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. |
Which of these models is a hybrid of LES and RANS? |
| A. | DNS model |
| B. | DES model |
| C. | WALE model |
| D. | RNG LES model |
| Answer» C. WALE model | |
| 2. |
Which of these models solves turbulent kinetic energy and specific dissipation? |
| A. | K omega model |
| B. | K epsilon model |
| C. | RANS model |
| D. | RNG LES model |
| Answer» B. K epsilon model | |
| 3. |
Which of these is a two equation model? |
| A. | Baldwin Lomax model |
| B. | Prandtl s equation model |
| C. | Spalart Allmaras model |
| D. | K Epsilon model |
| Answer» E. | |
| 4. |
One equation turbulence model account for the history effects such as turbulent energy, diffusion and convection. |
| A. | True |
| B. | False |
| Answer» C. | |
| 5. |
Which of these models compute large vortexes directly while neglecting small scale eddies? |
| A. | DNS |
| B. | LES |
| C. | RANS |
| D. | FANS |
| Answer» C. RANS | |
| 6. |
What are the shortcomings of DNS? |
| A. | Possible for low Reynolds number |
| B. | Low scale resolution |
| C. | Time consuming |
| D. | Possible for high Reynolds number |
| Answer» B. Low scale resolution | |
| 7. |
Why are turbulence models used? |
| A. | Define reynolds stress for closure problems |
| B. | Model hypersonic flows |
| C. | Lack of system to accurately find turbulent flow characteristic |
| D. | Closure of continuity equation |
| Answer» B. Model hypersonic flows | |
| 8. |
Turbulent boundary layer is considered to be a combination of inner and outer layer. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
What is the skin friction drag for an incompressible turbulent flow with Reynolds number = 1.5 107 over a flat plate? |
| A. | 2.72 10<sup>-3</sup> |
| B. | 5.41 10<sup>-3</sup> |
| C. | 3.82 10<sup>-3</sup> |
| D. | 2.91 10<sup>-3</sup> |
| Answer» B. 5.41 10<sup>-3</sup> | |
| 10. |
How does the turbulent boundary layer vary with respect to the Reynolds number? |
| A. | Re<sub>x</sub><sup> ( frac {1}{5} )</sup> |
| B. | Re<sub>x</sub><sup> ( frac {1}{4} )</sup> |
| C. | Re<sub>x</sub><sup> ( frac {1}{2} )</sup> |
| D. | Re<sub>x</sub><sup>-2</sup> |
| Answer» B. Re<sub>x</sub><sup> ( frac {1}{4} )</sup> | |