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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The unit speed of the turbine runner is

N/√H
N/H
N/H²
N/H3/2

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Hydraulics and Fluid Mechanics in ME
All the terms of energy in Bernoulli’s equation have dimension of

length
energy
work
mass

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Hydraulics and Fluid Mechanics in ME
Euler's equation in the differential form for the motion of liquids is given by

ρ.dp + g.dz + v.dv = 0
dp/ρ - g.dz + v.dv = 0
ρ.dp - g.dz + v.dv = 0
dp/ρ + g.dz + v.dv = 0

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

zero
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

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Hydraulics and Fluid Mechanics in ME
When the Mach number is more than 6, the flow is called

Hyper-sonic flow
Super-sonic flow
Sonic flow
Sub-sonic flow

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Hydraulics and Fluid Mechanics in ME
The property of a fluid which enables it to resist tensile stress is known as

surface tension
compressibility
cohesion
adhesion

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