The compound of Portland cement which contributes to the strength after two to three years is
Tri-calcium silicate
Di-calcium silicate
Tri-calcium aluminate
Tetra-calcium alumino ferrite
Correct Answer :
B. Di-calcium silicate
Related Questions
Pick up the correct statement from the following:
Rust is due to formation of oxides
Cast iron oxidises less
Steel oxidises most
All the above
The pressure acting on the stones in stone masonry construction should be
Along the direction of bedding planes
At 45° to the direction of bedding planes
At 60° to the direction of bedding planes
Perpendicular to the direction of bedding planes
A queen closer is a
Brick laid with its length parallel to the face or direction of wall
Brick laid with its breadth parallel to the face or direction of wall
Brick having the same length and depth as the other bricks but half the breadth
Brick with half the width at one end and full width at the other
If the furnace is provided with insufficient fuel at low temperatures, the type of pig iron produced, is called
Bessemer pig
Grey or foundry pig
White or forge pig
Mottled pig
PVC stands for
Plastic very compact
Polythene vinyl chloride
Polythene vinyl carbon
Polythene vanadium carbide
Expanded metal is
Manufactured from steel sheets
Used for reinforced concrete in road pavements
Measured in term of SWM (short way mesh) and LWM (long way mesh)
All the above
Which of the following trees yields hard wood?
Deodar
Chir
Shishum
Pine
The basic purpose of a retarder in concrete is
To increase the initial setting time of cement paste in concrete
To decrease the initial setting time of cement paste in concrete
To render the concrete more water tight
To improve the workability of concrete mix
Pick up the correct statement from the following:
Steel produced by open hearth process is milder than that obtained by the Bessemer process
Engineers prefer open hearth steel for structural purpose as it is more homogenous
Basic Bessemer process is suitable for converting poor ore containing a large proportion of sulphur and phosphorus into steel
All the above
The type of steel used for precision levelling staff, is
Titanium steel
Carbon steel
Invar
Stainless steel
Sand stone is
Sedimentary rock
Metamorphic rock
Igneous rock
Volcanic rock
Pick up the correct statement from the following:
Soft stones are required for carving
Light stones are required for arches
Hard stones are required to stand high pressure
All the above
Good quality stones must
Be durable
Be free from clay
Resist action of acids
All the above
Second class bricks
Are of dark brown colour
Produce a metallic sound when struck
Are well burnt
Are under burnt
The PVC doors and windows are preferred as they are
Rust proof
Rot proof
Water proof
All of these
The compound of Portland cement which contributes to the strength after two to three years is
Tri-calcium silicate
Di-calcium silicate
Tri-calcium aluminate
Tetra-calcium alumino ferrite
Resins are
Not soluble in water
Soluble in spirit
Used in varnishes
Left behind on evaporation of oil
Plywood is made by bonding together thin layers of wood in such a way that the angle between grains of any layer to grains of adjacent layers is
0°
30°
45°
90°
Clay and silt content in a good brick earth must be at least
50 %
40 %
30 %
25 %
Based on the following rocks and minerals, select the correct statement, quartz, shale, basalt, granite, marble, gypsum, mica
Basalt and marble are the only metamorphic rocks
There is no sedimentary rock
Granite is the only igneous rock
Quartz and mica are minerals
The main constituent of fly-ash, is
Aluminium oxide
Silica
Ferrous oxide
All of these
Sea sand used in structures causes
Dampness
Efflorescence
Disintegration
All of these
Elastomers can extend upto
Five times their original dimensions
Seven times their original dimensions
Ten times their original dimensions
Three times their original dimensions
Expansion Joints in masonry walls are provided in wall lengths usater than
10 m
20 m
30 m
40 m
Name the type of cement from the following for canal linings:
Sulphate resisting cement
Rapid hardening cement
Quick setting cement
Pozzolana cement
The compound of Portland cement which reacts immediately with water and also sets first is
Tri-calcium silicate
Di-calcium silicate
Tri-calcium aluminate
Tetra calcium alumino ferrite
The main function of alumina in brick earth is
To impart plasticity
To make the brick durable
To prevent shrinkage
To make the brick impermeable
The yield strength and tensile strength of low carbon steel may be improved by the addition of
Manganese
Chromium
Nickel
Vanadium
Calcination of iron ores is done
To remove moisture
To remove carbonic acid
By roasting in heaps
All the above
Which of the following timbers is suitable for making sports goods?
Mulberry
Mahogany
Sal
Deodar