Civil Engineering MCQAE Level Civil Engineering
The ratio of average velocity to maximum velocity for steady laminar flow in a circular pipe is
Fluid MechanicsFluid MechanicsMEDIUM
Choose the correct answer
A
1
B
2
C
0.5
D
0.6
Correct Answer
C. 0.5
Why is this the answer?
For steady laminar (Hagen-Poiseuille) flow in a circular pipe, velocity profile is parabolic: v(r) = Vmax*(1 - (r/R)^2). Average velocity Vavg = Vmax/2 (ratio = 0.5). For turbulent flow, the profile is flatter with Vavg/Vmax ~ 0.8–0.9. This ratio is key in energy loss calculations and in relating pitot tube measurements to Vavg. For laminar pipe flow, Vavg = Vmax/2
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This MCQ belongs to WBPSC AE Previous Years Questions Series. Full tests include timed attempts, rank comparison and subject-wise analysis.