Building Material Flashcards
Lacquer paints
A. are generally applied on structural steel
B. are less durable as compared to enamel paints
C. consist of resin and nitro-cellulose
D. contain alcohol as thinner
carbon contents of cast iron, wrought iron and steel
cast iron = 4 %
mild steel =0.25%
steel = 0.25~1.5 %
wrought iron = <0.15%
The initial setting time of lime-pozzolana, is
120 min
final setting = 24~48 hrs
High alumina cement:
Initial setting time= 3.5 hours.
Final setting time= 5 hours.
initial and final setting time of different type of cement
Initial setting time of OPC 30minutes final 10 hours.
Initial setting time of quick setting cement minutes.
Final setting time of quick setting cement is 30 minutes.
Initial setting time of high alumina cement is 3.5 hours.
Final setting time of high alumina cement is 5 hours.
The rocks which are formed due to cooling of magma at a considerable depth from earth’s surface are called
plutonic rock
Igneous rock may form with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.
Rocks form at moderate depth - hypabyssal eg. Dolerite.
At top of earth surface - volcanic eg. Basalt.
igneous rock classification on depth
Plutonic > 35m eg granite.
Hypabyssal < 35m eg dolerite.
Volcanic on Earth surface eg basalt.
All 3 are the examples of igneous rock.
Brittleness of cold is due to an excess of
DBT means ductile to brittle transition.
Phosphorus causes a DBT when the temp drops below some critical temp (which is known as cold brittleness or shortness because brittleness is caused due to lowering of temperature).
Sulphur causes a DBT when the temp rises above some critical temp (which is known as hot shortness because brittleness is caused at high temp).
Cold brittleness needs to be avoided because otherwise, steel will become brittle in winters.
Gneiss
Gneiss is a high-grade metamorphic rock, meaning that it has been subjected to higher temperatures and pressures than schist. It is formed by the metamorphosis of granite, or sedimentary rock. Gneiss displays distinct foliation, representing alternating layers composed of different minerals.
Fibre glass
[A]. retains heat-longer
[B]. has a higher strength to weight ratio
[C]. is shock proof and fire retardent
[D]. does not decay
the variety of pig iron used for the manufacture of steel
Bessemer - steel.
Grey pig - cast iron.
White forge pig - wrought iron.
Crucible process
The process of manufacturing steel by heating short lengths of wrought iron bars mixed with charcoal in fire clay crucibles and collecting the molten iron into moulds, is known as Crucible process
specific gravity of quartz and calcite
For quartz = 2.65.
For calcite = 2.72.
Apiece of sawn timber whose cross-sectional dimensions exceed 5 cm, in one direction and 20 cm in the other direction, is called a
[A]. cant
[B]. deal
[C]. baulk @
[D]. strip.
Baulk is generally known as log.
When thickness 5cm more & width 20cm more this called Baulk (log). !
Quick lime (or caustic lime)
[A]. is obtained by the calcination of pure lime stone
[B]. has great affinity to moisture
[C]. is amorphous
[D]. All the above. @
Quick lime (or caustic lime)
[A]. is obtained by the calcination of pure lime stone
[B]. has great affinity to moisture
[C]. is amorphous
[D]. All the above. @
Pick up the correct statement from the following:
[A]. soft stones are required for carving
[B]. light stones are required for arches
[C]. hard stones are required to stand high pressure
[D]. All the above. @
Soft stone is used for carving because carving is done better in losse packed stone.
Name the type of cement from the following for canal linings :
[A]. sulphate resisting cement @
[B]. rapid hardening cement
[C]. quick setting cement
[D]. pozzuolana cement.
Sulphate Resisting Portland Cement is correct Ans.
In this cement, the percentage of Tricalcium aluminate is kept below 5% and its results in the increase in resisting powder against sulphates. It is used for structures which are likely to be damaged by severe alkaline conditions such as canal linings, culverts etc.
Black marble is generally found in the district of
[A]. Jodhpur [B]. Jaipur @ [C]. Jabalpur [D]. Jaisalmer [E]. Pune.
