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UPSC Civil Service Exam Questions - Engineering

Q1:

.The displacement thickness of a boundary layer is

A The distance to the point where (v/V) = 0.99

B the distance where the velocity v is equal to the shear velocity V∗ that is where v = V∗

C the distance by which the main flow is to be shifted from the boundary to maintain the continuity equation

D one-half the actual thickness of the boundary layer

ANS:A - The distance to the point where (v/V) = 0.99

The answer should be C.

The distance by which the main flow is to be shifted from the boundary to maintain the continuity equation.