MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Aerodynamics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
How is local velocity of sound related to the Riemann invariants? |
| A. | a = \(\frac {γ – 1}{4}\)(J+ + J–) |
| B. | u = \(\frac {γ – 1}{4}\)(J+ J–) |
| C. | a = \(\frac {γ – 1}{4}\)(J+ – J–) |
| D. | a = γ – 1(J+ – J–) |
| Answer» D. a = γ – 1(J+ – J–) | |
| 2. |
If the Riemann variants are known, how can we compute the mass – motion velocity u? |
| A. | \(\frac {J_++J_-}{2}\) |
| B. | \(\frac {J_+-J_-}{2}\) |
| C. | \(\frac {J_+×J_-}{3}\) |
| D. | \(\frac {J_+×J_-}{6}\) |
| Answer» B. \(\frac {J_+-J_-}{2}\) | |
| 3. |
What is the Riemann invariant for C+ characteristic line? |
| A. | J+ = u + ∫\(\frac {dp}{ρa}\) = constant |
| B. | J+ = u – ∫\(\frac {dp}{ρa}\) = constant |
| C. | J+ = u + \(\frac {dp}{ρa}\) |
| D. | J+ = u – \(\frac {dp}{ρa}\) |
| Answer» B. J+ = u – ∫\(\frac {dp}{ρa}\) = constant | |
| 4. |
Riemann invariants are obtained by differentiating the compatibility equations for the characteristic lines. |
| A. | True |
| B. | False |
| Answer» C. | |
| 5. |
What is the slope for C– characteristic line? |
| A. | u + a |
| B. | u – a |
| C. | ua |
| D. | \(\frac {u}{a}\) |
| Answer» C. ua | |
| 6. |
Which of these is the compatibility equation along C+ characteristic line? |
| A. | du + \(\frac {dp}{ρa}\) = 0 |
| B. | du – \(\frac {dp}{ρa}\) = 0 |
| C. | \(\frac {dpu}{ρa}\) = 0 |
| D. | \(\frac {du}{ρa}\) = 0 |
| Answer» B. du – \(\frac {dp}{ρa}\) = 0 | |
| 7. |
Which of these is not a property of finite wave? |
| A. | The perturbations are large |
| B. | Wave shape changes |
| C. | Linear equations are used to govern the flow variables |
| D. | Wave propagates with added local speed and speed of sound |
| Answer» D. Wave propagates with added local speed and speed of sound | |
| 8. |
What is the region in a finite wave called where density increases? |
| A. | Compression region |
| B. | Expansion region |
| C. | Linearized region |
| D. | Propagating region |
| Answer» B. Expansion region | |
| 9. |
Finite wave’s properties such as density, velocity are a function of distance. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 10. |
What are finite waves? |
| A. | Waves with large perturbations |
| B. | Sound waves |
| C. | Weak waves |
| D. | Waves with small temperature fluctuations |
| Answer» B. Sound waves | |