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.

Non-Newtonion
Newtonion
Ideal
Incompressible

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Fluid Mechanics
The Prandtl mixing length is

Independent of radial distance from the pipe axis
Zero at the pipe wall and is a universal constant
Independent of the shear stress
Useful for computing laminar flow problems

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Fluid Mechanics
In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of

Friction co-efficient for flows at equal Reynold number
Relative roughness
All of these
Absolute roughness

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