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. |
Diffusion terms are not included in ____ of the Navier-Stokes equations. |
| A. | continuity equation |
| B. | y-momentum equation |
| C. | z-momentum equation |
| D. | energy equation |
| Answer» D. energy equation | |
| 2. |
The major difference between the Navier-Stokes equations and the Euler equations is the dissipative transport phenomena. The impact of this phenomena in a system is ____ |
| A. | They decrease entropy |
| B. | They increase entropy |
| C. | They increase internal energy |
| D. | They decrease internal energy |
| Answer» C. They increase internal energy | |
| 3. |
Which is the diffusion terms of the y-momentum equation? |
| A. | \(\frac{\partial\tau_{xy}}{\partial x}+\frac{\partial\tau_{yy}}{\partial y}+\frac{\partial\tau_{zy}}{\partial z}\) |
| B. | \(\frac{\partial\tau_{yx}}{\partial x}+\frac{\partial\tau_{yy}}{\partial y}+\frac{\partial\tau_{yz}}{\partial z}\) |
| C. | \(\frac{\partial\tau_{xx}}{\partial x}+\frac{\partial\tau_{yx}}{\partial x}+\frac{\partial\tau_{zx}}{\partial x}\) |
| D. | \(\frac{\partial\tau_{xy}}{\partial y}+\frac{\partial\tau_{yy}}{\partial y}+\frac{\partial\tau_{zy}}{\partial y}\) |
| Answer» B. \(\frac{\partial\tau_{yx}}{\partial x}+\frac{\partial\tau_{yy}}{\partial y}+\frac{\partial\tau_{yz}}{\partial z}\) | |
| 4. |
The viscosity terms in x-momentum equation is \(\frac{\partial\tau_{xx}}{\partial x}+\frac{\partial\tau_{yx}}{\partial y}+\frac{\partial\tau_{zx}}{\partial z}\). In a more general form, this becomes div(μ gradu). Which of these relations is used for this transformation? |
| A. | Thermodynamic relations |
| B. | Stress-strain relations |
| C. | Fluid flow relations |
| D. | Geometric relations |
| Answer» C. Fluid flow relations | |
| 5. |
The diffusion term in the general transport equation is div(Γgradφ). While equating this with the Navier-Stokes equations, what is Γ? |
| A. | k |
| B. | λ |
| C. | μ |
| D. | \(\vec{V}\) |
| Answer» D. \(\vec{V}\) | |
| 6. |
The Navier-Stokes equations are ____ system of equations. |
| A. | coupled |
| B. | uncoupled |
| C. | exponential |
| D. | radical |
| Answer» B. uncoupled | |
| 7. |
Turbulence problems particularly depend on this term of the Navier-Stokes equations. Which is that term? |
| A. | Rate of change term |
| B. | Convection term |
| C. | Diffusion term |
| D. | Source term |
| Answer» D. Source term | |
| 8. |
The Navier-Stokes equations are all partial differential equations. What will be the best reason behind this? |
| A. | Ordinary differentials are not present in the Navier-Stokes equations |
| B. | The dependent variables are functions of all of the independent variables |
| C. | Each dependent variable depends on only one of the independent variables |
| D. | Partial differentials are only present in the Navier-Stokes equations |
| Answer» C. Each dependent variable depends on only one of the independent variables | |
| 9. |
What are the dependent variables in the Navier-Stokes equations? |
| A. | τ,T,p,ρ |
| B. | p,ρ,T |
| C. | u,v,w,T,p,ρ |
| D. | u,v,w,T,p |
| Answer» D. u,v,w,T,p | |
| 10. |
What are the independent variables in the Navier-Stokes equations? |
| A. | x, y, z, ρ |
| B. | x, y, z, τ |
| C. | x, y, z, t, ρ |
| D. | x, y, z, t |
| Answer» E. | |