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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

Eight times
Double
Four times
Sixteen times

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Hydraulics and Fluid Mechanics in ME
The body will sink down if the force of buoyancy is __________ the weight of the liquid displaced.

More than
Equal to
None of these
Less than

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Hydraulics and Fluid Mechanics in ME
The pressure at a point in a fluid will not be same in all the directions when the fluid is

viscous
viscous and moving.
inviscous and moving
moving

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Hydraulics and Fluid Mechanics in ME
When an internal mouthpiece is running free, the discharge through the mouthpiece is (where a = Area of mouthpiece, and H = Height of liquid above the mouthpiece)

0.707 a. √2gH
0.855 a. √2gH
0.5 a. √2gH
√2gH

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

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Hydraulics and Fluid Mechanics in ME
An ideal flow of any fluid must satisfy

Pascal law
boundary layer theory
continuity equation
Newton’s law of viscosity

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