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. |
To make the spectral method advantageous _____________ |
| A. | Function must be periodic but grids can be non-uniform |
| B. | Grids should be uniform and function must be periodic |
| C. | Grids should be uniform but function can be non-periodic |
| D. | Grids should be structured and function must be periodic |
| Answer» C. Grids should be uniform but function can be non-periodic | |
| 2. |
What is the cost of computation of FFT? (Note: ‘N’ is the number of grid points). |
| A. | N |
| B. | log N |
| C. | N log N |
| D. | \(\frac{N^2}{2} \) |
| Answer» D. \(\frac{N^2}{2} \) | |
| 3. |
The cost of computation for Fourier coefficients can be reduced by ___________ |
| A. | FFT |
| B. | DFT |
| C. | IDFT |
| D. | IFT |
| Answer» B. DFT | |
| 4. |
The cost of computing the Fourier coefficients is ___________ (Note: ‘N’ is the number of grid points). |
| A. | N3 |
| B. | N2 |
| C. | \(\frac{N^2}{2} \) |
| D. | \(\frac{N^3}{3} \) |
| Answer» C. \(\frac{N^2}{2} \) | |
| 5. |
Spectral methods are much more accurate than the Finite Difference methods ___________ |
| A. | unconditionally |
| B. | conditionally depending on the problem taken |
| C. | conditionally when the number of grid points is small |
| D. | conditionally when grid size is small |
| Answer» E. | |
| 6. |
For higher order derivatives, spectral methods ___________ |
| A. | can be easily generated |
| B. | are not suitable |
| C. | difficult to generate |
| D. | become invalid |
| Answer» B. are not suitable | |
| 7. |
What is the advantage of using fourier series in the spectral method? |
| A. | Less grid size |
| B. | Large number of grid points |
| C. | Continuous results |
| D. | Flexibility |
| Answer» D. Flexibility | |
| 8. |
What causes aliasing in Spectral methods? |
| A. | Small grid sizes |
| B. | Fourier series |
| C. | Arbitrary values for Fourier series |
| D. | Periodic nature |
| Answer» D. Periodic nature | |
| 9. |
Spectral methods use ___________ |
| A. | Fourier series |
| B. | Taylor series |
| C. | McLaurin series |
| D. | Laurent series |
| Answer» B. Taylor series | |
| 10. |
Spectral methods are particularly suitable for __________ |
| A. | Subsonic flows |
| B. | Boundary layer flows |
| C. | Compressible flows |
| D. | Turbulence modelling |
| Answer» E. | |