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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
A submerged body is said to be in a stable equilibrium, if its centre of gravity __________ the centre of buoyancy.

Lies above
None of these
Coincides with
Lies below

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Hydraulics and Fluid Mechanics in ME
The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a rectangular notch is given by

dQ/Q = (3/4) × (dH/H)
dQ/Q = (1/2) × (dH/H)
dQ/Q = (3/2) × (dH/H)
dQ/Q = (dH/H)

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Hydraulics and Fluid Mechanics in ME
Newton’s law of viscosity relates

intensity of pressure and rate of angular deformation
shear stress and rate of angular deformation
shear stress, viscosity and temperature
viscosity and rate of angular deformation

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Hydraulics and Fluid Mechanics in ME
When a body is immersed wholly or partially in a liquid, it is lifted up by a force equal to the weight of liquid displaced by the body. This statement is called

Bernoulli’s theorem
Principle of flotation
Pascal’s law
Archimedes’s principle

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Hydraulics and Fluid Mechanics in ME
The force exerted by a jet of water impinging normally on a plate which due to the impact of jet, moves in the direction of jet with a velocity v is

[wa (V - v²)]/g
[wa (V - v)²]/2g
[wa (V - v)]/g
[wa (V - v)]/2g

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Hydraulics and Fluid Mechanics in ME
A piece of metal of specific gravity 7 floats in mercury of specific gravity 13.6. What fraction of its volume is under mercury ?

0.5
0.5
0.515
0.4

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