GATE_AE_2027_MOCK_03_Q41
GATE 2027 Aerospace Engineering All-India Master Mock 03 (Flight Dynamics, Controls & Space Trajectories)
MSQ · 2 Marks
Aerodynamics & Fluid Mechanics • Basic Fluid Mechanics • Laminar & Turbulent Boundary Layers
Which of the following statements comparing laminar and turbulent boundary layers on a smooth flat plate are TRUE?
(A) A turbulent boundary layer has a fuller velocity profile near the wall than a laminar boundary layer.
(B) A turbulent boundary layer produces higher skin friction drag than a laminar boundary layer.
(C) A turbulent boundary layer is more resistant to adverse pressure gradient separation than a laminar boundary layer.
(D) A laminar boundary layer grows faster in thickness (\delta) than a turbulent boundary layer.
Answer Key:
A,B,C
Step-by-Step Verified Solution
### Solution: Turbulent boundary layers possess high momentum mixing, giving fuller near-wall velocity profiles (A), higher wall shear stress / skin friction (B), and greater resistance to separation (C). Turbulent layers grow much faster (\delta \propto x^{4/5}) than laminar (\delta \propto x^{1/2}), making D false. Correct: A, B, C.