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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The velocity at which the flow changes from laminar flow to turbulent flow is called

Critical velocity
Sub-sonic velocity
Super-sonic velocity
Velocity of approach

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Hydraulics and Fluid Mechanics in ME
Reynold's number is the ratio of the inertia force to the

Elastic force
Gravity force
Viscous force
Surface tension force

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Hydraulics and Fluid Mechanics in ME
In order to avoid tendency of separation at throat in a Venturimeter, the ratio of the diameter at throat to the diameter of pipe should be

1/4 to 1/3
1/8 to 1/4
1/3 to 1/2
1/16 to 1/8

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Hydraulics and Fluid Mechanics in ME
The center of pressure of a surface subjected to fluid pressure is the point

similar to metacentre
on the surface at which resultant pres-sure acts
on the surface at which gravitational force acis
at which all hydraulic forces meet

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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
Eight times
Sixteen times
Double

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Hydraulics and Fluid Mechanics in ME
The depth of the bucket for a Pelton wheel is generally _________ the diameter of jet.

Equal to
Double
1.8 times
1.2 times

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