Hypersonic Aerodynamics MCQ

Q1. Hypersonic flow is generally defined as flow with Mach number greater than:

Correct Answer: C

Hypersonic flow occurs when M > 5.

Q2. At hypersonic speeds, which phenomenon significantly affects aerodynamic heating?

Correct Answer: A

Strong shock waves at hypersonic speeds cause intense aerodynamic heating.

Q3. Which type of shock wave is commonly formed in front of a blunt body at hypersonic speeds?

Correct Answer: D

A bow shock forms ahead of blunt bodies in hypersonic flow.

Q4. Hypersonic flow is dominated by:

Correct Answer: C

Compressibility and high temperatures dominate hypersonic aerodynamics.

Q5. Which parameter is critical in designing thermal protection for hypersonic vehicles?

Correct Answer: A

Surface temperature and heat flux are crucial for thermal protection design.

Q6. The shock layer thickness decreases with:

Correct Answer: A

Higher Mach numbers lead to thinner shock layers.

Q7. Which approximation is used for hypersonic small-disturbance theory?

Correct Answer: B

Linearized hypersonic equations simplify analysis for slender bodies.

Q8. At hypersonic speeds, air behaves as:

Correct Answer: C

High temperatures may cause dissociation and chemical reactions in air.

Q9. The aerodynamic center in hypersonic flow shifts:

Correct Answer: A

At hypersonic speeds, the aerodynamic center moves forward.

Q10. Which of the following increases wave drag in hypersonic vehicles?

Correct Answer: A

Blunt bodies generate stronger bow shocks, increasing wave drag.

Q11. The shock-expansion theory is used for:

Correct Answer: C

Shock-expansion theory analyzes supersonic/hypersonic flow over slender bodies.

Q12. Real gas effects in hypersonic aerodynamics become significant due to:

Correct Answer: C

High temperatures cause air dissociation and ionization, affecting aerodynamics.

Q13. The term "stagnation temperature" refers to:

Correct Answer: A

Stagnation temperature is the temperature the flow would reach if brought to rest isentropically.

Q14. Hypersonic vehicles often use which nose shape to reduce heat loads?

Correct Answer: B

Sharp slender noses reduce shock strength and heat load on the vehicle.

Q15. Which non-dimensional number is important for compressible hypersonic flows?

Correct Answer: B

Mach number governs compressibility effects in hypersonic flows.

Q16. Entropy layer in hypersonic flow develops due to:

Correct Answer: A

Strong shock waves and viscous effects create an entropy layer near the surface.

Q17. Aerodynamic heating is proportional to approximately:

Correct Answer: C

Convective heating scales approximately with V⁓ at hypersonic speeds.

Q18. Hypersonic boundary layer may transition to turbulence due to:

Correct Answer: B

Turbulence occurs at high Mach numbers and due to surface irregularities.

Q19. Shock-shock interactions can lead to:

Correct Answer: B

Intersecting shocks can cause high heat flux and pressure on surfaces.

Q20. Hypersonic waverider vehicles are designed to:

Correct Answer: A

Waverider vehicles attach the shock to the vehicle surface for better L/D ratio.

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