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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as

metacentre
center of pressure
center of gravity
center of buoyancy

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Hydraulics and Fluid Mechanics in ME
The distance y from pipe boundary, at which the point velocity is equal to average velocity for turbulent flow, is (where R is radius of pipe)

0.223 R
0.423 R
0.707 R
0.577 R

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Hydraulics and Fluid Mechanics in ME
The power transmitted through the pipe is maximum when the head lost due to friction is equal to

Two-third of the total supply head
One-fourth of the total supply head
One-third of the total supply head
One-half of the total supply head

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Hydraulics and Fluid Mechanics in ME
The impeller of a centrifugal pump may have

Vortex casing
Volute casing with guide blades
Any one of these
Volute casing

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Hydraulics and Fluid Mechanics in ME
When a cylindrical vessel, containing some liquid, is rotated about its vertical axis, the liquid surface is depressed down at the axis of its rotation and rises up near the walls of the vessel on all sides. This type of flow is known as

Turbulent flow
Steady flow
Uniform flow
Vortex flow

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Hydraulics and Fluid Mechanics in ME
In a single casing, multistage pump running at constant speed, the capacity rating is to be slightly lowered. It can be done by

Some other alterations in the impeller
Designing new impeller
Trimming the impeller size to the required size by machining
Not possible

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