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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
Double
Four times
Eight times

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Hydraulics and Fluid Mechanics in ME
The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is ap-proximately

30 mm
10 mm
20 mm
5 mm

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Hydraulics and Fluid Mechanics in ME
A nozzle placed at the end of a water pipe line discharges water at a

High pressure
Low pressure
High velocity
Low velocity

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Hydraulics and Fluid Mechanics in ME
A metal with specific gravity of 'a' floating in a fluid of same specific gravity 'a' will

Partly immersed
Sink to bottom
Float over fluid
Be fully immersed with top surface at fluid surface

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Hydraulics and Fluid Mechanics in ME
When a cylindrical vessel of radius (r) containing liquid is revolved about its vertical axis ω rad/s, then depth of parabola which the liquid assumes is

ω.r/2g
ω².r²/4g
ω².r²/2g
ω.r/4g

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Hydraulics and Fluid Mechanics in ME
The hydraulic efficiency of an impulse turbine is maximum when velocity of wheel is _______ of the jet velocity,

One-fourth
Double
Three-fourth
One-half

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