Generally, white marble is found in Jabalpur district (M.P) & Black marble in Jaipur.
The most fire resistant paints are :
[A]. enamel paints
[B]. aluminium paints
[C]. asbestos paints @
[D]. cement paints
Most outstanding advantages of aluminum paint.
Aluminum paint has a quick drying process and offers good quality aluminum paint price ratio. It presents a great capacity coating is especially suitable as thermal insulation and is considered a type of highly corrosion resistant paint.
Asbestos Paint.
The natural fire-resistant property of asbestos makes it ideal for roofing, flooring, and thermal insulation. Since a home needs to be fire resistant, many prefer using asbestos. The asbestos material doesn’t burn, so placing asbestos near electrical components are advised.
If P is the percentage of water required for normal consistency, water to be added for determination of initial setting time, is
[A]. 0.70 P [B]. 0.75 P [C]. 0.80 P [D]. 0.85 P @ [E]. 0.90 P.
Why used in cement setting time mould 85 percent water addition & Le chart. 78 percent.
A good brick earth should contain :
[A]. about 20% to 30% of alumina [B]. about 50% to 60% of silica [C]. not more than 5% of lime [D]. about 5 to 6% of oxide of lime [E]. All the above.
Fat lime is also known as high calcium lime or pure lime or rich lime or white lime. It is popularly known as fat lime as it slakes vigorously and its volume is increased to about 2 to 2.5 times that of quick lime. This lime is used for various purposes as whitewashing, plastering of walls, as lime mortar with sand for pointing in masonry work, as a lime mortar with turki for thick masonry walls, foundations, etc.
Shingle is
[A]. decomposed laterite @
[B]. crushed granite
[C]. water bound pebbles
[D]. air weathered rock.
Shingle - water-bound pebbles.
Moorum - Decomposed laterite.
Rhyolite - Crushed Granite.
The lime which contains mainly calcium oxide and slacks with water, is
[A]. fat lime [B]. quick lime @ [C]. hydraulic lime [D]. poor lime [E]. none of these.
Quicklime is correct.
Types of quicklime (CaO+impurities in the form of clay etc)-
- Rich lime/fat lime/white lime- The quicklime in which 95% to 100% pure lime (CaO), 0-5% impurity.
- Hydraulic lime- The quicklime in which 70 to 95% pure lime (CaO), 5-30% impurity.
- Poor lime/Lean lime- the quicklime in which up to 70% (CaO), more than 30% impurity.
Inhaling of fly-ash over a long period causes
[A]. silicosis [B]. fibrosis of lungs [C]. bronchitis [D]. pneumonitis [E]. All of these. @
Inhaling of fly-ash over a long period causes
[A]. silicosis [B]. fibrosis of lungs [C]. bronchitis [D]. pneumonitis [E]. All of these. @
Minimum required water cement ratio for a workable concrete, is
[A]. 0.30 [B]. 0.40 @ [C]. 0.50 [D]. 0.60 [E]. 1.0.
In concrete, for chemical reaction 0.23% water content is require. and 0.15% water content require for evaportion loss. 0.23 + 0.15 = 0.38.
But on-site for convenience, we take 0.38 as 0.40
Pick up the correct statement from the following: Method of sawing timber
[A]. tangentially to annual rings, is known as tangential method.
[B]. in four quarters such that each board cuts annual rings at angles not less than 45°, is known as quarter sawing method.
[C]. cut out of quarter logs, parallel to the medullary rays and perpendicular to annual rings, is known as radial sawing.
[D]. all the above. @
Ordinary Sawing.
It is the most economical, cheapest and is widely used method of sawing. In it only long parallel planks are cut. Because the inner portion is heartwood which is hard and outer portion is sapwood which is soft thus after dryness there will be unequal shrinkage, thus the planks are liable to wrap and twist.
In Quarter sawing, the logs are cut or sawn in a quarter and is then cut in such a way so as to bend in a transverse direction. This method is adopted when no distinct medullary rays are present and gives very fine figure wood.
