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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