E-PolyLearning

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

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

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

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

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