Civil Engineering MCQJE Level Civil Engineering
In a circular pipe flowing partially full, maximum velocity (higher than full-bore velocity) occurs at a depth of approximately:
Fluid MechanicsOpen Channel FlowHARD
Choose the correct answer
A
0.50 D
B
0.81 D
C
0.94 D
D
1.0 D (full bore)
Correct Answer
B. 0.81 D
Why is this the answer?
Due to the shape of a circular section, wetted perimeter increases faster than area near full bore, reducing hydraulic radius. Maximum velocity occurs at y ≈ 0.81D and maximum discharge at y ≈ 0.94D, both exceeding full-bore values.
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