MCQOPTIONS
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MCQOPTIONS
This section includes 8 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 terms represent convection in the momentum equation? |
| A. | \(div(u\vec{V})\) |
| B. | \(div(\rho \vec{V})\) |
| C. | \(\nabla .(u\vec{V})\) |
| D. | \(div(\rho u\vec{V})\) |
| Answer» E. | |
| 2. |
The momentum equation is \( \rho\frac{Du}{Dt}=-\frac{\partial p}{\partial x}+\frac{\partial \tau_{xx}}{\partial x}+\frac{\partial \tau_{yx}}{\partial y}+\frac{\partial \tau_{zx}}{\partial z}+\rho f_x\). Which of these statements about sign convention can be inferred from this equation? |
| A. | Pressure force is taken as negative |
| B. | Tensile force is taken as negative |
| C. | Pressure force is taken as positive |
| D. | Pressure force is unsigned |
| Answer» B. Tensile force is taken as negative | |
| 3. |
I am using an infinitesimally small element of fluid moving along with the flow as my model. What is the acceleration of this model in x-direction? |
| A. | \(a_x=\frac{D\vec{V}}{Dt}\) |
| B. | \(a_x=\frac{\partial \vec{V}}{\partial t}\) |
| C. | \(a_x=\frac{Du}{Dt}\) |
| D. | \(a_x=\frac{\partial u}{\partial t}\) |
| Answer» D. \(a_x=\frac{\partial u}{\partial t}\) | |
| 4. |
The source term in the momentum equation is ________ |
| A. | Pressure force |
| B. | Body forces |
| C. | Viscous force |
| D. | Acceleration |
| Answer» C. Viscous force | |
| 5. |
The physical property Φ of the general transport equation is replaced by ________ to get momentum equation. |
| A. | Velocity vector |
| B. | Mass |
| C. | Force vector |
| D. | Acceleration vector |
| Answer» B. Mass | |
| 6. |
Consider the element shown in the diagram. In diagram,p → pressure\(p+\frac{\Delta p}{\Delta x}dx=p+\frac{\partial p}{\partial x}dx\) dx, day, dz → dimensions in x, y and z directions What is the net pressure force in x direction? |
| A. | \(-\frac{\partial p}{\partial x}\) |
| B. | \(\frac{\partial p}{\partial x}\) |
| C. | \(\frac{\partial p}{\partial x}dx \,dy \,dz\) |
| D. | \(-\frac{\partial p}{\partial x}dx \,dy \,dz\) |
| Answer» E. | |
| 7. |
Consider an element shown below. S is the source term. If gravitational force is the only force acting on this element. Which of these following is correct? |
| A. | Sx=mg, Sy=0, Sz=mg |
| B. | Sx=0, Sy=0, Sz=mg |
| C. | Sy=0, Sz=0, Sx=mg |
| D. | Sz=0, Sx=0, Sy=mg |
| Answer» E. | |
| 8. |
What is the physical principle behind momentum equation? |
| A. | Newton’s second law of motion |
| B. | Newton’s first law of motion |
| C. | Zeroth law of thermodynamics |
| D. | First law of thermodynamics |
| Answer» B. Newton’s first law of motion | |