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. |
Which type of grids is the best for flow over an airfoil? |
| A. | Stretched grids |
| B. | Adaptive grids |
| C. | Boundary-fitted grids |
| D. | Elliptic grids |
| Answer» D. Elliptic grids | |
| 2. |
What are zonal grids? |
| A. | Grids generated for a particular zone of the domain of interest |
| B. | Grids varying at different zones |
| C. | Grids generated for a particular time in the flow |
| D. | Grids varying with time |
| Answer» B. Grids varying at different zones | |
| 3. |
What does elliptic grid generation mean? |
| A. | Grids generated for elliptic equations |
| B. | Grids transformed with elliptic equations |
| C. | The computational domain is elliptic |
| D. | The object under consideration is elliptic |
| Answer» C. The computational domain is elliptic | |
| 4. |
Which of these properties are balanced by using adaptive grids? |
| A. | Accuracy and convergence |
| B. | Efficiency and stability |
| C. | Accuracy and stability |
| D. | Accuracy and efficiency |
| Answer» E. | |
| 5. |
Let x, y be the coordinates in the physical domain and ξ, η be the coordinates in the computational domain. Which of these is correct for adaptive grids? |
| A. | \(\frac{\partial\xi}{\partial x}≠1 \) |
| B. | \(\frac{\partial\xi}{\partial x}≠0 \) |
| C. | \(\frac{\partial\xi}{\partial t}≠0 \) |
| D. | \(\frac{\partial\xi}{\partial t}≠1 \) |
| Answer» D. \(\frac{\partial\xi}{\partial t}≠1 \) | |
| 6. |
Adaptive grids change automatically based on ______________ |
| A. | flow field gradients |
| B. | time rate of change of the flow properties |
| C. | grid gradients |
| D. | time rate of change of the grid points |
| Answer» B. time rate of change of the flow properties | |
| 7. |
Consider a divergent nozzle as shown in the figure. Let x, y be the coordinates in the physical domain and ξ, η be the coordinates in the computational domain. Which of these equations can give the best-suited grid for this system? |
| A. | ξ=x; η = y×ys |
| B. | ξ=x×ys; η=y×ys |
| C. | \(\xi=\frac{x}{y_s};\eta=\frac{y}{y_s}\) |
| D. | \(\xi=x;\eta=\frac{y}{y_s}\) |
| Answer» E. | |
| 8. |
Form the continuity equation for steady 2-dimensional flow when the x-direction grids are stretched.Density → ρx and y-velocities → u,vCoordinates in physical domain → x,yCoordinates in computational domain → ξ, η. |
| A. | \(e^\eta\frac{\partial(\rho u)}{\partial\xi}+\frac{\partial(\rho v)}{\partial\eta}\) |
| B. | \(\frac{\partial(\rho u)}{\partial\xi}+e^\xi\frac{\partial(\rho v)}{\partial\eta}\) |
| C. | \(\frac{\partial(\rho u)}{\partial\xi}+e^\eta\frac{\partial(\rho v)}{\partial\eta}\) |
| D. | \(e^\xi\frac{\partial(\rho u)}{\partial\xi}+\frac{\partial(\rho v)}{\partial\eta}\) |
| Answer» C. \(\frac{\partial(\rho u)}{\partial\xi}+e^\eta\frac{\partial(\rho v)}{\partial\eta}\) | |
| 9. |
Let x, y be the coordinates in the physical domain and ξ, η be the coordinates in the computational domain. In which of these cases, the horizontal lines are stretched and the vertical lines are equally spaced? |
| A. | ξ=x; η=ln(y+1) |
| B. | ξ=ln(x+1); η=y |
| C. | ξ=x; η=y |
| D. | ξ=ln(x+1); η=ln(y+1) |
| Answer» B. ξ=ln(x+1); η=y | |
| 10. |
Which of these analyses needs a stretched grid? |
| A. | Transient flow over a flat plate |
| B. | Incompressible flow over a flat plate |
| C. | Viscous flow over a flat plate |
| D. | Subsonic flow over a flat plate |
| Answer» D. Subsonic flow over a flat plate | |