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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
For pipes, turbulent flow occurs when Reynolds number is

more than 4000
less than 4000
less than 2000
between 2000 and 4000

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Hydraulics and Fluid Mechanics in ME
The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a rectangular notch is given by

dQ/Q = (dH/H)
dQ/Q = (3/4) × (dH/H)
dQ/Q = (3/2) × (dH/H)
dQ/Q = (1/2) × (dH/H)

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Hydraulics and Fluid Mechanics in ME
A model of a reservior is drained in 4 mts by opening the sluice gate. The model scale is 1: 225. How long should it take to empty the prototype ?

4 x (225)3/2 minutes
4 x V225 minutes
4 minutes
4 (225)1/3 minutes

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Hydraulics and Fluid Mechanics in ME
When the water level on the downstream side of a weir is above the top surface of a weir, the weir is known as

Broad-crested weir
Submerged weir
Ogee weir
Narrow-crested weir

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Hydraulics and Fluid Mechanics in ME
The flow in which the particles of a fluid attain such velocities that varies from point to point in magnitude and direction as well as from instant to instant, is known as

Turbulent flow
One dimensional flow
Steady flow
Uniform flow

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Hydraulics and Fluid Mechanics in ME
The theoretical velocity of jet at vena contracta is (where H = Head of water at vena contracta)

2gH
√(2gh)
2g × √H
H × √(2g)

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