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UPSC Civil Service Exam Questions - Engineering

Q1:

A circular pipe of radius R carries a laminar flow of a fluid. The average velocity is indicated as the local velocity at what radical distance, measured from the centre ?

A 0.50 R

B 0.71 R

C 0.67 R

D 0.29 R

ANS:B - 0.71 R

Velocity distribution: it is parabolic variation. Mean velocity (V) occurs at a distance of 0.707R from the centre of the pipe and is equal to half of the maximum velocity which occurs at centre.