IRH f2w
- Which of the following pairs regarding the fefects in timber are correctly matched?
- Upsets Due to over maturity of unventilated storage of wood
- Foxiness Due to crushing of fibres running transversely
- Star shakes Radial splits widest at the circumference and diminishing towards
the centre - Heart shakes Cracks widest at the centre and diminishing towards the outer
circumference
Select the correct answer using the codes given below
(a) 1 and 2 (b) 3 and 4
(c) 1, 3 and 4 (d) 2 and 4
- Which of the following pairs is matched correctly?
(Defect) (Causes)
(a) Heart shake Serve frost and fierce heat by sun
(b) Cup shake Frost action
(c) Star shake Irregular cutting of branch
(d) Upsets Basis of branches burried by cambial
activity of mother branch - Match List-I (Name of defect) with List-II (Definition) and select the correct answer using
the codes given below the list :
List-I List-II
(Name of Defect) (Definition)
A. Cupping 1. Caused by wood limbs encased by wood
of the free trunk
B. Bowing 2. Caused by grain irregularities in the
board and can be eliminated byproper
stacking
C. Chucks 3. Small cracks appearing at the ends of
boards caused by too rapid drying
D. Knots 4. Unequal shrinking in the radial and
tangential direction.
Codes:
(a)ABCD (b)ABCD
1234 4321
(c)ABCD (d)ABCD
1324 4231 - Fire proofing of timber
(a) makes the timber surface fire proof
(b) makes it difficult to ignite and support its own combustion
(c) does not allow the fire come closer to wood
(d) extinguishes the fire and dissipates the heat generated - Which of the following woods is not suitable for making bridge?
(a) Babool (b) Nageshwar (c) Sal (d) Teak