TGPSC HMWSSB Manager 2015 Paper 2 · Question 74

Question 74 of the TSPSC Manager (Engineering), HMWSSB, 2015: Paper 2 (Civil Engineering) (1 November 2015). Try it first, then open the answer and explanation.

1. Manager 2015 Paper 2 (Civil) · Q74 · Fluid Mechanics & Hydraulics · Fluid Mechanics

   Boundary layer separation takes place when

   1. ∂p/∂x>0
   2. ∂v/∂y≤0
   3. ∂p/∂x>0 & ∂v/∂y≤0
   4. ∂p/∂x<0
   Show answer

   Answer: (3) ∂p/∂x>0 & ∂v/∂y≤0

   Separation needs an adverse pressure gradient (∂p/∂x > 0) that slows the flow near the wall until the velocity gradient at the wall becomes zero or negative; a favourable gradient (∂p/∂x < 0) prevents separation, and an adverse gradient alone does not guarantee it.

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