The main constituent which imparts hydraulicity to hydraulic lime is
Calcium oxide
Silica
Clay
Water
Correct Answer :
C. Clay
Related Questions
Which of the following ingredients of the brick earth enables the brick to retain its shape?
Alumina
Silica
Iron
Magnesia
Which of the following timbers is suitable for making sports goods?
Mulberry
Mahogany
Sal
Deodar
For obtaining vinyl chloride acetate, the method used, is
Addition polymerization
Condensation polymerization
Co-polymerization
None of these
A good quality stone absorbs water less than
5 %
10 %
15 %
25 %
The minimum compressive strength of 2nd class bricks should be
75 kg/cm2
90 kg/cm2
100 kg/cm2
120 kg/cm2
In paints, the pigment is responsible for
Durability
Colour
Smoothness
Glassy face
Three basic raw materials which are needed in large quantities for production of steel are
Iron ore, coal and sulphur
Iron ore, carbon and sulphur
Iron ore, coal and lime stone
Iron ore, carbon and lime stone
Bitumen is generally obtained from
Organic material
Synthetic material
Petroleum product
Coal
Red short iron cracks when bent due to the presence of
Sulphur
Carbon
Phosphorus
Silicon
A bull nose brick is not used for
Rounding off sharp corners
Pillars
Decoration purpose
Arches
Which of the following gradients exerts maximum influence on properties of steel?
Iron
Carbon
Manganese
Sulphur
Which of the following sedimentary rocks changes into quartzite by metamorphic action?
Sand stone
Lime stone
Shale
Gypsum
Good quality sand is never obtained from
River
Lake
Sea
Gravel powder
Steel contains carbon approximately
1.50% to 5.6%
0.05% to 1.75%
0.25 %
None to these
The moisture content in a well seasoned timber is
4 % to 6 %
10 % to 12 %
15 % to 20 %
100 %
Pick up the compound responsible for early strength of cement from the following:
Tetra-calcium alumino-ferrite
Tri-calcium silicate
Tri-calcium aluminate
Di-calcium silicate
Expansion Joints in masonry walls are provided in wall lengths usater than
10 m
20 m
30 m
40 m
The type of steel used for precision levelling staff, is
Titanium steel
Carbon steel
Invar
Stainless steel
Quick lime (or caustic lime)
Is obtained by the calcination of pure lime stone
Has great affinity to moisture
Is amorphous
All the above
Varnish is a transparent or semi-transparent solution of resinous substances in
Alcohol
Linseed
Turpentine
All the above
The plastics prepared from Vinyl resin are
Odourless
Non-toxic
Transparent
All of these
Percentage content of silica in window glass, is
40 to 45
50 to 55
60 to 65
70 to 75
Cast steel is manufactured by
Cementation process
Crucible process
Bessemer process
Open hearth process
Jhumb bricks are
Under burnt
Over burnt
Kutcha
None of these
Knots in timber are
Defects caused by crushing fibres
Splits radiating from the centre
Speckled strains
Signs of branches cut off
In stone masonry, if stones are so placed that their layers are parallel to the direction of load, they
Split easily
Are affected by moisture
Both (A) and (B)
None of these
The main constituent of cement which is responsible for initial setting of cement is
Di-calcium silicate
Tri-calcium silicate
Tri-calcium aluminate
All of the above
Whitworth compressed steel is obtained when molten steel is subjected to a pressure of
5 kg/mm2
9 kg/mm2
13 kg/mm2
15 kg/mm2
Rapid hardening cement attains early strength due to
Larger proportion of lime grounded finer than normal cement
Lesser proportion of lime grounded coarser than normal cement
Lesser proportion of lime grounded finer than normal cement
Excess percentage of gypsum
The percentage of alumina and silica in good fire clay vary respectively is
25, 75
30, 70
35, 65
All of these