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. |
If κ is the wavenumber and ε is the rate of dissipation of turbulent energy, which of these is proportional to the spectral energy of the inertial sub-range of turbulence? |
| A. | κ-5/3ε-2/3 |
| B. | κ5/3ε-2/3 |
| C. | κ5/3ε2/3 |
| D. | κ-5/3ε2/3 |
| Answer» E. | |
| 2. |
_____________ are called the inertial sub-range of turbulence. |
| A. | Kolmogorov micro-scale |
| B. | Small scale eddies |
| C. | Intermediate scale eddies |
| D. | Large scale eddies |
| Answer» D. Large scale eddies | |
| 3. |
____________ is associated with high wavenumbers. |
| A. | Conduction |
| B. | Dissipation |
| C. | Kinetic energy |
| D. | Potential energy |
| Answer» C. Kinetic energy | |
| 4. |
The size of the eddies and the wavenumber are __________ |
| A. | inversely proportional |
| B. | directly proportional |
| C. | not related to each other |
| D. | related but it varies according to the energy |
| Answer» B. directly proportional | |
| 5. |
If ν is the kinematic viscosity and ε is the rate of dissipation of turbulent energy, to which of these terms is the spectral energy of Kolmogorov micro-scale eddies proportional to? |
| A. | ν5/3 ε1/3 |
| B. | ν3/2 ε1/2 |
| C. | ν1/2 ε3/2 |
| D. | ν5/4 ε1/4 |
| Answer» E. | |
| 6. |
What is the range of length and frequency of the Kolmogorov micro-scale eddies respectively? |
| A. | 0.1 to 1 mm, around 1 kHz |
| B. | 1-10 mm, around 10 kHz |
| C. | 0.01 to 0.1 mm, around 10 kHz |
| D. | around 10 mm, 0.1 to 0.01 kHz |
| Answer» D. around 10 mm, 0.1 to 0.01 kHz | |
| 7. |
What is the unit of spectral energy? |
| A. | \(\frac{m}{s^2}\) |
| B. | \(\frac{m^3}{s^2}\) |
| C. | \(\frac{m^2}{s^3}\) |
| D. | \(\frac{m^2}{s^2}\) |
| Answer» C. \(\frac{m^2}{s^3}\) | |
| 8. |
Spectral energy is equal to ___________ |
| A. | Kinetic energy per unit mass per unit wavenumber |
| B. | Rate of dissipation of turbulent energy per unit mass per unit wavenumber |
| C. | Rate of dissipation of turbulent energy per unit wavenumber |
| D. | Kinetic energy per unit wavenumber |
| Answer» B. Rate of dissipation of turbulent energy per unit mass per unit wavenumber | |
| 9. |
Kolmogorov spectral energy is a function of ____________ |
| A. | Velocity |
| B. | Wavenumber |
| C. | Kinematic viscosity |
| D. | Dynamic viscosity |
| Answer» C. Kinematic viscosity | |
| 10. |
Kolmogorov micro-scales can be expressed in terms of ___________ |
| A. | Rate of dissipation of turbulent energy and fluid viscosity |
| B. | Turbulent energy and fluid velocity |
| C. | Fluid velocity and viscosity |
| D. | Turbulent energy and fluid viscosity |
| Answer» B. Turbulent energy and fluid velocity | |