensitivity of U-tube manometer, one leg is usually inclined by angle 'θ'. Sensitivity of inclined tube to sensitivity of U-tube is equal to

1/Cosθ
Sinθ
1/Sinθ
Cos θ

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Hydraulics and Fluid Mechanics in ME
The discharge through a small rectangular orifice is given by (where Cd = Coefficient of discharge for the orifice, a = Cross-sectional area of the orifice, h = Height of the liquid above the centre of the orifice)

Q = (Cd × a)/√(2gh)
Q = (2/3). Cd × a × h
Q = (3Cd × a)/√(2h)
Q = Cd × a × 2gh

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Hydraulics and Fluid Mechanics in ME
Casting of a centrifugal pump is designed so as to minimize

Friction loss
Loss of kinetic energy
Static head
Cavitations

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