MCQOPTIONS
Saved Bookmarks
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. |
When I derived the momentum equation in x-direction, I got this equation (directly without any manipulation) ( 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 models have I used? |
| A. | <a href="https://www.sanfoundry.com/wp-content/uploads/2019/10/computational-fluid-dynamics-questions-answers-momentum-equation-q8a.png"><img alt="The momentum equation in x-direction is differential non-conservative - option a" class="alignnone size-full wp-image-248861" height="145" sizes="(max-width: 326px) 100vw, 326px" src="https://www.sanfoundry.com/wp-content/uploads/2019/10/computational-fluid-dynamics-questions-answers-momentum-equation-q8a.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2019/10/computational-fluid-dynamics-questions-answers-momentum-equation-q8a.png 326w, https://www.sanfoundry.com/wp-content/uploads/2019/10/computational-fluid-dynamics-questions-answers-momentum-equation-q8a-300x133.png 300w" width="326"/></a> |
| B. | <a href="https://www.sanfoundry.com/wp-content/uploads/2019/10/computational-fluid-dynamics-questions-answers-momentum-equation-q8b.png"><img alt="The momentum equation in x-direction is differential non-conservative - option b" class="alignnone size-full wp-image-248862" height="151" sizes="(max-width: 326px) 100vw, 326px" src="https://www.sanfoundry.com/wp-content/uploads/2019/10/computational-fluid-dynamics-questions-answers-momentum-equation-q8b.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2019/10/computational-fluid-dynamics-questions-answers-momentum-equation-q8b.png 326w, https://www.sanfoundry.com/wp-content/uploads/2019/10/computational-fluid-dynamics-questions-answers-momentum-equation-q8b-300x139.png 300w" width="326"/></a> |
| C. | <a href="https://www.sanfoundry.com/wp-content/uploads/2019/10/computational-fluid-dynamics-questions-answers-momentum-equation-q8c.png"><img alt="The momentum equation in x-direction is differential non-conservative - option c" class="alignnone size-full wp-image-248863" height="140" sizes="(max-width: 330px) 100vw, 330px" src="https://www.sanfoundry.com/wp-content/uploads/2019/10/computational-fluid-dynamics-questions-answers-momentum-equation-q8c.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2019/10/computational-fluid-dynamics-questions-answers-momentum-equation-q8c.png 330w, https://www.sanfoundry.com/wp-content/uploads/2019/10/computational-fluid-dynamics-questions-answers-momentum-equation-q8c-300x127.png 300w" width="330"/></a> |
| D. | <a href="https://www.sanfoundry.com/wp-content/uploads/2019/10/computational-fluid-dynamics-questions-answers-momentum-equation-q8d.png"><img alt="The momentum equation in x-direction is differential non-conservative - option d" class="alignnone size-full wp-image-248864" height="135" sizes="(max-width: 310px) 100vw, 310px" src="https://www.sanfoundry.com/wp-content/uploads/2019/10/computational-fluid-dynamics-questions-answers-momentum-equation-q8d.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2019/10/computational-fluid-dynamics-questions-answers-momentum-equation-q8d.png 310w, https://www.sanfoundry.com/wp-content/uploads/2019/10/computational-fluid-dynamics-questions-answers-momentum-equation-q8d-300x131.png 300w" width="310"/></a> |
| Answer» C. <a href="https://www.sanfoundry.com/wp-content/uploads/2019/10/computational-fluid-dynamics-questions-answers-momentum-equation-q8c.png"><img alt="The momentum equation in x-direction is differential non-conservative - option c" class="alignnone size-full wp-image-248863" height="140" sizes="(max-width: 330px) 100vw, 330px" src="https://www.sanfoundry.com/wp-content/uploads/2019/10/computational-fluid-dynamics-questions-answers-momentum-equation-q8c.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2019/10/computational-fluid-dynamics-questions-answers-momentum-equation-q8c.png 330w, https://www.sanfoundry.com/wp-content/uploads/2019/10/computational-fluid-dynamics-questions-answers-momentum-equation-q8c-300x127.png 300w" width="330"/></a> | |
| 4. |
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} ) | |
| 5. |
The source term in the momentum equation is ________ |
| A. | Pressure force |
| B. | Body forces |
| C. | Viscous force |
| D. | Acceleration |
| Answer» C. Viscous force | |
| 6. |
The physical property 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 | |
| 7. |
Which of these statements hold true? |
| A. | Momentum conservation is applicable to neither individual directions nor the whole system |
| B. | Momentum conservation is applicable to the whole system but not individually |
| C. | Momentum conservation is applicable to both individual directions and the whole system |
| D. | Momentum conservation is applicable only to the three directions individually |
| Answer» D. Momentum conservation is applicable only to the three directions individually | |
| 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 | |