MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Computational Fluid Dynamics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The formula to find ω from the k-value obtained using the turbulence intensity is ____________ |
| A. | ω=\(\frac{k^{3/2}}{l^2}\) |
| B. | ω=\(\frac{k^{3/2}}{l}\) |
| C. | ω=\(\frac{k^{1/2}}{l^2} \) |
| D. | ω=\(\frac{k^{1/2}}{l}\) |
| Answer» E. | |
| 2. |
The range of values of the turbulent kinetic energy is ___________ |
| A. | 50 to 75% |
| B. | 11 to 20% |
| C. | 1 to 10% |
| D. | 0 to 1% |
| Answer» D. 0 to 1% | |
| 3. |
The relationship between the turbulence intensity Ti and the turbulence kinetic energy k is given by ___________ |
| A. | k=\(\frac{1}{2}T_i(\vec{v}.\vec{v})\) |
| B. | k=\(\frac{1}{2}T_i^2(\vec{v}.\vec{v})\) |
| C. | k=\(\frac{1}{2}T_i^2(\vec{v}.\vec{v})\) |
| D. | k=\(\frac{1}{2T_i}(\vec{v}.\vec{v})\) |
| Answer» C. k=\(\frac{1}{2}T_i^2(\vec{v}.\vec{v})\) | |
| 4. |
Which of these equations give the turbulence intensity? |
| A. | \(\frac{\sqrt{\overline{\vec{V}^{‘}.\vec{V}^{‘}}}}{\sqrt{\vec{V}.\vec{V}}}\) |
| B. | \(\frac{\sqrt{\vec{V}.\vec{V}}}{\sqrt{\overline{\vec{V}^{‘}.\vec{V}^{‘}}}}\) |
| C. | \(\frac{\sqrt{\overline{\vec{V}^{‘}}}}{\sqrt{\vec{V}}}\) |
| D. | \(\frac{\sqrt{\vec{V}}}{\sqrt{\overline{\vec{V}^{‘}}}}\) |
| Answer» B. \(\frac{\sqrt{\vec{V}.\vec{V}}}{\sqrt{\overline{\vec{V}^{‘}.\vec{V}^{‘}}}}\) | |
| 5. |
Which of these is correct about the first internal node of a k-ε model? |
| A. | k-equation is not solved |
| B. | ε-equation is not solved |
| C. | Both k and ε-equations are not solved |
| D. | Both k and ε-equations are solved simultaneously |
| Answer» C. Both k and ε-equations are not solved | |
| 6. |
When k and ε values are not available, for inlet boundary conditions, they are ____________ |
| A. | obtained from turbulence intensity |
| B. | assumed to be zero |
| C. | assumed to be unity |
| D. | obtained from Reynolds number |
| Answer» B. assumed to be zero | |
| 7. |
In the low Reynolds number turbulence models, the first internal grid point is placed in the ___________ |
| A. | log-law layer |
| B. | buffer layer |
| C. | inertial sub-layer |
| D. | viscous sub-layer |
| Answer» E. | |
| 8. |
Which of these values vanish near the wall boundary? |
| A. | Velocity and turbulent viscosity |
| B. | Velocity and Reynolds number |
| C. | Velocity and k-value |
| D. | k-value and Reynolds number |
| Answer» D. k-value and Reynolds number | |
| 9. |
Boundary conditions near the solid-walls for a k-ε model depends on ___________ |
| A. | Eddy viscosity |
| B. | Reynolds number |
| C. | ε-value |
| D. | k-value |
| Answer» C. ε-value | |
| 10. |
If n is the spatial coordinate, in the outlet or symmetry boundaries, which of these following is correct for a k-ε model? |
| A. | \(\frac{\partial k}{\partial n}=0; \frac{\partial\varepsilon}{\partial n}=0\) |
| B. | \(\frac{\partial^2 k}{\partial n^2}=0; \frac{\partial\varepsilon}{\partial n}=0\) |
| C. | \(\frac{\partial k}{\partial n}=0; \frac{\partial^2 \varepsilon}{\partial n^2}=0\) |
| D. | \(\frac{\partial ^2 k}{\partial n^2}=0; \frac{\partial^2 \varepsilon}{\partial n^2}=0\) |
| Answer» B. \(\frac{\partial^2 k}{\partial n^2}=0; \frac{\partial\varepsilon}{\partial n}=0\) | |