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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The surface tension of mercury at normal temperature is __________ that of water.

None of these
Lower than
Same as
Higher than

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Hydraulics and Fluid Mechanics in ME
For small discharge at high pressure, following pump is preferred

Axial flow
Mixed flow
Centrifugal
Reciprocating

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Hydraulics and Fluid Mechanics in ME
A fluid in equilibrium can't sustain

Bending stress
Shear stress
Compressive stress
Tensile stress

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Hydraulics and Fluid Mechanics in ME
Reaction turbines are used for

High head and low discharge
High head
Low head and high discharge
Low head

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Hydraulics and Fluid Mechanics in ME
Center of buoyancy is the

centroid of the displaced volume of fluid
e.g. of floating body
does not exist
center of pressure of displaced volume

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Hydraulics and Fluid Mechanics in ME
According to Manning's formula, the discharge through an open channel is (where M = Manning's constant)

A2/3 × M1/3 × m × i
A1/2 × M2/3 × m × i
A × M × m1/2 × i2/3
A × M × m2/3 × i1/2

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