GATE Aerospace Engineering Practice Quiz

Question 1

For a thin symmetric airfoil in incompressible inviscid flow at a small angle of attack $\alpha$ radians, according to thin airfoil theory, the lift coefficient is

Accepted Answer

$C_L = 2\pi \alpha$

Question 2

A calorically perfect gas has $\gamma=1.4$ and gas constant $R=287\,\mathrm{J\,kg^{-1}K^{-1}}$. The speed of sound at $T=300\,\mathrm{K}$ is closest to

Accepted Answer

$347\,\mathrm{m/s}$

Question 3

For a slender circular shaft subjected to a torque $T$, the maximum shear stress is proportional to

Accepted Answer

$\frac{TR}{J}$

Question 4

An aircraft in steady, level, unaccelerated flight has weight $W$, wing area $S$, air density $\rho$, and speed $V$. If the lift coefficient is $C_L$, which relation is correct?

Accepted Answer

$W=\frac{1}{2}\rho V^2 S C_L$

Question 5

An ideal turbojet flies at speed $V_0$ and exhausts the jet at speed $V_j$. Neglecting pressure thrust and fuel mass addition, the propulsive efficiency is

Accepted Answer

$\eta_p=\frac{2V_0}{V_j+V_0}$

Practice Quizzes

GATE Aerospace Engineering Practice Quiz