IRP f2w
- Pick out the incorrect statement regarding stiffness of wood
(a) Denser wood are more stiff
(b) Green timber is more stiff than when seasoned
(c) Structural sizes of timber are more stiff than the clear small sticks
(d) Wood is not a stiff material - By reducing moisture content of timber above fibre saturation points which one of the
following is not correct?
(a) Tensile strength is increased
(b) Compressive strength is increased
(c) Stiffness is increased
(d) Shear strength is increased - Hard boards are example of
(a) plywood (b) fibre board (c) particle board (d) chip board - As a construction material, plywood is preferred to thin planks of timber because of
(a) good strength and dimensional stability in both lateral and longitudinal directions
(b) good dimensional stability in both longitudinal and lateral directions
(c) good strength in both longitudinal and lateral directions
(d) savings in cost and environmental considerations. - Plywood is specified by
(a) weight (b) volume (c) thickness (d) number of layers - Plywood has great stifness and strength
(a) across the grains (b) along the grains
(c) both (a) and (b) (d) tangential to the grain - The expansion and shrinkage of plywoods are comparatively very low as
(a) they are held in poisition by adhesives
(b) they are glued under pressure
(c) plies are places at right angles to each other
(d) they are prepared from veneers - Timber can be made fire resistant by
(a) dipping and steeping process (b) sir Abel's process
(c) charring (d) hot and cold open tank treatment - Consider the following methods of preservation of timber
- Dipping 2. Brushing or spraying
- Pressure impregnation
The correct sequence in decreasing order of the effectiveness of these methods of
preservation is
(a) 1, 2, 3 (b) 2, 1, 3 (c) 3, 1, 2 (d) 3, 2, 1
- The wood preservative "Creosote" is derived from
(a) wood or coal (b) acidic cupric chromate
(c) chromated zinc chloride (d) pentachlorophenol - During the conversion of timber by sawing, in order to obtain strong timber pieces, the
cuts should be made by
(a) ordinary sawing (b) tangential sawing
(c) quarter sawing (d) radial sawing