Fluid Mechanics
The length of the tube necessary for the boundary layer to reach the centre of the tube and for fully developed flow to be established is called the __________ length.

Transition
Prandtl mixing
Equivalent
None of these

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Fluid Mechanics
Turbine impeller

Produces only radial current
Produces only tangential current
Is effective over wide range of viscosities
Does not produce tangential current

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