| 41. | The following data pertains to a hollow cylinder and a hollow sphere made of same material and having the same temperature drop over the wall thickness
Inside radius = 0.1 m and outside surface area = 1 square meter If the outside radius for both the geometrics is same, calculate the ratio of heat flow in the cylinder to that of sphere? |
| a. | 0.056 |
| b. | 2.345 |
| c. | 1.756 |
| d. | 3.543 |
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Answer: (c).1.756
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| 42. | “All the factors relating to geometry of the sections are grouped together into a multiple constant called the shape factor” True or false |
| a. | True |
| b. | False |
| c. | May be |
| d. | Can't say |
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Answer: (b).False
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| 43. | Shape factor for plane wall is equal to |
| a. | A/δ |
| b. | 2A/δ |
| c. | 3A/δ |
| d. | 4A/δ |
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Answer: (a).A/δ
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| 44. | For a prescribed temperature difference, bodies with the same shape factor will allow heat conduction proportional to |
| a. | k/2 |
| b. | 2k |
| c. | k |
| d. | k/4 |
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Answer: (c).k
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| 45. | Shape factor for cylinder is |
| a. | 6 π l/log e (r₂/r₁) |
| b. | 4 π l/log e (r₂/r₁) |
| c. | π l/log e (r₂/r₁) |
| d. | 2 π l/log e (r₂/r₁) |
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Answer: (d).2 π l/log e (r₂/r₁)
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