Which one of the following is acid resistant asbestos?
Actinolite asbestos
Amosite asbestos
Anthophylite asbestos
All the above
Correct Answer :
D. All the above
Related Questions
Bitumen emulsion is
A liquid containing bitumen in suspension
A paint
Used as anti-corrosive paint
All the above
In arches, stratified stones are placed so that their planes are
Parallel
Perpendicular
Radial
None of these
A 1st class brick immersed in water for 24 hours, should not absorb water (by weight) more than
10 %
15 %
20 %
25 %
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
Calcination of iron ores is done
To remove moisture
To remove carbonic acid
By roasting in heaps
All the above
Pick up the rock which is not a sedimentary rock from the following:
Gravel
Sand stone
Gypsum
Dolerite
Pick up the correct statement from the following:
Lime is available in Free State
Lime is available by dissolving calcium carbonate in water
Lime is available by calcining calcium carbonate at 900°C
Lime is nothing but calcium chloride
Which of the following ingredients of the brick earth enables the brick to retain its shape?
Alumina
Silica
Iron
Magnesia
The steel which contains fissures and cavities, is manufactured by
Cementation process
Crucible process
Bessemer process
Open hearth process
Apiece of sawn timber whose cross-sectional dimensions exceed 5 cm, in one direction and 20 cm in the other direction, is called a
Cant
Deal
Baulk
Strip
According to IS 399-1963, the weight of the timber is specified at
8% moisture content
10% moisture content
12% moisture content
14% moisture content
Duco is one of the patent forms of
Emulsion paints
Plastic paints
Bituminous paints
Cellulose paints
Pick up the correct statement from the following:
The percentage of absorption for firebricks varies from 5 to 10
The percentage of silica in silica bricks is to the extent of about 95 to 97 percent
Roughly 1 to 2 percent of lime in silica bricks is added to act as binding material
All the above
Rocks formed due to alteration of original structure due to heat and excessive pressure are called
Sedimentary rocks
Igneous rocks
Metamorphic rocks
None of these
Wrought iron contains carbon about
1.5% to 5.5%
0.5% to 1.75%
0.1% to 0.25%
None to these
Based on its dry weight, a freshly felled tree may contain water
25 %
50 %
75 %
100 %
For sanitary pipes and chemical stonewares,
Salt glazing is used
Lead glazing is used
Opaque glazing is used
None of these
Fibre boards can be
Distempered
Painted
Painted and distempered
Used for furniture
The rocks in which argil (or clay) predominates, are called
Siliceous rocks
Argillaceous rocks
Calcareous rocks
Igneous rocks
Pick up the correct statement from the following:
Steel produced by open hearth process is milder than that obtained by the Bessemer process
Engineers prefer open hearth steel for structural purpose as it is more homogenous
Basic Bessemer process is suitable for converting poor ore containing a large proportion of sulphur and phosphorus into steel
All the above
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
The percentage of alumina in a good brick earth lies between
5 to 10 %
20 to 30 %
50 to 60 %
70 to 80 %
Assertion A : Pure lime takes a long time to develop adequate strength. Reason R : Pure lime has slow hardening characteristics. Select your answer according to the coding system given below:
Both A and R is true and R is correct explanation of A
Both A and R is true and R is not a correct explanation of A
A is true but R is false
A is false but R is true
The main function of alumina in brick earth is
To impart plasticity
To make the brick durable
To prevent shrinkage
To make the brick impermeable
Pick up the correct statement from the following:
In stone arches, the stones are placed with their natural beds radial
In cornices, the stones are placed with their natural beds as vertical
In stone walls, the stones are placed with their natural beds as horizontal
All the above
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
Bessemer process is used for the manufacture of
Pig iron
Cast iron
Wrought iron
Steel
The material generally not used as extender in paints, is
Powdered silica
Gypsum
Talc
Zinc white
Glazing is used to make earthenware
Hard
Soft
Porous
Impervious
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