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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

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

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Hydraulics and Fluid Mechanics in ME
The ratio of absolute viscosity to mass density is known as

coefficient of viscosity
kinematic viscosity
viscosity index
specific viscosity

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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 - V2) / V1
V1 / (V1 - V2)

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

Produce high heads
All of these
Pump viscous fluids
Give high discharge

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Hydraulics and Fluid Mechanics in ME
The unit of surface tension is

N-m
N/m
N/m3
N/m2

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Hydraulics and Fluid Mechanics in ME
An internal mouthpiece is said to be running free if the length of the mouthpiece is __________ the diameter of the orifice.

Less than twice
More than three times
Less than three times
More than twice

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