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Fluid Mechanics

Fluid Mechanics
For laminar flow of a shear thinning liquid in a pipe, if the volumetric flow rate is doubled, the pressure gradient will increase by a factor of

>2
43832
2

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Fluid Mechanics
Net positive suction head (NPSH) of a centrifugal pump must be

Less than barometric pressure
Equal to the vapour pressure of the liquid
Less than the vapour pressure of the liquid
Greater than the vapour pressure of the liquid

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Fluid Mechanics
A fluid which has a linear relationship between the magnitude of applied shear-stress and the resulting rate of deformation is called a/an __________ fluid.

Ideal
Newtonion
Non-Newtonion
Incompressible

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Fluid Mechanics
In case of turbulent flow of a Newtonion fluid in a straight pipe, the maximum velocity is equal to (where, Vavg = average fluid velocity)

1.8 Vavg
Vavg
1.5 Vavg
1.2 Vavg

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Fluid Mechanics
The peripherial velocity at inlet of a centrifugal pump having inlet diameter of 25 cms and rotating at 950 rpm is __________ m/sec.

12.4
736.4
1.8
186.2

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Fluid Mechanics
For turbulent fluid flow in pipe, the expression for Prandtl one seventh power law is (where, r = pipe radius, x = distance).

None of these
V/Vmax = (x.r)1/7
V/Vmax = (x/r)1/7
V/Vmax = (r/x)1/7

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