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Hydraulics and Fluid Mechanics in ME

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

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

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Hydraulics and Fluid Mechanics in ME
The force per unit length is the unit of

Surface tension
Viscosity
Capillarity
Compressibility

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Hydraulics and Fluid Mechanics in ME
Kinematic viscosity is equal to

dynamic viscosity/density
dynamicviscosity x density
density/dynamic viscosity
1/dynamicviscosity x density

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Hydraulics and Fluid Mechanics in ME
An open tank containing liquid is made to move from rest with a uniform acceleration. The angle 0 which the free surface of liquid makes with the horizontal is such that (where a = Horizontal acceleration of the tank, and g = Acceleration due to gravity)

tanθ = a/g
tanθ = a/2g
tanθ = a2/2g
tanθ = 2 a/g

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

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

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Hydraulics and Fluid Mechanics in ME
The centrifugal pump preferred for a specific speed between 80 to 160 r.p.m. is

Slow speed with radial flow at outlet
High speed with mixed flow at outlet
High speed with radial flow at outlet
Medium speed with radial flow at outlet

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