In this method, logs are sawn parallel to modular rays and perpendicular to annual rings. This method gives the least shrinkage but most wasteful. This method gives most decorative works in which medullary rays are marked, and least shrinkage is because of the property of medullary rays to resist shrinkage.
Tangential Sawing.
If annual rings are well formed and medullary rays are not well formed than tangential sawing is used. In this method, cuts are made tangent to the annual rings. Planks obtained by this method wraps too much and must not be used for costly works. Such planks are not suitable for flooring.
Clay and silt content in a good brick earth must be at least
[A]. 50% @ [B]. 40% [C]. 30% [D]. 25% [E]. 20%.
Clay and silt content in a good brick earth must be at least
[A]. 50% @ [B]. 40% [C]. 30% [D]. 25% [E]. 20%.
Bessemer process is used for the manufacture of
[A]. Pig iron
[B]. cast iron
[C]. Wrought iron
[D]. Steel. @
Bessemer process is used for the manufacture of
[A]. Pig iron
[B]. cast iron
[C]. Wrought iron
[D]. Steel. @
The portion of the brick without a triangular corner equal to half the width and half the length, is called
[A]. closer
[B]. queen closer
[C]. king closer @
[D]. squint brick.
Given answer is correct.
Brick without a triangular corner equal to half of its length and half of its width is KING CLOSER.
If it is only half of its width cut along full lenght then it QUEEN CLOSER.
A good quality stone absorbs water less than
[A]. 5% @ [B]. 10% [C]. 15% [D]. 20% [E]. 25%.
A good quality stone absorbs water less than
[A]. 5% @ [B]. 10% [C]. 15% [D]. 20% [E]. 25%.
The rocks in which argil (or clay) predominates, are called
[A]. sillicious rocks
[B]. argillaceous rocks @
[C]. calcareous rocks
[D]. igneous rocks.
Siliceous, argillaceous, calcareous are all Sedimentary Rock.
Siliceous rocks are sedimentary rocks that have silica (SiO2) as the principal constituent.
Argillaceous components are fine-grained (less than 2 µm) CLAY minerals such as kaolinite.
Calcareous is partly composed of calcium carbonate, in other words, containing lime or being chalky.
Inner part of a timber log surrounding the pitch, is called
[A]. sapwood
[B]. cambium layer
[C]. heart wood @
[D]. none to these.
PHSCB from innermost to outermost,
- Pitch
- Heartwood
- Sap wood
- cambium
- Bark
Resins are
[A]. not soluble in water [B]. soluble in spirit [C]. used in varnishes [D]. left behind on evaporation of oil [E]. all the above. @
Resins are
[A]. not soluble in water [B]. soluble in spirit [C]. used in varnishes [D]. left behind on evaporation of oil [E]. all the above. @
Expanded metal is
[A]. manufactured from steel sheets
[B]. used for reinforced concrete in road pavements
[C]. measured in term of SWM (shortway mesh) and LWM (long way mesh)
[D]. all the above. @
Expanded metal is a form of metal stock made by shearing a metal plate in a press, so that the metal stretches, leaving diamond-shaped voids surrounded by interlinked bars of the metal.
EXAMPLE-
Grates : in outdoor furniture (e.g. benches).
fencing : installation of “heating floor” system;.
plastering (metal lath).
The rock generally used for roofing, is
[A]. granite
[B]. basalt
[C]. slate @
[D]. pumice.
Slate can be made into roofing slates, which are installed by a Slater. And, are a type of roof shingle, or more specifically a type of roof tile. Slate has two lines of break ability “Cleavage and grain” which make it possible to split the stone into thin sheets. When broken, slate retains a natural appearance while remaining relatively flat and easy to stack.
The commonly used drying oil for oil paints, is
[A]. olive oil
[B]. linseed oil
[C]. kerosine oil
[D]. accetate of lead. @
Drying oil is a kind of vegetable oil which drys in normal temperature. Linseed oil, Poppy oil, Walnut oil, Sunflower oil and Safflower oil are known as typical drying oil. Acetate of lead is a drying agent.
