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 of these following is used to match the outlet and inlet flow velocities? |
| A. | u<sub>N,j</sub> = u<sub>N-1,j</sub> ( frac{M_{in}}{M_{out}} ) |
| B. | u<sub>N-1,j</sub> = u<sub>N,j</sub> ( frac{M_{in}}{M_{out}} ) |
| C. | u<sub>N-1,j</sub> = u<sub>N,j</sub> ( frac{M_{out}}{M_{in}} ) |
| D. | u<sub>N,j</sub> = u<sub>N-1,j</sub> ( frac{M_{out}}{M_{in}} ) |
| Answer» B. u<sub>N-1,j</sub> = u<sub>N,j</sub> ( frac{M_{in}}{M_{out}} ) | |
| 2. |
The mass flux out should be equal to the mass flux in. This is in accordance with _________ |
| A. | energy conservation |
| B. | momentum conservation |
| C. | continuity condition |
| D. | flux conservation |
| Answer» D. flux conservation | |
| 3. |
Which of these statements is false regarding the pressure correction at boundaries? |
| A. | Pressure reference is set at the inlet boundaries |
| B. | Pressure reference is set at the outlet boundaries |
| C. | The link to the inlet boundary side is suppressed |
| D. | The link to the outlet boundary side is suppressed |
| Answer» C. The link to the inlet boundary side is suppressed | |
| 4. |
Which of these is the best practice regarding outlet boundaries? |
| A. | Outlet boundaries should be at the exact outlet of the geometry |
| B. | Outlet boundaries should be set as close as possible to the inlet boundaries |
| C. | Outlet boundaries should be set as far as possible to the physical geometry |
| D. | Outlet boundaries should be set as close as possible to the physical geometry |
| Answer» D. Outlet boundaries should be set as close as possible to the physical geometry | |
| 5. |
If we are solving a k- model, the values of k and _________ |
| A. | are either specified or estimated at the inlet |
| B. | are either specified or estimated at the outlet |
| C. | need not be specified or estimated anywhere |
| D. | are not estimated |
| Answer» B. are either specified or estimated at the outlet | |
| 6. |
_________ is fixed at one inlet node and pressure correction is set to _________ in that node. |
| A. | Gauge pressure, one |
| B. | Absolute pressure, one |
| C. | Gauge pressure, zero |
| D. | Absolute pressure, zero |
| Answer» E. | |
| 7. |
An extra grid is used before the physical boundary. What is the use of this grid? |
| A. | To store the inlet boundary values |
| B. | To solve the discretized equation |
| C. | To calculate the inlet boundary values |
| D. | To solve the system analytically |
| Answer» B. To solve the discretized equation | |
| 8. |
The diffusive fluxes in the inlet boundary conditions _________ |
| A. | are specified |
| B. | can be calculated |
| C. | are not necessary |
| D. | should be approximated |
| Answer» E. | |
| 9. |
The convective fluxes in the inlet boundary layer _________ |
| A. | are specified |
| B. | can be calculated |
| C. | should be approximated |
| D. | are not necessary |
| Answer» C. should be approximated | |
| 10. |
Usually, in the inlet boundary conditions ___________ are known. |
| A. | gradients of flow properties |
| B. | diffusive fluxes of properties |
| C. | convective fluxes of properties |
| D. | flow properties |
| Answer» E. | |