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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

Four times
Double
Sixteen times
Eight times

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Hydraulics and Fluid Mechanics in ME
The working of which of the following hydraulic units is based on Pascal's law?

Hydraulic coupling
Air lift pump
Jet pump
Hydraulic press

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Hydraulics and Fluid Mechanics in ME
The centrifugal pump preferred for a specific speed between 80 to 160 r.p.m. is

High speed with radial flow at outlet
Slow speed with radial flow at outlet
High speed with mixed flow at outlet
Medium speed with radial flow at outlet

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Hydraulics and Fluid Mechanics in ME
In order that flow takes place between two points in a pipeline, the differential pressure between these points must be more than

surface friction
frictional force
viscosity
All of these

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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)

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

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Hydraulics and Fluid Mechanics in ME
Pressure intensifier increases the pressure in proportion to

Inverse ratio of diameters
Square of ratio of diameters
Square of inverse ratio of diameters
Ratio of diameters

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