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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
Metacentric height is the distance between the metacentre and

center of gravity
water surface
center of buoyancy
center of pressure

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Hydraulics and Fluid Mechanics in ME
The depth of the center of pressure on a vertical rectangular gate 8 m wide and 6 m high, when the water surface coincides with the top of the gate, is

4.0 m
2.5 m
3.0 m
2.4 m

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Hydraulics and Fluid Mechanics in ME
A hemispherical tank of radius (R) has an orifice of cross-sectional area (a) at its bottom and is full of liquid. The time required to empty the tank completely is

14π R1/2/15Cd × a √(2g)
14π R5/2/15Cd × a √(2g)
14π R3/2/15Cd × a √(2g)
14π R7/2/15Cd × a √(2g)

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Hydraulics and Fluid Mechanics in ME
Differential manometer is used to measure

Atmospheric pressure
Pressure in pipes, channels etc.
Very low pressure
Difference of pressure between two points

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Hydraulics and Fluid Mechanics in ME
For pipes, laminar flow occurs when Reynolds number is

More than 4000
Less than 2000
Between 2000 and 4000
Less than 4000

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Hydraulics and Fluid Mechanics in ME
In a centrifugal pump casing, the flow of water leaving the impeller, is

Rectilinear flow
Free vortex motion
Forced vortex
Radial flow

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