engineering recuitment AAI JE Technical Mock Test 2020-21 Fluid Mechanics Turbulent Flow

If k is the height of roughness projection and δ the thickness of laminar sub layer, for a pipe surface to be hydraulically smooth, condition is:

1
k/δ < 0.25
2
1.0 < k/δ < 1.5
3
0.5 < k/δ < 1.0
4
0.25 < k/δ < 0.5
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