| 11. | Thermal diffusivity is given by
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| a. | A |
| b. | B |
| c. | C |
| d. | D |
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Answer: (a).A
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| 12. | At steady state the temperature variation in a plane wall, made of two different solids I & II is shown below. The thermal conductivity of material I
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| a. | is smaller than that of II. |
| b. | is greater than that of II. |
| c. | is equal to that of II. |
| d. | can be greater than or smaller than that of II. |
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Answer: (a).is smaller than that of II.
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| 13. | In case of surface condensers, a straight line is obtained on plotting 1/U vs __________ on an ordinary graph paper.
 |
| a. | A |
| b. | B |
| c. | C |
| d. | D |
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Answer: (a).A
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| 14. | Fouling factor for a heat exchanger is given by (where, U₁ = heat transfer co-efficient of dirty surface U₂ = heat transfer co-efficient of clean surface)
 |
| a. | A |
| b. | B |
| c. | C |
| d. | D |
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Answer: (b).B
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| 15. | For a counter current heat exchanger with Tih = 80°C, T°c = 60°C, T°h = 50°C and Tic = 30°C, and the temperature difference between the two streams being the same everywhere along Z, the direction of flow of hot fluid. The temperature profile should satisfy
 |
| a. | A |
| b. | B |
| c. | C |
| d. | D |
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Answer: (b).B
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