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Hydraulics and Fluid Mechanics in ME

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
Ogee weir
Narrow-crested weir
Submerged weir

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Hydraulics and Fluid Mechanics in ME
The rise or depression of liquid in a tube due to surface tension will increase in size of tube will

Decrease
May increase or decrease depending on the characteristics of liquid
Remain unaffected
Increase

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Hydraulics and Fluid Mechanics in ME
The maximum number of jets generally employed in impulse turbine without jet interference is

8
12
4
6

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Hydraulics and Fluid Mechanics in ME
A glass tube of small diameter (d) is dipped in fluid. The height of rise or fall in the tube given by (where w = Specific weight of liquid, α = Angle of contact of the liquid surface, and σ = Surface tension)

4wd/σ cosα
4σ cosα/wd
wd/4σ cosα
σ cosα/4wd

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Hydraulics and Fluid Mechanics in ME
The loss of head due to friction in a pipe of uniform diameter in which a viscous flow is taking place, is (where RN = Reynold number)

4/RN
64/RN
1/RN
16/RN

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Hydraulics and Fluid Mechanics in ME
The velocity at which the laminar flow stops, is known as

Lower critical velocity
None of these
Velocity of approach
Higher critical velocity

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