Good quality cement contains higher percentage of
Tri-calcium silicate
Di-calcium silicate
Tri-calcium aluminate
Tetra calcium alumino ferrite
Correct Answer :
A. Tri-calcium silicate
Related Questions
Pick up the correct statement from the following:
Melamine is obtained from calcium carbide
Formaldehyde is prepared synthetically from methane
The melamine when reacted with formaldehyde forms the melamineformaldehyde resin
All the above
A piece of timber whose thickness and width are respectively 5 cm and 10 cm is called
Slate
Plank
Board
Strip
The plywood
Has good strength along the panel only
Can be spilt in the plane of the panel
Has greater impact resistance to blows than ordinary wood
Cannot be bent more easily than ordinary wood of same thickness
The rocks which are formed due to cooling of magma at a considerable depth from earth's surface are called
Plutonic rocks
Hypabyssal rocks
Volcanic rocks
Igneous rocks
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
Forge pig may be converted to wrought iron by
Rolling
Pudding
Shingling
Refining
The stones obtained by blasting are used as
Ballast in railways
Aggregates for concrete
Road metal
All the above
A bull nose brick is not used for
Rounding off sharp corners
Pillars
Decoration purpose
Arches
Which of the following trees yields hard wood?
Deodar
Chir
Shishum
Pine
The fire clay contains pure
Lime
Oxide of iron
Hydrated aluminium silicate
Magnesium
Chlorite, a green colour mineral is mainly derived from the decomposition of
Augite
Biotite
Hornblende
All of these
If the iron ore contains clay as an impurity, the flux added during calcination, is
Clay
Lime stone
Argillaceous iron ore
All the above
As per IS specifications, the maximum final setting time for ordinary Portland cement should be
30 minutes
1 hour
6 hours
10 hours
The cement becomes unsound by the presence of excess
Sulphur
Magnesia
Lime
All of these
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
The main ingredients of Portland cement are
Lime and silica
Lime and alumina
Silica and alumina
Lime and iron
The low voltage porcelain is mainly used for
Switch block
Insulating tubes
Lamp sockets
All of these
Addition of pozzolana to ordinary Portland cement increases
Bleeding
Shrinkage
Permeability
Heat of hydration
The most valuable timber may be obtained from
Chir
Shishum
Sal
Teak
The colour of statuary marble used for sculptor's work, is
Red
Blue
White
Green
Pug mill is used for
Preparation of clay
Moulding of clay
Drying of bricks
Burning of bricks
Softer variety of steel may be obtained by
Cementation process
Crucible process
Bessemer process
Open hearth process
Seasoning of timber is done for
Increasing moisture content
Decreasing moisture content
Increasing strength of timber
None to these
Resins are
Not soluble in water
Soluble in spirit
Used in varnishes
Left behind on evaporation of oil
Putty is
Made with finely powdered chalk and linseed oil
Used for fixing glass panes
Softened by a solution of pearl ash and quick-lime soaked in water
All the above
Mastic asphalt is
Acid resisting material
Non-corrosive material
Corrosive material
Heating-resisting material
Elastomers can extend upto
Five times their original dimensions
Seven times their original dimensions
Ten times their original dimensions
Three times their original dimensions
The property by virtue of which lime sets under water, is known as
Slacking
Setting
Hydraulicity
Calcining
Pick up the correct statement from the following:
Solder material is an alloy which melts at a temperature above 400°C
Brazing is done at temperature above 600°C to 1100°C
Brazing joint is stronger than the solder joint
All the above
The proportions of charcoal, saltpetre and sulphur in gun powder by weight, are respectively:
15, 75, 10
75, 10, 15
10, 15, 75
10, 75, 15