Materials And Construction

Ceramic recuperators are generally made of

'Hypersil' is a __________ steel.

Perspex is nothing but

Phenol is not shipped in

Pick out the wrong statement.

Plastics are

Invar used in thermocouples is an alloy of nickel and

Liquid ammonia is shipped in __________ containers.

Which of the following is not a copper based alloy with nickel?

The presence of impurities in iron

__________ possesses viscoelastic properties.

Fatigue failure of a material results from __________ stress.

__________ is added in stainless steel to prevent inter crystal corrosion.

__________ is never shipped in glass carboys.

Neutraliser tank used for reacting nitric acid with ammonia for the production of ammonium nitrate is made of

Trough of an apron conveyor is made of

Presence of cobalt in steel improves its

Most suitable material of construction for the storage of concentrated nitric acid is

Which of the following pairs of elements may form an alloy?

The damage/deterioration of metals by the __________ action of fluids is called 'erosion'.

Softening of hardned steel is done by its

The crystal structure of most of the common metals is

Presence of nickel in steel improves its

Ceramic materials fabrication can not be done by

Aluminium as a material of construction suffers from the disadvantage of

The largest consumption of zinc for alloys is in the making of

Which of the following is a non-magnetic material?

Which of the following is not a non-ferrous alloy?

Which has the maximum melting point out of the following?

The hardest material just prior to diamond in Mhos scale is

Dip stick used for measuring the level of petro fuels (e.g. petrol, diesel, fuel oil etc.) in the storage tank is usually made of

The process of coating steel sheets by zinc to improve its corrosion resistance is called

The main constituent of carborundum is __________ carbide.

Cast iron vessels are not suitable for the storage of

Wrought iron is having very high

Anodic material used for the cathodic protection of underground buried steel pipeline is

For platinum thermocouples, lead wires are made of

Presence of high phosphorous in cast iron increases its

Which of the following is not shipped in mild steel containers?

The fermentor used for the production of ethyl alcohol from molasses is made of

The heat treatment process to which castings and the steel balls produced by cold heading are subjected is

The behaviour of visco-elastic material is time dependent. This behaviour is commo in __________ materials.

Cast iron compared to steel is better in

H 2 SO 4 (< 50% concentration) is corrosive to

Constantan is an alloy of

Constituents of stellite are

Polythene (low or high density) containers are not corroded by

An alloy of iron containing 4% carbon is called

German silver used for decorative purposes contains maximum percentage of

Zinc is highly __________ at room temperature.

Brine solution is stored/treated in __________ lined vessels/pipes.

High speed cutting tool steels contain about __________ percent of tungsten.

Fermenter used in the production of pen-cillin by deep fermentation proces is a __________ lined steel vessel

Austenitic manganese steel used for making jaws of crushing machines contains about __________ percent manganese.

18-4-1 high speed steel contains 18%, 4% and 1% respectively of

SO 3 is absorbed using H 2 SO 4 in a

How many molecules per unit cell are there in a face centred cubic lettice?

Percentage elongation of a material is a measure of its

Failure of a material is termed as fatigue failure, if it fails below the yield point. The resistance to fatigue failure of a material is measured by the

Addition of lead, sulphur and phosphorus to low carbon steel helps in improving its

Maximum permissible sulphur content in steel is __________ percent.

Carbon content in steel is __________ percent.

Carbon content in plain carbon steel is __________ percent.

Constantan used in thermocouples is an alloy of

__________ does not contain tin as an alloying material.

Which of the following finds the least commercial use?

A hardened steel essentially contains

Diamagnetic materials are magnetised

Ability of a material to absorb energy in deformation in the plastic range is characterised as its

Evaporator used for concentrating tomato juice is made of

Which of the following alloying elements is present in maximum percentage in high speed steel.

Hardest material so far found is

A hardness depth of about 3 mm can be achieved by induction hardness in __________ seconds.

Mild steel storage vessels are suitable for the storage of

In the Contact process of sulphuric acid manufacture, 98% acid cooler is made of

Steel rods are used in reinforced concrete to increase its __________ strength.

Addition of __________ in steel can help in increasing the depth of hardness.

