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. |
In the general transport equation, is the flow property. To get the energy equation out of this general equation, which of these variables cannot be used? |
| A. | v |
| B. | T |
| C. | h<sub>0</sub> |
| D. | i |
| Answer» B. T | |
| 2. |
Which of these terms represent the rate of heat addition to the system due to heat transfer? |
| A. | -k gradT |
| B. | k gradT |
| C. | .(k gradT) |
| D. | .(k gradT) |
| Answer» D. .(k gradT) | |
| 3. |
The energy equation should be solved to get this variable of the flow. |
| A. | Velocity |
| B. | Temperature |
| C. | Density |
| D. | Pressure |
| Answer» C. Density | |
| 4. |
The relationship between the rate of heat transfer per unit area ( dot{q}_s )=-(k T). Where, k is a scalar value of thermal conductivity and T is the gradient of temperature. Which of these following is wrong according to the above equation? |
| A. | Heat transfer is different in different directions |
| B. | The rate of heat transfer depends upon the temperature gradient |
| C. | Heat transfer is in the opposite direction of increasing temperature |
| D. | k is the proportionality constant |
| Answer» B. The rate of heat transfer depends upon the temperature gradient | |
| 5. |
The rate of change of energy in a moving model is ( rho frac{De}{Dt} ). In the final equation, this term is reduced to ( frac{ partial( rho e)}{ partial t}+ nabla.( rho e vec{V}) ). Which of these equations is used for this reduction? |
| A. | Equations of state |
| B. | Stress-strain equation |
| C. | Momentum equation |
| D. | Continuity equation |
| Answer» E. | |
| 6. |
To get the energy equation in terms of temperature, this law is used. |
| A. | Newton s third law of motion |
| B. | Zeroth law of thermodynamics |
| C. | Fick s law |
| D. | Fourier s law of heat conduction |
| Answer» E. | |
| 7. |
The rate of heat increase in a system depends on __________ |
| A. | the rate of heat transferred to the system |
| B. | the rate of heat generated by the system |
| C. | neither the rate of heat generated by the system nor the rate of heat transferred to the system |
| D. | both the rate of heat transferred to the system and the rate of heat generated by the system |
| Answer» E. | |
| 8. |
Consider an infinitesimally small fluid element moving along with the flow. Apply the first law of thermodynamics to this model. Which of these statements is correct? |
| A. | The rate of change of the total energy is equal to the rate of heat addition and work extraction |
| B. | The rate of work extraction is equal to the rate of heat addition and the rate of change of the total energy |
| C. | The rate of heat addition is equal to the rate of work extraction and the rate of change of the total energy |
| D. | The rate of change of the total energy is equal to the rate of work extraction |
| Answer» B. The rate of work extraction is equal to the rate of heat addition and the rate of change of the total energy | |
| 9. |
The physical principle behind the energy equation is _____________ |
| A. | Newton s second law of motion |
| B. | Zeroth law of thermodynamics |
| C. | First law of thermodynamics |
| D. | Newton s first law of motion |
| Answer» D. Newton s first law of motion | |