Cast steel is manufactured by
Cementation process
Crucible process
Bessemer process
Open hearth process
Correct Answer :
B. Crucible process
Related Questions
For construction of structures under water, the type of lime used, is
Hydraulic lime
Fat lime
Quick lime
Pure lime
Knots in timber are
Defects caused by crushing fibres
Splits radiating from the centre
Speckled strains
Signs of branches cut off
The weight of 1 m3 of brick earth, is about
1200 kg
1500 kg
1800 kg
2000 kg
The filler used in plastic bitumen, is
Shale powder
Talc powder
Asbestos powder
Plastic powder
The main constituent of fly-ash, is
Aluminium oxide
Silica
Ferrous oxide
All of these
The proportions of lime and sand in the mortar normally used in brick construction are
1 : 2
1 : 4
1 : 6
1 : 8
French polish is
Oil paint
Distemper
Spirit varnish
None to these
Pig iron obtained from the furnace which is properly provided with fuel at a very high temperature, is called
Bessemer pig
Grey or foundry pig
White or forge pig
Mottled pig
The most common admixture which is used to accelerate the initial set of concrete is
Gypsum
Calcium chloride
Calcium carbonate
None of 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 nominal size of the modular brick is
190 mm × 90 mm × 80 mm
190 mm × 190 mm × 90 mm
200 mm × 100 mm × 100 mm
200 mm × 200 mm × 100 mm
Slate is formed by metamorphic action on
Shale
Lime stone
Sand stone
Granite
For obtaining vinyl chloride acetate, the method used, is
Addition polymerization
Condensation polymerization
Co-polymerization
None of these
In order of increasing percentage of silica, the correct sequence is
Sandy clay, calcareous clay, pure clay
Calcareous clay, pure clay, sandy clay
Pure clay, sandy clay, calcareous clay
None of these
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
Pick up the correct statement from the following:
Adding 5% to 6% of moisture content by weight, increases the volume of dry sand from 18% to 38%
The bulking of fine sand is more than that of coarse sand
If the percentage content of moisture exceeds 10%, increase in bulk of sand starts increasing
All the above
Crushing strength of a good building stone should be more than
50 MPa
100 MPa
150 MPa
200 MPa
Cast iron contains carbon approximately
1.5% to 5.5%
0.05% to 1.75%
0.250 %
None to these
Pick up the correct statement from the following:
Roasting is not necessary if iron ore is an oxide
Impurities float on the molten iron as slag
The slag contains lime about 45%
All the above
The practical limit of moisture content achieved in air drying of timber is
5 %
15 %
25 %
35 %
Oil varnish generally consists of
Synthetic resin and spirit
Oil, wax and resin
Resin, oil and turpentine
Spirit, oil and wax
Crushing strength of a first class brick should not be less than
3.5 N/mm²
7.0 N/mm²
10.5 N/mm²
14.0 N/mm²
Teak wood is suitable for
Sports articles
Furnitures
Railway sleepers
All the above
The softest rock is
Marble
Diamond
Talc
Quartz
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
Pick up the metal refractory from the following:
Molybdenum
Tungsten
Zirconium
All of these
Bitumen paints offer
Pleasing surface
Hard surface
Smooth surface
Protective surface
To retard the initial setting time of cement, the compound responsible, is
Tri-calcium silicate
Gypsum
Di-calcium silicate
Tri-calcium aluminate
The wedging is adopted for quarrying costly stratified rock such as
Laterite
Marble
Limestone
All the above
Assertion A : Paints with white lead base are not recommended for painting of iron works. Reason R : Paints with white lead base do not check rusting of iron. Select your answer according to the coding system given below:
Both A and R is true and, R is the correct explanation of A
Both A and R is true but R is not the correct explanation of A
A is true but R is false
A is false but R is true