During smelting process, the combination of fuel in the furnace
Forms carbon dioxide
Carbon dioxide with carbon forms carbon mono-oxide
Carbon mono-oxide reacts with Fe2O3 to form iron and liberates CO2
All the above
Correct Answer :
D. All the above
Related Questions
Pick up correct statement from the following:
Fibre boards are used for thermal and acoustic control
Fibre boards are used for light weight standing members
Fibre boards are obtained by impregnating a resin product on fibres
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
Lime stone is not a
Sedimentary rock
Stratified rock
Aqueous rock
Metamorphic rock
Pick up the correct statement from the following:
Blistering may be cured by applying water paint finished with oil paint dried with a little copal varnish
Cracked paints may be cured by removing paint and giving a fresh coat of paint
Crawling paints may be cured by sand preparing the surface and giving a fresh coat with plenty of turps
All the above
Inner part of a timber log surrounding the pitch, is called
Sapwood
Cambium layer
Heart wood
None to these
Stones used for rubble masonry must be
Soft
Hard
Light
Heavy
Formula for quick lime, is
CaCO3
Ca(OH)2
CO3CO2
None to these
The filler used in plastic bitumen, is
Shale powder
Talc powder
Asbestos powder
Plastic powder
Bitumen is generally obtained from
Organic material
Synthetic material
Petroleum product
Coal
Most commonly used solvent in oil paints, is
Petroleum
Spirit
Coal tar
Turpentine
A heavy stone is suitable for
Arches
Rubble masonry
Roads
Retaining walls
The most commonly used synthetic abrasive is
Aluminium carbide
Boric acid
Silicon
All of these
The percentage of water for normal consistency, is
5% to 15%
10% to 25%
15% to 25%
20% to 30%
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
Slate is formed by metamorphic action on
Shale
Lime stone
Sand stone
Granite
During pudding
Molten metal is kept clear of the fuel
Carbon is converted into carbonic acid gas
Silicon forms a slag
All the above
The type of bond provided in brick masonry for carrying heavy loads is
Single Flemish bond
Double Flemish bond
English bond
Zigzag bond
A rock contains only one mineral. It is called
Homogeneous
Non-homogeneous
Monomineralic
Polymineralic
Portland pozzolana cement possesses
Higher resistance to chemical attack
Lower heat of hydration
Lower shrinkage on drying
All the above
First class timber has an average life of
Less than one year
1 to 5 years
5 to 10 years
More than 10 years
A 1st class brick immersed in water for 24 hours, should not absorb water (by weight) more than
10 %
15 %
20 %
25 %
Seasoning of timber is done for
Increasing moisture content
Decreasing moisture content
Increasing strength of timber
None to these
The foliated structure is very common in
Sedimentary rocks
Igneous rocks
Metamorphic rocks
None of these
Plastic asphalt is
Used as a water proofing layer over roof
A mixture of cement and asphalt
A natural asphalt
A refinery product
A ferrous metal is
Cast iron
Wrought iron
Steel
All the above
Which of the following metamorphic rocks has the most weather resisting characteristics?
Marble
Quartzite
Slate
Lime stone
Good quality cement contains higher percentage of
Tri-calcium silicate
Di-calcium silicate
Tri-calcium aluminate
Tetra calcium alumino ferrite
Seasoning is
A process of removing sap
Creosoting
Painting with sodium silicate
Coating with tar
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:
The heating of a material to redness in contact with air, is known as calcination
The property of lime by which it sets or hardens in damp places having no free circulation of air is called setting
The product that remains after calcination of limestone, is called lime
All the above