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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
A balloon lifting in air follows the following principle

law of gravitation
Archimedes principle
principle of buoyancy
All of these

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Hydraulics and Fluid Mechanics in ME
The discharge through a siphon spillway is

Cd × a × √(2gH)
Cd × a × √(2g) × H3/2
Cd × a × √(2g) × H2
Cd × a × √(2g) × H5/2

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Hydraulics and Fluid Mechanics in ME
A body floats in stable equilibrium

When its meatcentric height is zero
Metacentre has nothing to do with position of e.g. for determining stability
When its e.g. is below its center of buoyancy
When the metacentre is above e.g.

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Hydraulics and Fluid Mechanics in ME
Reaction turbines are used for

High head and low discharge
High head
Low head
Low head and high discharge

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Hydraulics and Fluid Mechanics in ME
When the coefficient of discharge (Cd) is 0.623, then the general equation for discharge over a rectangular weir is

1.84(L - 0.1nH)H3/2
1.84(L - 0.1nH)H5/2
1.84(L - nH)H2
1.84(L - nH)H3

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Hydraulics and Fluid Mechanics in ME
A turbine is required to develop 1500 kW at 300 r.p.m. under a head of 150 m. Which of the following turbine should be used?

Francis turbine
Pelton wheel with two or more nozzles
Kaplan turbine
Pelton wheel with one nozzle

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