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civil engineering upsc civil service exam questions
1. .The displacement thickness of a boundary layer is
(A): one-half the actual thickness of the boundary layer
(B): the distance by which the main flow is to be shifted from the boundary to maintain the continuity equation
(C): The distance to the point where (v/V) = 0.99
(D): the distance where the velocity v is equal to the shear velocity V∗ that is where v = V∗
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