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Hydraulics and Fluid Mechanics in ME

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
1
5
7

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Hydraulics and Fluid Mechanics in ME
Impulse turbine is generally fitted

About 2.5 m above the tail race to avoid cavitations
At the level of tail race
Little above the tail race
Slightly below the tail race

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Hydraulics and Fluid Mechanics in ME
Which of the following statement is correct as regard to water wheels?

They have slow speeds
They are suitable even for low water heads
They give constant efficiency, even if the discharge is not constant
All of these

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Hydraulics and Fluid Mechanics in ME
The magnitude of water hammer depends upon the

Elastic properties of the pipe material
All of these
Elastic properties of the liquid flowing through the pipe
Speed at which the valve is closed

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

More than 4000
Less than 2000
Between 2000 and 4000
Less than 4000

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Hydraulics and Fluid Mechanics in ME
Multistage centrifugal pumps are used to obtain

High head
High head and high discharge
High discharge
Pumping of viscous fluids

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