1. Aerodynamics

Fundamental Principles — Quiz

Test your understanding of fundamental principles with 5 practice questions.

Practice Questions

Question 1

If a gas has a molecular mean free path of 2\ $\mathrm{\mu m}$ and flows over a flat plate with characteristic length 100\ $\mathrm{mm}$, what is the Knudsen number and which flow regime does this indicate?

Question 2

If the boundary layer thickness $\delta$ over a wing is halved while maintaining the same free-stream velocity and fluid properties, how does the wall shear stress $\tau$_w change?

Question 3

For air with density $\rho$=1.225\ $\mathrm{kg/m^3}$ flowing at velocity V=50\ $\mathrm{m/s}$, what is the dynamic pressure q?

Question 4

If the static pressure in a wind tunnel is p=90\ $\mathrm{kPa}$ and the measured dynamic pressure is q=2000\ $\mathrm{Pa}$, what is the total (stagnation) pressure p_0?

Question 5

An incompressible, inviscid flow accelerates from 20\ $\mathrm{m/s}$ to 40\ $\mathrm{m/s}$. Using Bernoulli's principle and $\rho$=1.225\ $\mathrm{kg/m^3}$, what is the change in pressure $\Delta$ p?