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Fluid Mechanics

Fluid Mechanics
Laminar flow is characterised by the nonexistence of

Pressure fluctuation
Deviating velocities
All of these
Eddies

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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).

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

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Fluid Mechanics
Purpose of relief valve in a reciprocating pump is to

Protect the pump against developing excessive pressure
Control the rate of discharge
Facilitate unidirectional flow of liquid
Reduce the discharge pressure

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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
>2
43832

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Fluid Mechanics
In Newton's law range, the drag co-efficient for the motion of spherical particle in a stationary fluid is

0.044
44
0.44
4.4

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Fluid Mechanics
The drag co-efficient for a bacterium moving in water at 1 mm/s, will be of the following order of magnitude (assume size of the bacterium to be 1 micron and kinematic viscosity of water to be 10⁻⁶m²/s).

0.44
24
24000
0.24

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