Some drying oils are Linseed oil, Poppy seed oil, Walnut oil, tung oil. Here the qb is “commonly used drying oil for oil paints” so the answer is LINSEED OIL.
The foliated structure is very common in
[A]. sedimentary rocks
[B]. igneous rocks
[C]. metamorphic rocks @
[D]. none of these.
Except for marble and quartzite only.
All general metamorphic rocks are foliated rocks.
Foliation in geology refers to repetitive layering in metamorphic rocks. Each layer can be as thin as a sheet of paper, or over a meter in thickness. The word comes from the Latin folium, meaning “leaf”, and refers to the sheet-like planar structure.
Wrought iron is manufactured from pig iron by
[A]. refining [B]. pudding [C]. shingling [D]. rolling [E]. all the above. @
The puddling furnace is a metal making technology used to create wrought iron or steel from the pig iron produced in a blast furnace.
Refining-it one type of iron making process.
Shingling was a stage in the production of bar iron or steel.
Rolling is a metal forming process in which metal stock is passed through one or more pairs of rolls to reduce the thickness and to make the thickness uniform.
Pick up the correct statement from the following:
[A]. The phenol is carbolic acid
[B]. The phenol is either extracted from coal-tar or prepared from benzene
[C]. Phenol reacts with formaldehyde, to form phenol formaldehyde resin
[D]. The plastics prepared from phenol-formaldehyde are used for paints, varnishes, w.c. seats
[E]. All the above. @
Pick up the correct statement from the following:
[A]. The phenol is carbolic acid
[B]. The phenol is either extracted from coal-tar or prepared from benzene
[C]. Phenol reacts with formaldehyde, to form phenol formaldehyde resin
[D]. The plastics prepared from phenol-formaldehyde are used for paints, varnishes, w.c. seats
[E]. All the above. @
Pick up the correct statement from the following:
[A]. Catalysts are added to assist and accelerate the hardening of resin,
[B]. The fillers are inert materials and they impart strength and hardness
[C]. Fibrous fillers increase thermal resistance
[D]. All the above. @
Pick up the correct statement from the following:
[A]. Catalysts are added to assist and accelerate the hardening of resin,
[B]. The fillers are inert materials and they impart strength and hardness
[C]. Fibrous fillers increase thermal resistance
[D]. All the above. @
Wrought iron is used for
[A]. structural works in beams
[B]. small sized water pipes @
[C]. columns and struts
[D]. none to these.
Wrought iron is an iron alloy with a very low carbon (less than 0.08%) content in contrast to cast iron (2.1% to 4%). It is a semi-fused mass of iron with fibrous slag inclusions (up to 2% by weight), which gives it a “grain” resembling wood that is visible when it is etched or bent to the point of failure.
The timber having maximum resistance against white ants, is obtained from
[A]. chir
[B]. shisham
[C]. sal @
[D]. teak.
Answer is wrong. Teak is the right answer. Because its smell of this tree is not favorable to white ants or termites. Another example for such a tree is sal.
Knots in timber are
[A]. defects caused by crushing fibres
[B]. splits radiating from the centre
[C]. speckled strains
[D]. signs of branches cut off. @
Knot- it shows the root branches which are broken or cut of the tree.
Shakes- It is the result of rupture of tissues causing partial or complete separation of the along grain.
Heat shake- it occurs due to shrinkage of the inner part of the trunk. They start from the heart, extend in a redial direction perpendicular to the annual rings.
Star shake- these are redial cracks start from the park and extend towards inner portion.
Cup shake or ring shake- they are curved cracks parallel to annual rings.
Lime concrete is generally used for
[A]. wall foundations
[B]. flooring at ground level @
[C]. both (a) and (b)
[D]. neither (a) nor (b).
Lime concrete is very widely used for foundation bases of load bearing walls, columns, and under layers of floors. So, C is correct.
Stuco paints are suitable for
[A]. stone masonry
[B]. brick walls
[C]. both (a) and (b) @
[D]. neither (a) nor (b).
Stucco or render is a material made of aggregates, a binder, and water. Stucco is applied wet and hardens to a very dense solid. It is used as decorative coating for walls and ceilings and as a sculptural and artistic material in architecture.
