21.
If a working drawing is made to a scale of 1 50, a length of 5.5 metres would be shown on the drawing by a length of
A
55 mm
B
110 mm
C
275 mm
D
550 mm
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If a working drawing is made to a scale of 1 50, a length of 5.5 metres would be shown on the drawing by a length of
55 mm
110 mm
275 mm
550 mm
I n order to qualify for the weekly tool allowance, a bricklayer may be expected to provide
bevel, square, dividers, carborundum stone
dividers, square, boat level, jointer
bevel, square, corner blocks, line level
corner blocks, jointer, carborundum stone, square
Honeycombs in sleeper walls
improve speed of construction
increase underfloor warmth
provide underfloor ventilation
reduce the brickwork cost
Having set out a rectangular building, the accurate check for squareness of the corners would be to
use an instrument called a sitesquare
measure each side to confirm the correct dimensions
measure the diagonals
place a builders square against each corner
Hatching is a method which is used to indicate
materials
volume
density
dimensions
Dry rot in timber is the result of
chemical decay
insect attack
old age
fungal attack
Curing of concrete is achieved by providing
cold surface conditions
constant hot air
intermittent surface heat
damp conditions
Coarse aggregate is mainly retained on a sieve of
3 mm
4 mm
5 mm
6 mm
Care should be taken when using a plumb rule during periods of
strong winds
severe frost
patchy fog
prolonged rain
Bricks that are subjected to severe weather conditions should be
permeable
porous
dense
sulphate resisting
Before a foundation may be concreted, the natural foundation must be inspected by the
clerk of works
factory inspector
safety officer
building control officer
Backfilling and compaction of trenches should be carried out in layers of
150 mm
200 mm
300 mm
450 mm
A trench 4.000 m in length, 1.000 m in depth and 1.000 m wide is to be excavated; the sub-soil is clay. The amount to be carted away will be
6.500 m3
4.500 m3
5.00 m3
5.500 m3
A horizontal member used in trench timbering is a
waling board
poling board
foot prop
puncheon
A horizontal d.p.c. is placed to stop moisure
rising up from the ground
running down into the foundations
passing from the outer leaf to the inner leaf
flooding the cavity
A disadvantage with clayey subsoils is that in long periods of dry weather they tend to
lift
shrink
explode
collapse
A d.p.c. placed under a stone sill should extend on each side of the sill at least
75 mm
100 mm
150 mm
200 mm
A d.p.c.
provides a level bed
provides a bed for floor joists
holds back moisture
binds the lower courses together
A building line is
the line in front of which no building is allowed
part of a bricklayers tool kit
the datum line of a building
a line seen through the eyepiece of a surveyors level
A brick scutch should be used to
adjust quoin bricks
cut small bevelled bats
cut perforated bricks
trim rough-cut bricks