Which of the following pairs gives a correct combination of the useful and harmful constituents respectively of a good brick earth?
Lime stone and alumina
Silica and alkalies
Alumina and iron
Alkalies and magnesium
Correct Answer :
B. Silica and alkalies
Related Questions
Polymerization helps to improve the property of
Strength
Rigidity
Elasticity
All of these
Cast iron contains carbon approximately
1.5% to 5.5%
0.05% to 1.75%
0.250 %
None to these
For obtaining vinyl chloride acetate, the method used, is
Addition polymerization
Condensation polymerization
Co-polymerization
None of these
Early attainment of strength in rapid hardening cement is mainly due to
Gypsum
Finer grinding
Tri-calcium silicate
Tri-calcium aluminate
The clay to be used for manufacturing bricks for a large project, is dugout and allowed to weather throughout
The monsoon
The winter
The summer
None of these
Asbestos is
Corrugated sheet used for roofing
An incombustible fire proof material
An organic substance
All the above
The lime which contains high percentage of calcium oxide, is generally called
Fat lime
Rich lime
White lime
None of these
Which one of the following is an air binding material?
Gypsum
Acid-resistant cement
Quick lime
All of these
The low voltage porcelain is mainly used for
Switch block
Insulating tubes
Lamp sockets
All of these
The tendency of a stone is, to split along:
Texture
Fracture
Cleavage
Structure
Pick up the polymineralic rock from the following:
Quartz sand
Pure gypsum
Magnesite
Granite
Linseed oil is used in paints as
Thinner
Vehicle
Base
Drier
Initial setting time of cement for asbestos cement products should be not less than
30 minutes
50 minutes
75 minutes
90 minutes
Ultimate strength to cement is provided by
Tri-calcium silicate
Di-calcium silicate
Tri-calcium aluminate
Tetra calcium alumino ferrite
The main ingredients of Portland cement are
Lime and silica
Lime and alumina
Silica and alumina
Lime and iron
Galvanising means covering iron with a thin coat of
Tin
Zinc
Glaze
Coal tar
Jumper is a tool used for
Testing of stones
Quarrying of stones
Dressing of stones
None of the above
The variety of pig iron used for the manufacture of steel by Bessemer process, is
Bessemer pig
Grey pig
White forge pig
Mottled pig
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
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 constituent of cement which is responsible for all the undesirable properties of cement is
Di-calcium silicate
Tri-calcium silicate
Tri-calcium aluminate
Tetra calcium alumino ferrite
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
Addition of pozzolana to ordinary Portland cement increases
Bleeding
Shrinkage
Permeability
Heat of hydration
Laterite is a/an
Volcanic rock
Argillaceous rock
Calcareous rock
Siliceous rock
The specific gravity of marble, is
2.50
2.60
2.66
2.72
Brass is an alloy of
Copper and zinc
Zinc and lead
Tin and silver
Zinc and nickel
Sand stone is
Sedimentary rock
Metamorphic rock
Igneous rock
Volcanic rock
Bitumen emulsion is
A liquid containing bitumen in suspension
A paint
Used as anti-corrosive paint
All the above
Wrought iron contains carbon upto
0.25 %
1.0 %
1.5 %
2 %
Fibre boards can be
Distempered
Painted
Painted and distempered
Used for furniture