Fluid Mechanics
The equation given below is called the __________ . f-0.5 = 4.07 loge (NRe√f)-0.6

Von-Karman equation
Fanning equation
None of these
Colebrook formula

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Fluid Mechanics
A stream line is

Drawn normal to the velocity vector at every point
Always the path of particle
A line connecting the mid points of flow cross-section
Fixed in space in steady flow

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