Building Materials, Third Edition
222
IQU
- Discuss briefly the following:
(a) Effects of moisture on mechanical properties of wood.
(b) Effect of temperature on strength of wood.
(c) Fire resistance of timber.
- Describe the physical and mechanical properties of timber.
- Suggest suitable timber for the following purposes. Give also the reasons for your choice.
(a) Doors (b) Railway sleepers
(c) Piles (d) Scaffolding
(e) Shuttering (f) Pegs
(g) Purlins (h) Well curb
(i) Furniture (j) Agricultural equipments
(k) Packing boxes
- Write short notes on the following:
(a) AsCu Treatment (d) Lamin board
(b) Plywood (e) Chip board
(c) Hard board (f) Batten board
- (a) Describe the various processes of application of preservatives.
(b) Define seasoning of timber. How is seasoning done on large scale?
(c) Why is it necessary to provide odd number of veneers in a plywood?
- (a) What is plywood and where is it used with advantage? State its uses in modern
buildings.
(b) What are the principal categories in which the trees can be classified? Give two examples
of each of them along with their users as building material.
- Describe the chief characteristics and uses of the following in the construction industry:
(a) Sheeshum (d) Bamboo
(b) Teak (e) Sal
(c) Deodar (f) Plywood
- Differentiate between:
(a) Exogenous and endogenous trees
(b) Star shake and heart shake
(c) Natural and artificial seasonings
(d) Lamin board and batten board
- What are the various tests performed to test the suitability of timber? Describe in detail
the tests performed to determine moisture content of timber.
- Describe the following tests for timber:
(a) Compressive strength (c) Cleavability
(b) Impact strength (d) Tensile strength
- (a) Explain the damage caused by insects to wood.
(b) Why is preservative treatment necessary for timber?
(c) Describe briefly the application of preservatives to increase the fire resistance of wood.
- (a) What are the advantages of wood based products?
(b) Explain the different ways of classification of timber.
(c) Explain the different methods of veneering.
