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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The eddy viscosity for turbulent flow is

a function of temperature only
a physical property of the fluid.
independent of the flow
dependent on the flow

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Hydraulics and Fluid Mechanics in ME
Dynamic viscosity of most of the gases with rise in temperature

remains unaffected
unpredictable
increases
decreases

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Hydraulics and Fluid Mechanics in ME
A flow in which the volume of a fluid and its density does not change during the flow is called _________ flow.

Incompressible
Viscous
Compressible
None of these

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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

Four times
Sixteen times
Double
Eight times

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Hydraulics and Fluid Mechanics in ME
According to fan laws, for the fans having constant wheel diameters, the power demand varies

Square of fan speed
Directly as fan speed
Square root of fan speed
Cube of fan speed

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Hydraulics and Fluid Mechanics in ME
The Francis formula for the discharge over Cipoletti weir is

1.84 LH1/2
1.84 LH
1.84 LH3/2
1.84 LH5/2

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