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  1. .The displacement thickness of a boundary layer is

    2. 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

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    Answer : Option A

    Explanation :

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