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. |
Direct Numerical Simulation of turbulent flows become difficult because of ____________ |
| A. | Viscosity scales |
| B. | Time and length scales |
| C. | Energy scales |
| D. | Velocity scales |
| Answer» C. Energy scales | |
| 2. |
Dissipation in turbulent flows converts ____________ energy to ____________ energy. |
| A. | kinetic, internal |
| B. | internal, kinetic |
| C. | kinetic, viscous |
| D. | viscous, kinetic |
| Answer» B. internal, kinetic | |
| 3. |
The various fluid parcels come into contact in turbulent flow by ___________ |
| A. | Turbulent energy transfer |
| B. | Turbulent vorticity |
| C. | Turbulent dissipation |
| D. | Turbulent diffusion |
| Answer» E. | |
| 4. |
Methods of time-averaging statistics are applicable only to ___________ |
| A. | Free turbulent structures |
| B. | Boundary layer turbulent structures |
| C. | Coherent turbulent structures |
| D. | Incoherent turbulent structures |
| Answer» D. Incoherent turbulent structures | |
| 5. |
For a turbulent flow, which of these is correct? |
| A. | Fluctuating pressure is equal everywhere |
| B. | Fluctuating velocity and pressure are not equal everywhere |
| C. | Fluctuating velocity and pressure are equal everywhere |
| D. | Fluctuating velocity is equal everywhere |
| Answer» C. Fluctuating velocity and pressure are equal everywhere | |
| 6. |
The structure of free turbulent flow is controlled by ___________ |
| A. | Only the local environment |
| B. | The source |
| C. | The sink |
| D. | The source along with the local environment |
| Answer» B. The source | |
| 7. |
Consider the turbulent structure of thin shear layers. Which of these statements is correct? |
| A. | The rates of change of the flow variables are very high in every direction |
| B. | Flow variables do not vary much in any direction |
| C. | The rates of change of the flow variables in the cross-sectional direction are smaller than that of the flow direction |
| D. | The rates of change of the flow variables in the flow direction are smaller than that of the cross-sectional direction |
| Answer» E. | |
| 8. |
The details about the structure of the fluctuations are contained in ___________ |
| A. | sum of different variables |
| B. | sum of different pairs of variables |
| C. | moments of different pairs of variables |
| D. | moments of different variables |
| Answer» D. moments of different variables | |
| 9. |
According to Kolmogorov, the structure of the smallest eddies depends on ___________ |
| A. | rate of dissipation of kinetic energy |
| B. | rate of dissipation of turbulent energy |
| C. | rate of convection of kinetic energy |
| D. | rate of convection of turbulent energy |
| Answer» C. rate of convection of kinetic energy | |
| 10. |
The rotational flow structure of turbulent flows is termed as ___________ |
| A. | Turbulent eddies |
| B. | Haida eddies |
| C. | Whirlpool |
| D. | Wake turbulence |
| Answer» B. Haida eddies | |