| 46. | The annealing furnace for continuous bar stock is open at the ends and has interior dimensions of 0.6 m * 0.6 m * 1.5 m long with a wall 0.3 m thick all around. Calculate the shape factor for the furnace? |
| a. | 15.24 m |
| b. | 16.34 m |
| c. | 14.54 m |
| d. | 13.76 m |
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Answer: (a).15.24 m
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| 47. | Shape factor for sphere is |
| a. | 4 π r₁ r₂ |
| b. | 4 π r₁ r₂/r₂ – r₁ |
| c. | 4 π /r₂ – r₁ |
| d. | r₁ r₂/r₂ – r₁ |
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Answer: (b).4 π r₁ r₂/r₂ – r₁
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| 48. | Which is true regarding a complete rectangular furnace? |
| a. | 6 walls, 12 edges and 6 corners |
| b. | 0 walls, 2 edges and 4 corners |
| c. | 6 walls, 12 edges and 8 corners |
| d. | 2 walls, 6 edges and 8 corners |
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Answer: (c).6 walls, 12 edges and 8 corners
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| 49. | The shape factor for complete rectangular furnace is
Where a, b and c are the inside dimensions and d x is the wall thickness |
| a. | 2/ d x (a b + b c + c a) + 4 (0.64) (a + b +c) + 8 (0.45) d x |
| b. | 2/ d x (a b + b c + c a) + 4 (0.44) (a + b +c) + 8 (0.35) d x |
| c. | 2/ d x (a b + b c + c a) + 4 (0.34) (a + b +c) + 8 (0.25) d x |
| d. | 2/ d x (a b + b c + c a) + 4 (0.54) (a + b +c) + 8 (0.15) d x |
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Answer: (d).2/ d x (a b + b c + c a) + 4 (0.54) (a + b +c) + 8 (0.15) d x
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| 50. | For the same material and same temperature difference, the heat flow in terms of shape factor is given by |
| a. | S k d t |
| b. | k d t/S |
| c. | 2S k/d t |
| d. | 2S/3 |
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Answer: (a).S k d t
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