| 11. | The famous Fourier series is named after |
| a. | Diller and Ryan |
| b. | J.B. Joseph Fourier |
| c. | Stefan- Boltzmann |
| d. | Wein’s |
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Answer: (b).J.B. Joseph Fourier
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| 12. | Fourier law of heat conduction is best represented by |
| a. | Q = -k A d t /d x |
| b. | Q = k A d x/d t |
| c. | Q = -k A |
| d. | Q = k d t/d x |
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Answer: (a).Q = -k A d t /d x
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| 13. | Here are some assumptions that are made for Fourier law. Identify the wrong one |
| a. | No internal heat generation |
| b. | Steady state heat conduction |
| c. | Non- linear temperature profile |
| d. | Isotropic and homogenous material |
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Answer: (c).Non- linear temperature profile
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| 14. | Consider the following statements:
The Fourier heat conduction equation Q = -k A d t /d x Presumes i) Steady state conditions ii) Constant value of thermal conductivity iii) Uniform temperature at the wall surface iv) One dimensional heat flow Which of these statements are correct? |
| a. | 1, 2 and 3 |
| b. | 1, 2 and 4 |
| c. | 2, 3 and 4 |
| d. | 1, 3 and 4 |
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Answer: (d).1, 3 and 4
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| 15. | Negative sign in Fourier heat conduction equation indicates |
| a. | Heat always flow is in the direction of positive temperature gradient |
| b. | Heat always flow in the direction of negative temperature gradient |
| c. | No heat flow is there |
| d. | Data is insufficient |
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Answer: (b).Heat always flow in the direction of negative temperature gradient
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