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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
In a footstep bearing, if the radius of the shaft is doubled, then the torque required to overcome the viscous resistance will be

Sixteen times
Four times
Eight times
Double

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Hydraulics and Fluid Mechanics in ME
The centre of gravity of the volume of the liquid displaced is called

Metacentre
None of the listed here
Centre of pressure
Centre of buoyancy

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Hydraulics and Fluid Mechanics in ME
According to Bernoulli's equation

Z - p/w - v²/2g = constant
Z - p/w + v²/2g = constant
Z + p/w + v²/2g = constant
Z + p/w - v²/2g = constant

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Hydraulics and Fluid Mechanics in ME
A flow whose streamline is represented by a curve, is called

Four-dimensional flow
One-dimensional flow
Three-dimensional flow
Two-dimensional flow

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Hydraulics and Fluid Mechanics in ME
The motion of air mass in a tornado is a

forced vortex motion
forced vortex at center and free vortex outside
free vortex motion
free vortex at center and forced vortex outside

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Hydraulics and Fluid Mechanics in ME
The most economical section of a trapezoidal channel is one which has hydraulic mean depth equal to

1/2 × breadth
1/2 × depth
1/2 × sloping side
1/4 × (depth + breadth)

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