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WorksheetsDay 93-Dec 31-worksheet-Diploma-Timber part 3
Total questions: 15
Worksheet time: 11mins
Veneers used in plywood manufacturing are usually arranged in odd numbers because
It reduces cost
It increases thickness uniformly
It ensures balanced strength and avoids warping
It improves surface finish
According to IS 399, a timber having an average life of 75 months when buried half-length in soil is classified as
High durability
Moderate durability
Low durability
Perishable
The specific gravity range of Compreg timber is
0.60 – 0.75
0.85 – 1.00
1.30 – 1.35
Above 1.50
Which timber defect is identified by reddish or yellow coloration caused by poor ventilation during storage?
Callus
Shakes
Foxiness
Burls
The IS code for preservation of timber is
IS 1141
IS 1708
IS 6534
IS 401
The moisture content recommended for timber used in building frames is approximately
2–5 %
8–12 %
12–18 %
Above 20 %
In timber, maximum strength is obtained when load acts
Perpendicular to grain
Inclined at 45° to grain
SECTION B – True/False: Compreg timber is cured under pressure and is stronger than impreg timber. Choose the correct option.
True
False
SECTION B – True/False: Fibre boards are manufactured using wood pulp with thickness generally more than 25 mm. Choose the correct option.
True
False
The thin sheets of timber having thickness from ____ mm to ____ mm are called veneers.
(a)
The total thickness of a standard batten board is (a) mm.
————-are also known as pressed wood or reconstructed wood.
(a)
In IS 3629, Group A timber has modulus of elasticity greater than (a) kN/mm².
Timber having availability more than (a) m³ per year falls under X-class as per IS 399.
The outer annual rings between heartwood and cambium layer are known as (a) .
