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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The maximum hydraulic efficiency of an impulse turbine is (where φ = Angle of blade tip at outlet)

(1 - cos φ)/2
(1 + sin φ)/2
(1 - sin φ)/2
(1 + cos φ)/2

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Hydraulics and Fluid Mechanics in ME
A piece weighing 3 kg in air was found to weigh 2.5 kg when submerged in water. Its specific gravity is

6
7
5
1

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Hydraulics and Fluid Mechanics in ME
The jet ratio is defined as the ratio of the

Diameter of Pelton wheel to the diameter of jet
Velocity of Pelton wheel to the velocity of jet
Diameter of jet to the diameter of Pelton wheel
Velocity of jet to the velocity of Pelton wheel

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Hydraulics and Fluid Mechanics in ME
The vapour pressure over the concave surface is

less man the vapour pressure over the plane surface
equal to the vapour pressure over the plane surface
greater than the vapour pressure over the plane surface
zero

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Hydraulics and Fluid Mechanics in ME
The volume of a fluid __________ as the pressure increases.

Remains same
None of these
Decreases
Increases

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Hydraulics and Fluid Mechanics in ME
Coefficient of discharge Cd is equal to (where Cc = Coefficient of contraction, Cv = Coefficient of velocity, and Cr = Coefficient of resistance)

Cc/Cr
Cv × Cr
Cc × Cv
Cc × Cr

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