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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
Which of the following turbine is preferred for 0 to 25 m head of water?

Kaplan turbine
Francis turbine
Pelton wheel
None of these

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Hydraulics and Fluid Mechanics in ME
Kinematic viscosity is equal to

dynamicviscosity x density
dynamic viscosity/density
1/dynamicviscosity x density
density/dynamic viscosity

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Hydraulics and Fluid Mechanics in ME
A body floating in a liquid is said to be in neutral equilibrium, if its metacentre

Lies between the centre of buoyancy and centre of gravity
Coincides with its centre of gravity
Lies above its centre of gravity
Lies below its centre of gravity

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Hydraulics and Fluid Mechanics in ME
The meatcentric height of a ship is 0.6 m and the radius of gyration is 4 m. The time of rolling of a ship is

10.4 sec
5.2 sec
4.1 sec
14.1 sec

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Hydraulics and Fluid Mechanics in ME
The discharge through a small rectangular orifice is given by (where Cd = Coefficient of discharge for the orifice, a = Cross-sectional area of the orifice, h = Height of the liquid above the centre of the orifice)

Q = Cd × a × 2gh
Q = (Cd × a)/√(2gh)
Q = (3Cd × a)/√(2h)
Q = (2/3). Cd × a × h

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Hydraulics and Fluid Mechanics in ME
Rain drops are spherical because of

surface tension forces
air resistance
viscosity
atmospheric pressure

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