Stucco may be used to cover less visually appealing construction materials such as metal, concrete, cinder block, or clay brick and adobe.
Duco is one of the patent forms of
[A]. emulsion paints [B]. plastic paints [C]. bituminous paints [D]. aluminium paints [E]. cellulose paints. @
Duco is one of the patent form of cellulose paint available in the market.
The normal curing period for lime mortar, is:
[A]. one day [B]. 3 days [C]. 7 days @ [D]. 10 days [E]. 14 days.
The normal curing period for lime mortar, is:
[A]. one day [B]. 3 days [C]. 7 days @ [D]. 10 days [E]. 14 days.
The type of steel used for precision levelling staff, is
[A]. Titanium steel
[B]. Carbon steel
[C]. Invar @
[D]. Stainless steel.
Invar has less expasion property due to change in temperature.
During pudding
[A]. molten metal is kept clear of the fuel
[B]. carbon is converted into carbonic acid gas
[C]. silicon forms a slag
[D]. metal is heated by the burning of gases
[E]. all the above. @
During pudding
[A]. molten metal is kept clear of the fuel
[B]. carbon is converted into carbonic acid gas
[C]. silicon forms a slag
[D]. metal is heated by the burning of gases
[E]. all the above. @
German silver is an alloy of
[A]. zinc, lead and nickel [B]. silver, gold and lead [C]. copper, nickel and zinc @ [D]. copper, brass and zinc [E]. brass, silver and zinc.German silver is an alloy of
German silver is an alloy of
[A]. zinc, lead and nickel [B]. silver, gold and lead [C]. copper, nickel and zinc @ [D]. copper, brass and zinc [E]. brass, silver and zinc.
Quartzite, a metamorphic stone is
[A]. hard [B]. brittle [C]. crystalline [D]. compact [E]. All the above. @
Quartzite, a metamorphic stone is
[A]. hard [B]. brittle [C]. crystalline [D]. compact [E]. All the above. @
Pick up the correct statement from the following:
[A]. Plastics have generally low melting point
[B]. The coefficient of thermal expansion of plastics is about three times than that of steel
[C]. The acoustical boards prepared by impregnating fibre-glass with phenolic resins has absorption coefficient of about 0.67
[D]. All the above. @
Pick up the correct statement from the following:
[A]. Plastics have generally low melting point
[B]. The coefficient of thermal expansion of plastics is about three times than that of steel
[C]. The acoustical boards prepared by impregnating fibre-glass with phenolic resins has absorption coefficient of about 0.67
[D]. All the above. @
Dextrin is
[A]. animal glue [B]. starch glue [C]. albumin glue [D]. rubber based adhesive @ [E]. none to these.
Dextrin, along with all dietary fibers, may aid in reducing the glycemic load of a meal containing carbohydrates.
Although fiber is a carbohydrate, it is not digested and does not raise blood sugar or insulin. Water-soluble fiber, like dextrin, displays the most beneficial effect on glucose levels.
The right answer is B starch glue as dextrin is formed by heating starch.
For the manufacture of stainless steel, steel is mixed with
[A]. chromium @
[B]. nickel
[C]. tungsten
[D]. none of these.
Chromium in steel is 11% and Nickel is 8%.
Pick up the correct statement from the following:
[A]. Quick lime is obtained by burning pure lime stone:
[B]. Hydraulic lime is obtained by burning lime stone containing clay 5% to 30%
[C]. Poor lime is obtained by burning lime stone containing impurities more than 5%
[D]. All the above. @
Option C should be more than 30% instead of more than 5%.
Smith’s test of stones is performed to find out
[A]. the presence of soluble matter of stone @
[B]. the compressive strength of the stone
[C]. the hardness of the stone
[D]. the toughness of the stone.
Tests on stone (Strength and Durability Tests).
Acid test (presence of calcium carbonate in building stone. If the edges are broken and powder is formed on the surface, it indicates the presence of calcium carbonate.
