Quiz - Thermal Conductivity Copy Copy - ANSYS Innovation Courses

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Question 1 of 12

1. Question
Why is there a sudden temperature drop across two sides of a thermal contact?
- 1. Due to different values of thermal conductivity of the two surfaces in contact
- 2. Due to imperfect contact between the two surfaces
- 3. Due to microscopic pockets of fluid trapped between the two surfaces.
- 4. Both 2 & 3
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Question 2 of 12

2. Question
During conduction in a body which of the following phenomenon is seen?
- 1. Molecules vibrate at their position and collide with each other
- 2. Molecules are displaced completely from their position
- 3. Molecules remain at their place
- 4. both 1 & 2
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Question 3 of 12

3. Question
Which of the following factors do not affect thermal contact conductance?
- 1. Surface roughness
- 2. Thermal conductivity of the contacting surfaces
- 3. Interface temperature
- 4. Contact pressure
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Question 4 of 12

4. Question
Which of the following effect will be seen for a heat flux passing through a good conductor of heat?
- 1. Low temperature gradient
- 2. High temperature gradient
- 3. Same temperature gradient as poor conductor of heat
- 4. None of the above
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Question 5 of 12

5. Question
Increasing the contact pressure on two rough, contacting surfaces of ductile materials;
- 1. Increases the thermal contact resistance due to increase in contact area
- 2. May increase or decrease the thermal contact resistance depending on the bulk conductivity of the materials in contact
- 3. Does not change the thermal contact resistance in any way
- 4. Decreases the thermal contact resistance due to increase in contact area
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Question 6 of 12

6. Question
Which of the following indicates steady state?
- 1. Same thermal gradient with time
- 2. No change in heat flux with time
- 3. Both 1 & 2
- 4. None of the above
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Question 7 of 12

7. Question
Specifying no boundary condition on a surface in a thermal analysis indicates that the surface;
- 1. Is Adiabatic/ perfectly insulated the naturally occurring condition in thermal analyses
- 2. Can absorb the heat
- 3. Will have constant temperature
- 4. None of the above
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Question 8 of 12

8. Question
Consider a cube of length 2 m, composed of copper whose thermal conductivity decreases with an increase in temperature. In case 1, the temperature of two opposing faces is 300 K and 350 K. In case 2, the temperature of the same two opposing faces is 400 K and 450 K. Which of the following statements is true?
- 1. Heat flux is the same in both cases since temperature gradient remains unchanged
- 2. Heat flux in case 2 is higher than that in case 1
- 3. Heat flux in case 2 is lower than that in case 1
- 4. No conclusive statement can be made about heat flux in the two cases
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Question 9 of 12

9. Question
At least one type of thermal boundary condition must be present. Otherwise, what is the error message one may see?
- 1. Conflicting DOF
- 2. Insufficiently constrained model, the steady-state temperature will be infinite if only heat is pumped into a system
- 3. Both 1 & 2
- 4. None of the above
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Question 10 of 12

10. Question
Which of the following indicates correct unit of Thermal Conductivity?
- 1. W m-1 K-1
- 2. W m K
- 3. W m-2
- 4. None of the above
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Question 11 of 12

11. Question
Which of the following factors can affect the thermal conductivity?
- 1. Impurities
- 2. Porosity
- 3. Temperature
- 4. All the above
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Question 12 of 12

12. Question
When solving a finite element simulation with temperature-dependent conductivity, which of the following hold(s) true?
- 1. It is a nonlinear problem
- 2. The Newton Raphson method is used to solve it
- 3. Both 1 & 2
- 4. None of the above
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Quiz - Thermal Conductivity Copy Copy

Quiz - Thermal Conductivity Copy Copy

Quiz Summary

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1. Question

Why is there a sudden temperature drop across two sides of a thermal contact?

2. Question

During conduction in a body which of the following phenomenon is seen?

3. Question

Which of the following factors do not affect thermal contact conductance?

4. Question

Which of the following effect will be seen for a heat flux passing through a good conductor of heat?

5. Question

Increasing the contact pressure on two rough, contacting surfaces of ductile materials;

6. Question

Which of the following indicates steady state?

7. Question

Specifying no boundary condition on a surface in a thermal analysis indicates that the surface;

8. Question

9. Question

At least one type of thermal boundary condition must be present. Otherwise, what is the error message one may see?

10. Question

Which of the following indicates correct unit of Thermal Conductivity?

11. Question

Which of the following factors can affect the thermal conductivity?

12. Question

When solving a finite element simulation with temperature-dependent conductivity, which of the following hold(s) true?