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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
For manometer, a better liquid combination is one having

higher surface tension
high density and viscosity
surface tension is no criterion
lower surface tension

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

more than 4000
between 2000 and 4000
less than 2000
less than 4000

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Hydraulics and Fluid Mechanics in ME
A liquid would wet the solid, if adhesion forces as compared to cohesion forces are

less
equal
less at low temperature and more at high temperature
more

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Hydraulics and Fluid Mechanics in ME
Which of the following has highest coefficient of discharge ?

sharp edged orifice
CipoUetti weir
venturimeter
Borda’s mouthpiece running full

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Hydraulics and Fluid Mechanics in ME
A hydraulic coupling belongs to the category of

Energy generating machines
Energy transfer machines
Power developing machines
Power absorbing machines

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Hydraulics and Fluid Mechanics in ME
The boundary layer thickness at a distance of l m from the leading edge of a flat plate, kept at zero angle of incidence to the flow direction, is O.l cm. The velocity outside the boundary layer is 25 ml sec. The boundary layer thickness at a distance of 4 m is (Assume that boundary layer is entirely laminar)

0.20 cm
0.05 cm
0.10 cm
0.40 cm

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