Attrition test ( (his test is done to find out the rate of wear of stones, which are used in road construction. The results of the test indicate the resisting power of stones against the grinding action under traffic. ).
Crushing test. Crystalline test (Crystallization of CaSO4 in pores of stone causes decay of stone due to weathering).
Freezing and thawing test.
Hardness Test (Coefficient of hardness = 20 “ (Loss of weight in gm/3).
Impact test (For determining the toughness of stone, it is subjected to impact test in a Page Impact Test Machine).
Smith’s Test (Presence of earthy matter will convert the clear water into dirty water. If water remains clear, stone will be durable and free from any soluble matter).
The process of decarbonising the pig iron completely and then adding proper percentage of carbon for manufacturing steel, is called
[A]. Cementation process @
[B]. crucible process
[C]. Bessemer process
[D]. Open hearth process.
In cementation process, the pig iron is converted to almost pure wrought iron and then preparing steel by adjusting carbon content.
The Bessemer process was the first inexpensive industrial process for the mass production of steel from molten pig iron before the development of the open hearth furnace. The key principle is removal of impurities from the iron by oxidation with air being blown through the molten iron. The oxidation also raises the temperature of the iron mass and keeps it molten.
Open hearth furnaces are one of a number of kinds of furnace where excess carbon and other impurities are burnt out of pig iron to produce steel. Since steel is difficult to manufacture due to its high melting point, normal fuels and furnaces were insufficient and the open hearth furnace was developed to overcome this difficulty. Compared to Bessemer steel, which it displaced, its main advantages were that it did not expose the steel to excessive nitrogen (which would cause the steel to become brittle), was easier to control, and it permitted the melting and refining of large amounts of scrap iron and steel.
The operation of removal of impurities or clay adhering to iron ores, is known as
[A]. dressing @
[B]. calcination
[C]. roasting
[D]. smelting.
The operation of removal of impurities or clay adhering to iron ores, is known as
[A]. dressing @
[B]. calcination
[C]. roasting
[D]. smelting.
Dry rot
[A]. cracks the timber [B]. reduces the strength of timber [C]. reduces the timber to powder @ [D]. shrinks the timber [E]. spoils the appearance of timber.
Dry rot
[A]. cracks the timber [B]. reduces the strength of timber [C]. reduces the timber to powder @ [D]. shrinks the timber [E]. spoils the appearance of timber.
Which one of the following polymers is obtained from condensation polymerization ?
[A]. phenol formaldehyde
[B]. carbamide
[C]. melamine-formaldehyde
[D]. all of these. @
Which one of the following polymers is obtained from condensation polymerization ?
[A]. phenol formaldehyde
[B]. carbamide
[C]. melamine-formaldehyde
[D]. all of these. @
The weight of 1 m3 of brick earth, is about
[A]. 1200 kg
[B]. 1500 kg
[C]. 1800 kg @
[D]. 2000 kg.
The weight of 1 m3 of brick earth, is about
[A]. 1200 kg
[B]. 1500 kg
[C]. 1800 kg @
[D]. 2000 kg.
Cement paints usually
[A]. contain hydrated lime [B]. contain 5% to 10% colour pigments [C]. are prepared with white cement [D]. contain 5% sodium chloride [E]. all the above. @
Cement paints usually
[A]. contain hydrated lime [B]. contain 5% to 10% colour pigments [C]. are prepared with white cement [D]. contain 5% sodium chloride [E]. all the above. @
The cement becomes unsound by the presence of excess
[A]. sulphur
[B]. magnesia
[C]. lime
[D]. All of these. @
Soundness due to the lime is measured in Le-Chaltier’s apparatus.
Soundness due to magnesia is measured in auto clave test.
Soundness due to sulphur can’t be measure.
The kiln which may work throughout the year, is
[A]. Clamp
[B]. Bull’s kiln
[C]. Hoffman’s kiln @
[D]. none of these.
The kiln which may work throughout the year, is
[A]. Clamp
[B]. Bull’s kiln
[C]. Hoffman’s kiln @
[D]. none of these.
