If the iron ore contains clay as an impurity, the flux added during calcination, is
Clay
Lime stone
Argillaceous iron ore
All the above
Correct Answer :
B. Lime stone
Related Questions
Invar contains
12% of nickel
24% of nickel
30% to nickel
36% of nickel
The curved swellings from the growth of layers or wounds left after branches are cut off in an irregular manner are known as
Knots
Rindgalls
Burls
None of these
In a rock calcium carbonate predominates. State whether it is:
Siliceous rock
Argillaceous rock
Calcareous rock
None of these
The rocks in which argil (or clay) predominates, are called
Siliceous rocks
Argillaceous rocks
Calcareous rocks
Igneous rocks
A rock contains only one mineral. It is called
Homogeneous
Non-homogeneous
Monomineralic
Polymineralic
The rocks formed from molten magma, are called
Sedimentary rocks
Igneous rocks
Metamorphic rocks
None of these
Pick up the correct statement from the following:
In basic Bessemer process, the steel heats the converter
In open-hearth process, the furnace heats the steel
In Siemens process, the impurities of pig iron are oxidised by the oxygen of the ore
All the above
Pick up the non-inflammable plastic from the following:
Cellulose acetate plastics
Polyvinyl chloride plastics
Phenol formaldehyde plastic
Urea formaldehyde plastic
The foliated structure is very common in
Sedimentary rocks
Igneous rocks
Metamorphic rocks
None of these
The variety of pig iron used for manufacture of wrought iron, is
Bessemer pig
Grey or foundry pig
White forge pig
Mottled pig
The size of mould for bricks, is generally kept
A little large to specified size
A little small to specified size
Equal to specified size
10% larger than specified size
Cast iron is used for
Structural works in beams
Small sized water pipes
Columns and struts
None to these
First class timber has an average life of
Less than one year
1 to 5 years
5 to 10 years
More than 10 years
French polish is
Oil paint
Distemper
Spirit varnish
None to these
The most important constituent of varnish, is
Drier
Solvent
Resin
All the above
The frog of the brick in a brick masonry is generally kept on
Bottom face
Top face
Shorter side
Longer side
The colour of statuary marble used for sculptor's work, is
Red
Blue
White
Green
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
Good quality stones must
Be durable
Be free from clay
Resist action of acids
All the above
Ultimate strength to cement is provided by
Tri-calcium silicate
Di-calcium silicate
Tri-calcium aluminate
Tetra calcium alumino ferrite
According to ISI, bitumen is classified into
2 grades
4 grades
8 grades
10 grades
Glazing is used to make earthenware
Hard
Soft
Porous
Impervious
Which of the following is a mineral?
Basalt
Granite
Quartz
Syenite
Seasoning of timber is done
To make it water proof
To paint its surface
To increase its temperature
To remove water
The most commonly used synthetic abrasive is
Aluminium carbide
Boric acid
Silicon
All of these
Sapwood consists of
Innermost annular rings around the pith
Portion of timber between heartwood and cambium layer
Thin layers below the bark
Thin fibre which extends from the pith outwards and holds the annular rings together
Duco paints are
Plastic paints
Cellulose paints
Emulsion paints
Oil paints
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
Lacquer paints
Are generally applied on structural steel
Are less durable as compared to enamel paints
Consist of resin and nitro-cellulose
All the above
The amount of water used for one kg of distemper is
0.2 liter
0.4 liter
0.6 liter
0.8 liter