BE/B Eng Bachelor of Engineering Bachelor of Aerospace Engineering 2

Question 1

Which boundary layer transition phenomenon is most critical for hypersonic vehicle design?

Accepted Answer

Shock-boundary layer interaction

Answer

Shock-boundary layer interaction at hypersonic speeds causes extreme local heating and pressure fluctuations that dominate vehicle design constraints.

Question 2

In orbit determination, what is the primary purpose of the state transition matrix?

Accepted Answer

To propagate the covariance matrix forward in time

Answer

The state transition matrix maps how uncertainties in the initial state propagate over time, enabling Kalman filter covariance updates.

Question 3

What does the Knudsen number indicate in gas dynamics?

Accepted Answer

Ratio of mean free path to characteristic length

Answer

The Knudsen number (Kn = λ/L) determines whether continuum fluid mechanics applies or whether rarefied gas dynamics must be used.

Question 4

Which rocket engine cycle achieves the highest theoretical specific impulse among conventional chemical propulsion systems?

Accepted Answer

Staged combustion cycle

Answer

The staged combustion (full-flow) cycle burns all propellant in the main chamber and uses preburner exhaust to drive turbopumps, maximizing efficiency.

Question 5

In composite laminate design, what is the purpose of a quasi-isotropic layup?

Accepted Answer

To achieve equal stiffness in all in-plane directions

Answer

A quasi-isotropic layup (e.g., [0/±45/90]s) distributes fiber orientations so the laminate has uniform in-plane stiffness regardless of loading direction.

BE/B Eng Bachelor of Engineering Practice Test

BE/B Eng Bachelor of Engineering Practice Test

BE/B Eng Bachelor of Engineering Bachelor of Aerospace Engineering 2