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Last Updated On [03-11-2023]

Which one of the following statements is NOT true
(A) Compared to a laminar boundary layer, a turbulent boundary layer is more desirable on a wing operating at large angle of attack
(B) The skin friction drag for a turbulent boundary layer is larger than that for a laminar boundary layer
(C) The location of transition from laminar to turbulent boundary layer depends only on the operating Reynolds number
(D) A separated flow does not necessarily lead to a turbulent boundary layer


Question ID - 155556 :-

Which one of the following statements is NOT true
(A) Compared to a laminar boundary layer, a turbulent boundary layer is more desirable on a wing operating at large angle of attack
(B) The skin friction drag for a turbulent boundary layer is larger than that for a laminar boundary layer
(C) The location of transition from laminar to turbulent boundary layer depends only on the operating Reynolds number
(D) A separated flow does not necessarily lead to a turbulent boundary layer

1 Answer
5876 Votes
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Answer Key : (C) -

(C) The location of transition from laminar to turbulent boundary layer depends only on the operating Reynolds number



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A De Laval nozzle is to be designed for an exit Mach number of $1.5 .$ The reservoir conditions are given as $\mathrm{P}_{0}=1$ atm (gage). $\mathrm{T}_{0}=20^{\circ} \mathrm{C}, \gamma=1.4$. Assuming shock free flow in the nozzle, the exit absolute pressure (in atm) is____________(in three decimal places)


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