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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
Liquids transmit pressure equally in all the directions. This is according to

Pascal's law
Boyle's law
Newton's formula
Archimedes principle

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Hydraulics and Fluid Mechanics in ME
The length AB of a pipe ABC in which the liquid is flowing has diameter (d1) and is suddenly contracted to diameter (d2) at B which is constant for the length BC. The loss of head due to sudden contraction, assuming coefficient of contraction as 0.62, is

0.375 v₂²/2g
v₁²/2g
v₂²/2g
0.5 v₁²/2g

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Hydraulics and Fluid Mechanics in ME
The flow ratio in case of Francis turbine varies from

1 to 1.5
0.6 to 0.9
0.4 to 0.5
0.15 to 0.3

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Hydraulics and Fluid Mechanics in ME
The power absorbed (in watts) in overcoming the viscous resistance of a footstep bearing is

μ π³ N² R⁴ /3600 t
μ π³ N² R² /1800 t
μ π³ N² R² /3600 t
μ π³ N² R⁴ /1800 t

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Hydraulics and Fluid Mechanics in ME
For a body floating in a liquid the normal pressure exerted by the liquid acts at

all points on the surface of the body
metacentre
bottom surface of the body
e.g. of the body

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Hydraulics and Fluid Mechanics in ME
According to Manning's formula, the discharge through an open channel is (where M = Manning's constant)

A × M × m2/3 × i1/2
A1/2 × M2/3 × m × i
A × M × m1/2 × i2/3
A2/3 × M1/3 × m × i

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