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. | \(\tau_{yz}=μ(\frac{\partial v}{\partial z}+\frac{\partial w}{\partial y})\) |
| B. | \(\tau_{yz}=μ(\frac{\partial u}{\partial z}+\frac{\partial u}{\partial y})\) |
| C. | \(\tau_{yz}=μ(\frac{\partial v}{\partial x}+\frac{\partial w}{\partial x})\) |
| D. | \(\tau_{yz}=μ(\frac{\partial w}{\partial z}+\frac{\partial v}{\partial y})\) |
| Answer» B. \(\tau_{yz}=μ(\frac{\partial u}{\partial z}+\frac{\partial u}{\partial y})\) | |
| 3. |
Express the shear stress tensor(τ) 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 (λ) and the dynamic viscosity coefficient (μ)? |
| A. | λ=\(-\frac{2}{3}\) μ |
| B. | λ=\(\frac{2}{3}\) μ |
| C. | λ=\(-\frac{1}{3}\) μ |
| D. | λ=\(-\frac{1}{2}\) μ |
| Answer» B. λ=\(\frac{2}{3}\) μ | |
| 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 the stress tensors from the diagram is represented by Τxy? |
| A. | 3 |
| B. | 2 |
| C. | 1 |
| D. | 4 |
| Answer» B. 2 | |
| 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 | |