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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The unit of surface tension is

N/m2
N/m3
N/m
N-m

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Hydraulics and Fluid Mechanics in ME
Which place in hydraulic turbine is most susceptible for cavitations?

Guide blade
Penstock
Blade inlet
Inlet of draft rube

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Hydraulics and Fluid Mechanics in ME
Practical fluids

possess all the above properties
possess surface tension
are compressible
are viscous

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Hydraulics and Fluid Mechanics in ME
According to equation of continuity,

a1/v1 = a2/v2
a1v1 = a2v2
w1a1 = w2a2
w1v1 = w2v2

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Hydraulics and Fluid Mechanics in ME
In an internal mouthpiece, if the jet after contraction does not touch the sides of the mouthpiece, then the mouthpiece is said to be

Partially running free
Running free
Running full
Partially running full

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Hydraulics and Fluid Mechanics in ME
The specific speed of a centrifugal pump, delivering 750 liters of water per second against a head of 15 meters at 725 r.p.m., is

48.2 r.p.m
82.4 r.p.m.
24.8 r.p.m.
248 r.p.m

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