WorksheetsDay 92-Dec 30-worksheet-Diploma-Timber part 2
Total questions: 15
Worksheet time: 11mins
Which defect in timber is characterized by the presence of the original rounded surface on the finished timber piece?
Chip mark
Wane
Torn grain
Diagonal grain
In tangential (plain) sawing of timber,
Saw cuts are parallel to medullary rays
Saw cuts are radial
Saw cuts are tangential to annual rings and meet at right angles
Saw cuts are perpendicular to annual rings
Which timber preservative treatment was developed by Forest Research Institute, Dehradun?
Creosote oil treatment
ASCU treatment
Solignum painting
Coal tar treatment
Which defect occurs due to uneven shrinkage during drying, causing the timber surface to sink?
Check
Split
Collapse
Warp
Which sawing method is most economical but leads to warp and twist?
Radial sawing
Quarter sawing
Ordinary (flat) sawing
Rift sawing
Teak and Sal timber are resistant to termite attack.
True
False
Cup shake is a crack extending from the pith to the sapwood along medullary rays.
True
False
Assertion (A): Coal tar treatment is suitable for timber used below ground level. Reason (R): Coal tar emits unpleasant smell and makes timber unsuitable for painting. Choose the correct option.
Both A and R are true and R is the correct explanation
Both A and R are true but R is not the explanation
A is true but R is false
A is false but R is true
Defect in timber caused due to alternate wetting and drying is called ———-
(a)
The defect indicated by a red or yellow tinge around the pith is called ——-
(a)
Cracks extending from bark towards sapwood are called————
(a)
Curvature formed along the length of timber during seasoning is known as ————
(a)
Allowance made for shrinkage, squaring and planing during conversion of timber is which rang in ——— to ———-millimetres?
(a)
Preservation method in which timber is heated in preservative at 85∘ C to 95∘ C is called what treatment?
Hot and cold open tank treatment
Creosoting
Pressure impregnation
Boucherie process
A square piece of timber with side length from 50 mm to 150 mm is known as what?
(a)
