Quiz - Convection | ANSYS Innovation Courses

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Question 1 of 13

1. Question
Convection cannot occur in:
- 1. Solids
- 2. Gases and Liquids
- 3. Fluids
- 4. None of the above
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Question 2 of 13

2. Question
Which of the following statement is correct?
- 1. Diffusion and advection cannot occur simultaneously
- 2. Diffusion of mass is caused by heat gradient
- 3. Diffusion of heat is caused by concentration gradient
- 4. None of the above 
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Question 3 of 13

3. Question
Which of following has the same principle of heat conduction?
- 1. Advection
- 2. Diffusion of mass
- 3. Diffusion of heat
- 4. Natural convection
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Question 4 of 13

4. Question
Which of following statement is correct about natural and forced convection?
- 1. Usually engineers don’t need to consider natural convection as it occurs naturally.
- 2. Usually forced convection is more efficient than natural convection in heat transfer.
- 3. Forced convection and natural convection cannot exist at the same time.
- 4. Forced convection is only used for dissipation of heat, not to increase of temperature.
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Question 5 of 13

5. Question
When solving the heat transfer simulation by conduction-based solver, which of the following statement is correct?
- 1. The governing equation of fluid dynamics is solved.
- 2. Convection flow (the direction of convection) can be obtained.
- 3. Conduction-based solver is considered as more accurate than fluid dynamics solver.
- 4. Convection is simulated as a boundary condition with two parameters: film coefficient and bulk temperature.
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Question 6 of 13

6. Question
Film coefficient can be affected by:
- 1. Viscosity of the fluid
- 2. Velocity of the fluid
- 3. Temperature of the fluid
- 4. All of the above
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Question 7 of 13

7. Question
Film coefficient may be obtained by:
- 1. Analytical solution for some simple cases
- 2. Carefully designed experiments
- 3. Numerical solution from a CFD analysis
- 4. All of the above
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Question 8 of 13

8. Question
Which of the following statement of bulk temperature is incorrect?
- 1. Bulk temperature represents the average temperate of the fluid.
- 2. Bulk temperature can be higher or lower than the surface temperature.
- 3. Bulk temperature is always a fixed value inputted by engineers.
- 4. None of the above.
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Question 9 of 13

9. Question
Which of the following statements about film coefficient is true?
- 1. For natural convection, film coefficient for water is higher than air
- 2. It can be thought of as the heat flux needed to cause a unit difference in temperature in a unit volume
- 3. It has the same unit as thermal conductivity
- 4. It is an important input in a CFD analysis
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Question 10 of 13

10. Question
To use thermal-flow fluid line element, which of the parameter should be known?
- 1. The speed of the fluid flow
- 2. The inlet fluid temperature
- 3. Convection film coefficient between the surface and the fluid
- 4. All of the above
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Question 11 of 13

11. Question
For the gingerbread homework problem, by which method, the gingerbread can be cooled down faster?
- 1. Put the gingerbread in the fridge
- 2. Put the gingerbread in room temperature and use a fan to blow on it
- 3. The two methods use the same time to cool down the gingerbread
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Question 12 of 13

12. Question
For the water-cooled heat sink homework problem, which statement is true?
- 1. Thermal fluid line element is an accurate way to calculate the fluid temperature but adds significant computational cost
- 2. With the water cooling, no more convection boundary condition is needed on the fin surfaces since they are negligible
- 3. The underlining body of the heat sink should be explicitly modeled
- 4. None of the above
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Question 13 of 13

13. Question
For the water-cooled heat sink homework, what’s the difference of maximum temperature on the heat sink between the model with water cooling and without water cooling?
- 1. Around 58 degree Celsius
- 2. Around 25 degree Celsius
- 3. Around 12 degree Celsius
- 4. Same maximum temperature for the two models
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Quiz - Convection

Quiz - Convection

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