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Cup is a defect in timber, indicated by
- a)The curvature formed in the direction of length of timber
- b)The curvature formed in the transverse direction of the timber
- c)Uneven shrinkage
- d)A crack which separates fibres of wood
Correct answer is option 'B'. Can you explain this answer?
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Cup is a defect in timber, indicated bya)The curvature formed in the d...
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Cup is a defect in timber, indicated bya)The curvature formed in the d...
Cup is a defect in timber, indicated by the curvature formed in the transverse direction of the timber.
Explanation:
When timber is cut from a tree, it undergoes various changes due to moisture content and drying. Cup is a common defect that occurs in timber, and it is indicated by the curvature formed in the transverse direction of the timber. Here's an explanation of why option B is the correct answer:
Curvature formed in the transverse direction:
When timber dries, it tends to shrink more along the radial direction (from the center to the outer edge) compared to the tangential direction (along the growth rings). This differential shrinkage causes the timber to develop a curvature or cup shape. The concave side of the cup is towards the pith (center) of the tree, and the convex side is towards the bark.
Other options:
Let's briefly discuss why the other options are not the correct answers:
a) The curvature formed in the direction of length of timber: This is not the correct answer because cupping occurs in the transverse direction, not along the length of the timber. The curvature formed in the length direction is known as bow.
c) Uneven shrinkage: This option is not the correct answer because uneven shrinkage is a general term and does not specifically indicate cupping in timber.
d) A crack which separates fibers of wood: This option is not the correct answer because a crack that separates fibers of wood is known as a split or check, not cupping.
Conclusion:
In conclusion, cup is a defect in timber that is indicated by the curvature formed in the transverse direction of the timber. This defect occurs due to differential shrinkage along the radial and tangential directions during the drying process. It is important to consider cupping when using timber in construction to ensure its structural integrity and prevent potential issues.
Explanation:
When timber is cut from a tree, it undergoes various changes due to moisture content and drying. Cup is a common defect that occurs in timber, and it is indicated by the curvature formed in the transverse direction of the timber. Here's an explanation of why option B is the correct answer:
Curvature formed in the transverse direction:
When timber dries, it tends to shrink more along the radial direction (from the center to the outer edge) compared to the tangential direction (along the growth rings). This differential shrinkage causes the timber to develop a curvature or cup shape. The concave side of the cup is towards the pith (center) of the tree, and the convex side is towards the bark.
Other options:
Let's briefly discuss why the other options are not the correct answers:
a) The curvature formed in the direction of length of timber: This is not the correct answer because cupping occurs in the transverse direction, not along the length of the timber. The curvature formed in the length direction is known as bow.
c) Uneven shrinkage: This option is not the correct answer because uneven shrinkage is a general term and does not specifically indicate cupping in timber.
d) A crack which separates fibers of wood: This option is not the correct answer because a crack that separates fibers of wood is known as a split or check, not cupping.
Conclusion:
In conclusion, cup is a defect in timber that is indicated by the curvature formed in the transverse direction of the timber. This defect occurs due to differential shrinkage along the radial and tangential directions during the drying process. It is important to consider cupping when using timber in construction to ensure its structural integrity and prevent potential issues.
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Cup is a defect in timber, indicated bya)The curvature formed in the direction of length of timberb)The curvature formed in the transverse direction of the timberc)Uneven shrinkaged)A crack which separates fibres of woodCorrect answer is option 'B'. Can you explain this answer?
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Solutions for Cup is a defect in timber, indicated bya)The curvature formed in the direction of length of timberb)The curvature formed in the transverse direction of the timberc)Uneven shrinkaged)A crack which separates fibres of woodCorrect answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for Civil Engineering (CE).
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