| 16. | Following number is called the __________ number.
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| a. | Peclet |
| b. | Stanton |
| c. | Graetz |
| d. | none of these |
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Answer: (c).Graetz
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| 17. | What is the logarithmic mean of r1 and r2 ?
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| a. | A |
| b. | B |
| c. | C |
| d. | D |
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Answer: (a).A
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| 18. | The following equation is the __________ analogy.
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| a. | Colburn |
| b. | Reynolds |
| c. | Prandtl |
| d. | None of these |
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Answer: (a).Colburn
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| 19. | The number given below is termed as the __________ number.
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| a. | Grashoff |
| b. | Nusselt |
| c. | Prandtl |
| d. | Stanton |
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Answer: (c).Prandtl
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| 20. | Heat transfer co-efficient (h) for a fluid flowing inside a clean pipe is given by following equation. This is valid for the value of NRe equal to
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| a. | < 2100 |
| b. | 2100-4000 |
| c. | > 4000 |
| d. | > 10000 |
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Answer: (d).> 10000
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