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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
Center of buoyancy is the

center of pressure of displaced volume
e.g. of floating body
does not exist
centroid of the displaced volume of fluid

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Hydraulics and Fluid Mechanics in ME
The discharge through a convergent mouthpiece is __________ the discharge through an internal mouthpiece of the same diameter and head of water.

Three fourth
One-half
Equal to
Double

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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 LH5/2
1.84 LH3/2
1.84 LH

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Hydraulics and Fluid Mechanics in ME
For starting an axial flow pump, its delivery valve should be

Open
Depends on starting condition and flow desired
Closed
Could be either open or closed

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Hydraulics and Fluid Mechanics in ME
For small discharge at high pressure, following pump is preferred

Mixed flow
Reciprocating
Centrifugal
Axial flow

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Hydraulics and Fluid Mechanics in ME
A tank of uniform cross-sectional area (A) containing liquid upto height (H1) has an orifice of cross-sectional area (a) at its bottom. The time required to empty the tank completely will be

(2AH₁²)/(Cd × a√2g)
(2AH₁3/2)/(Cd × a√2g)
(2AH₁)/(Cd × a√2g)
(2A√H₁)/(Cd × a√2g)

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