MCQOPTIONS
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MCQOPTIONS
This section includes 9 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. |
Viscous forces fall into which kind of the following forces acting on a body? |
| A. | Pressure force |
| B. | Tensile force |
| C. | Body forces |
| D. | Surface forces |
| Answer» D. Surface forces | |
| 2. |
Express ( tau_{yz} ) in terms of velocity gradients. |
| A. | ( tau_{yz}= ( frac{ partial v}{ partial z}+ frac{ partial w}{ partial y}) ) |
| B. | ( tau_{yz}= ( frac{ partial u}{ partial z}+ frac{ partial u}{ partial y}) ) |
| C. | ( tau_{yz}= ( frac{ partial v}{ partial x}+ frac{ partial w}{ partial x}) ) |
| D. | ( tau_{yz}= ( frac{ partial w}{ partial z}+ frac{ partial v}{ partial y}) ) |
| Answer» B. ( tau_{yz}= ( frac{ partial u}{ partial z}+ frac{ partial u}{ partial y}) ) | |
| 3. |
Express the shear stress tensor( ) of a three-dimensional fluid flow element in terms of the velocity vector(v). |
| A. | ( tau= mu left {( nabla vec{v})^T right }+ lambda( nabla. vec{v})I ) |
| B. | ( tau= mu left {( nabla vec{v}) right }+ lambda( nabla. vec{v})I ) |
| C. | ( tau= mu left {( nabla vec{v})^T+( nabla. vec{v})^T right } ) |
| D. | ( tau= mu left {( nabla vec{v})^T+( nabla. vec{v})^T right }+ lambda( nabla. vec{v})I ) |
| Answer» E. | |
| 4. |
What is the relationship between bulk viscosity coefficient ( ) and the dynamic viscosity coefficient ( )? |
| A. | = (- frac{2}{3} ) |
| B. | = ( frac{2}{3} ) |
| C. | = (- frac{1}{3} ) |
| D. | = (- frac{1}{2} ) |
| Answer» B. = ( frac{2}{3} ) | |
| 5. |
What are the two viscosity coefficients involved in the relationship between stress tensor and strain rate of fluids? |
| A. | Kinematic viscosity and bulk viscosity |
| B. | Dynamic viscosity and kinematic viscosity |
| C. | Dynamic viscosity and bulk viscosity |
| D. | Kinematic viscosity and volume viscosity |
| Answer» D. Kinematic viscosity and volume viscosity | |
| 6. |
The divergence of the stress tensor is _____ |
| A. | Scalar |
| B. | Vector |
| C. | 0 |
| D. | 1 |
| Answer» C. 0 | |
| 7. |
Which of these fluids have their stress tensor linearly varying to the strain rate? |
| A. | <a href="https://www.sanfoundry.com/wp-content/uploads/2019/10/computational-fluid-dynamics-questions-answers-stress-strain-tensor-q3a.png"><img alt="The fluids have their stress tensor linearly varying to the strain rate - option a" class="alignnone size-full wp-image-248683" height="160" src="https://www.sanfoundry.com/wp-content/uploads/2019/10/computational-fluid-dynamics-questions-answers-stress-strain-tensor-q3a.png" width="154"/></a> |
| B. | <a href="https://www.sanfoundry.com/wp-content/uploads/2019/10/computational-fluid-dynamics-questions-answers-stress-strain-tensor-q3b.png"><img alt="The fluids have their stress tensor linearly varying to the strain rate - option b" class="alignnone size-full wp-image-248684" height="168" src="https://www.sanfoundry.com/wp-content/uploads/2019/10/computational-fluid-dynamics-questions-answers-stress-strain-tensor-q3b.png" width="155"/></a> |
| C. | <a href="https://www.sanfoundry.com/wp-content/uploads/2019/10/computational-fluid-dynamics-questions-answers-stress-strain-tensor-q3c.png"><img alt="The fluids have their stress tensor linearly varying to the strain rate - option c" class="alignnone size-full wp-image-248685" height="157" src="https://www.sanfoundry.com/wp-content/uploads/2019/10/computational-fluid-dynamics-questions-answers-stress-strain-tensor-q3c.png" width="143"/></a> |
| D. | <a href="https://www.sanfoundry.com/wp-content/uploads/2019/10/computational-fluid-dynamics-questions-answers-stress-strain-tensor-q3d.png"><img alt="The fluids have their stress tensor linearly varying to the strain rate - option d" class="alignnone size-full wp-image-248686" height="159" src="https://www.sanfoundry.com/wp-content/uploads/2019/10/computational-fluid-dynamics-questions-answers-stress-strain-tensor-q3d.png" width="151"/></a> |
| Answer» E. | |
| 8. |
What do the two subscripts of stress tensors represent? |
| A. | Directions of stress and strain |
| B. | Directions of stress and normal to the surface on which they are acting |
| C. | Directions of strain and normal to the surface on which they are acting |
| D. | Direction of stress and the flow direction |
| Answer» C. Directions of strain and normal to the surface on which they are acting | |
| 9. |
Which among these forces used in momentum equation is a tensor? |
| A. | Gravitational forces |
| B. | Pressure forces |
| C. | Viscous forces |
| D. | Electromagnetic forces |
| Answer» D. Electromagnetic forces | |