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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The depth of the bucket for a Pelton wheel is generally _________ the diameter of jet.

1.2 times
Double
1.8 times
Equal to

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Hydraulics and Fluid Mechanics in ME
Two pipes of same length and diameters d and 2d respectively are connected in series. The diameter of an equivalent pipe of same length is

less than d
greater than 2d
between d and 1.5 d
between 1.5 d and 2d

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Hydraulics and Fluid Mechanics in ME
If V1 and V2 are the velocities of water at inlet and outlet of the draft tube respectively, then the efficiency of a draft tube is

V1² / (V1² - V2²)
(V­1² - V2²) / V1²
V1 / (V1 - V2)
(V­1 - V2) / V1

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Hydraulics and Fluid Mechanics in ME
When time of closure tc = L/v0 (where L is length of pipe and v0 is speed of pressure wave), the portion of pipe length subjected to maximum head is

L
L/2
L/3
L/4

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Hydraulics and Fluid Mechanics in ME
The hydraulic gradient line lies over the centre line of the pipe by an amount equal to the

Pressure head - velocity head
Pressure head + velocity head
Pressure head
Velocity head

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Hydraulics and Fluid Mechanics in ME
The imaginary line drawn in the fluid in such a way that the tangent to any point gives the direction of motion at that point, is known as

Steak line
Stream line
Path line
Potential line

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