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Fluid Mechanics

Fluid Mechanics
The ratio of actual discharge to theoretical discharge through an orifice is equal to

Cv . Cd
Cd/Cv
Cc . Cv
Cc . Cd

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Fluid Mechanics
The equivalent diameter for flow through a rectangular duct of width B and height H is

4HB/(H + B)
HB/(H + B)
HB/2(H + B)
2HB/(H + B)

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Fluid Mechanics
In which type of fluid flow, the velocity of flow of fluid changes from point to point in the fluid at any instant?

Non-uniform
Rotational
Unsteady
Turbulent

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Fluid Mechanics
Power number is the ratio of

Inertial stress to gravitational stress
Gravitational stress to drag stress
Inertial stress to drag stress
Drag stress to inertial stress

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Fluid Mechanics
The hydrodynamic and thermal boundary layers will merge, when

Prandtl number is one
Archimedes number is greater than 10000
Nusselt number tends to infinity
Schmidt number tends to infinity

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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).

0.24
0.44
24
24000

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