In the cement the compound quickest to react with water, is
Tri-calcium aluminate
Tetra-calcium alumino-ferrite
Tri-calcium silicate
Di-calcium silicate
Correct Answer :
A. Tri-calcium aluminate
Related Questions
The variety of pig iron used for the manufacture of steel by Bessemer process, is
Bessemer pig
Grey pig
White forge pig
Mottled pig
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
A pug mill is used for
Softening brick earth
Moulding brick earth
Tempering brick earth
Providing brick earth
Soundness test of cement determines
Quality of free lime
Ultimate strength
Durability
Initial setting
Resins are
Not soluble in water
Soluble in spirit
Used in varnishes
Left behind on evaporation of oil
The rock generally used for roofing, is
Granite
Basalt
Slate
Pumice
Pick up the plutonic rock from the following:
Granite
Dolerite
Basalt
All the above
Seasoning of timber is done
To make it water proof
To paint its surface
To increase its temperature
To remove water
Lime putty
Is made from hydraulic lime
Is made by adding lime to water
Can be used only upto three days
All of above
In brick masonry the bond produced by laying alternate headers and stretchers in each course is known as
English bond
Double Flemish bond
Zigzag bond
Single Flemish bond
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
Non acid-resistant asbestos is:
Tremolite asbestos
Chrysotile asbestos
Amosite asbestos
None 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
Portland cement manufactured from pure white chalk and clay but free from iron-oxide, is known as
Quick setting cement
Rapid hardening cement
White cement
Low heat Portland cement
The cement becomes unsound by the presence of excess
Sulphur
Magnesia
Lime
All of these
The process of decarbonising the pig iron completely and then adding proper percentage of carbon for manufacturing steel, is called
Cementation process
Crucible process
Bessemer process
Open hearth process
The cast iron when heated to red heat with powdered red haematite in an oven for increasing its toughness, is converted to
Grey cast iron
White cast iron
Mottled cast iron
Toughed cast iron
The steel used for the manufacture of rails, is
Bessemer steel
Mild steel
Cast steel
Stainless steel
For a good building stone, its specific gravity should the greater than
1.5
1.7
2.2
2.7
Proper amount of entrained air in concrete results in (i) Better workability (ii) Better resistance to freezing and thawing (iii) Lesser workability (iv) Less resistance to freezing and thawing The correct answer is
(i) and (ii)
(i) and (iv)
(ii) and (iii)
(iii) and (iv)
Snowcrete is one of the patent forms of
Distempers
Water proof cement paints
Enamel paints
Cellulose paints
The presence of original rounded surface on the manufactured piece of timber, is called
Wane
Torn grain
Diagonal grain
Chipmark
Ultimate strength to cement is provided by
Tri-calcium silicate
Di-calcium silicate
Tri-calcium aluminate
Tetra calcium alumino ferrite
The most durable varnish is
Water varnish
Spirit varnish
Turpentine varnish
Oil varnish
Knots in timber are
Defects caused by crushing fibres
Splits radiating from the centre
Speckled strains
Signs of branches cut off
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
A good quality stone absorbs water less than
5 %
10 %
15 %
25 %
Pick up the incorrect statement from the following:
Plastics are chemical resistant
Plastics are durable
Plastics are ductile
Plastics are excellent electric insulators
The lime which contains high percentage of calcium oxide, is generally called
Fat lime
Rich lime
White lime
None of these
For lime concrete,
Slump is 50 to 75 mm
Flexural strength at 90 days is 0.2 N/mm2
Compressive strength at 90 days is 1.5 N/mm2
All the above