The steel which contains fissures and cavities, is manufactured by
[A]. Cementation process @
[B]. Crucible process
[C]. Bessemer process
[D]. Open hearth process.
The steel which contains fissures and cavities, is manufactured by
[A]. Cementation process @
[B]. Crucible process
[C]. Bessemer process
[D]. Open hearth process.
Pick up the volcanic rock from the following:
[A]. Granite
[B]. Dolerite
[C]. Basalt @
[D]. All the above.
Volcanic - Basalt and trap.
Hypabyssal - Dolerute apite and dolomite.
Plutoic - Granite synite periodolite.
In stone masonry, stones (stratified rocks) are so placed that the direction of pressure to the plane of bedding is
[A]. right angles @ [B]. 45° [C]. 60° [D]. parallel [E]. None of these.
Stratified rocks are weaker when we put force parallel to the stratified layer of rocks it makes the rock break in parallel layer, however when we apply force perpendicular to the stratified layer of rock, it dose not break because it has numerous thin layer in that direction.
Stratified means naturally combination of parallel sheet of rocks due to metamorphic action, however we usually avoid stratified rocks for load bearing structure, instead we use non stratified rocks for load bearing structure.
Softer variety of steel may be obtained by
[A]. Cementation process
[B]. crucible process
[C]. Bessemer process @
[D]. Open hearth process.
Softer variety of steel may be obtained by
[A]. Cementation process
[B]. crucible process
[C]. Bessemer process @
[D]. Open hearth process.
Calcination of iron ores is done
[A]. to remove moisture [B]. to remove carbonic acid [C]. by roasting in heaps [D]. after dressing [E]. all the above. @
Calcination of iron ores is done
[A]. to remove moisture [B]. to remove carbonic acid [C]. by roasting in heaps [D]. after dressing [E]. all the above. @
The cast iron when heated to red heat with powdered red haemetite in an oven for increasing its toughness, is converted to
[A]. grey cast iron
[B]. white cast iron
[C]. mottled cast iron @
[D]. toughed cast iron.
The cast iron when heated to red heat with powdered red haemetite in an oven for increasing its toughness, is converted to
[A]. grey cast iron
[B]. white cast iron
[C]. mottled cast iron @
[D]. toughed cast iron.
Jhuma bricks are
[A]. under burnt
[B]. over burnt @
[C]. kutcha
[D]. none of these.
Jhuma bricks are
[A]. under burnt
[B]. over burnt @
[C]. kutcha
[D]. none of these.
Plastic bitumen is generally used for
[A]. road pavements
[B]. expansion joints
[C]. crack fillings @
[D]. none to these.
Plastic bitumen is generally used for
[A]. road pavements
[B]. expansion joints
[C]. crack fillings @
[D]. none to these.
Plastic bitumen is generally used for
[A]. road pavements
[B]. expansion joints
[C]. crack fillings @
[D]. none to these.
Plastic bitumen is used for making Road Pavements.
It makes it water-resistant thereby increasing its life.
Cast iron
[A]. is obtained by purifying pig iron [B]. is manufactured in required shapes [C]. may contain 2 to 5 per cent of carbon with other impurities [D]. is remelted in a cupola furnace [E]. all the above. @
Cast iron
[A]. is obtained by purifying pig iron [B]. is manufactured in required shapes [C]. may contain 2 to 5 per cent of carbon with other impurities [D]. is remelted in a cupola furnace [E]. all the above. @
Pick up the correct statement from the following:
[A]. Steel produced by open hearth process is milder than that obtained by the bessemer process
[B]. Engineers prefer open hearth steel for structural purpose as it is more homogenous
[C]. Basic Bessemer process is suitable for converting poor ore containing a large proportion of sulphur and phosphorus into steel
[D]. all the above. @
Pick up the correct statement from the following:
[A]. Steel produced by open hearth process is milder than that obtained by the bessemer process
[B]. Engineers prefer open hearth steel for structural purpose as it is more homogenous
[C]. Basic Bessemer process is suitable for converting poor ore containing a large proportion of sulphur and phosphorus into steel
[D]. all the above. @