Molten phthalic anhydride is stored in a/an __________ vessel.

Carbon percentage in medium carbon steel is around

Addition of nickel to copper improves its

__________ is not a case hardening process.

Gunmetal and bronze are not corroded by the action of

Glass lined vessels are not used for handling/storing

Pick the odd man out of the following.

For handling sulphuric acid of 95% strength, the suitable material of construction for pipes is

Percentage of silver in German silver is

Sulphuric acid pickling tanks are lined with

__________ iron is produced, when molten pig iron is chilled suddenly.

Which of the following is the hardest?

A metallic alloy in general as compared to their pure metal components is

Thermosetting polymers are

Tin coating is not done by

Tin vessels are corroded by

Most suitable material for high pressure vessel operating at 500 atm. and 500° C is

Titanium metal

Ferric stainless steels compared to austenitic stainless steels

Chlorination of benzene is done to produce benzene hexachloride (a pesticide) in a photochemical reactor lined with

A measure of toughness of a material is its

Which of the following is produced by condensation polymerisation?

Presence of even very minute amount (say 0.1%) of __________ in copper, reduces its electrical conductivity very seriously.

Thermometer bulb & capillary in case of mercury filled pressure spring expansion thermometer is normally made of __________ as mercury does not amalgamate with it.

Dies for wire drawing are generally made of

High resistance electrical heating elements/wire are not made of

The material used in the filament of electric bulbs is

The main purpose of galvanising iron sheets is to

Which of the following metals in not used for coating of the base metal to guard it against corrosion?

__________ is a donor impurity for semi-conductors.

Hydrochloric acid is stored in a __________ steel vessel.

Fatigue strength of a material increases by

Which of the following alloy steels is the most suitable for making gun barrels and projectiles?

Gun metal is an alloy of

Which is the purest form of iron?

High speed steel should have high

High carbon steel contains more than __________ percent carbon.

Which of the following exercises most powerful influence on the mechanical properties of steel?

Hardened steel is softened by

Which of the following has the poorest weldability?

Copper is dissolved from its ore by H 2 SO 4 in a percolation tank made of

Steel will respond to hardening by heat treatment processes, only when the minimum carbon content in it is __________ percent.

Alpha iron is stable __________ °C.

__________ iron is produced, when molten pig iron is allowed to cool gradually.

Which of the following is not a nickel based alloy?

Presence of even 0.005% of __________ in copper makes it highly brittle, rendering it useless for wire-drawing.

Maximum consumption of lead is in the manufacture of

Coke oven walls are lined with __________ bricks.

Babbit metal (used for making bearings) comprises of

The chlorinator used in the manufacture of DDT is made of

Which of the following comprises of hydrocarbons?

Specify the material of construction suitable for handling concentrated HNO 3 at 100°C.

Which of the following is not an alloy of copper?

Softness of silver can be converted into hardness by alloying it with small quantity of

Tempering of steel is done to make it

Galvanising (i.e., zinc coating) of steel sheets is done to

Nickel is a constituent of

Which of the following heat treatment processes is used for softening the hardened material?

Stainless steel is not corroded by

Which of the following stainless steels is non-magnetic?

Which of the following is the hardest material?

Which of the following is the softest material?

Wood is corroded by

Work hardening of a material

Creep is not exhibited at low temperature by

Silicon percentage in iron castings to have maximum hardness should be about

Heavy duty bearings are usually made of

Rotary driers are generally made of

Corrosion resisting properties of cast iron are significantly improved by the addition of 12 - 15% of

Common house hold glass (i.e., soda-lime glass) is a/an __________ material.

In SO 3 absorber (Contact Process), packing material used is of

To improve the machinability of steel, it is generally subjected to

In hot wire aneomometer used for gas flow measurement, the wire is normally made of

A magnetic material becomes __________ above the Curie temperature.

Hydrochloric acid is __________ corrosive to common metals.

Nickel base alloys with __________ are known as monel metal.

The high expansion metal normally used in the bimetallic thermometer is __________ temperature measurement.

A metallic alloy in which one of the constituent metal is __________ , is called an amalgam.

The process of heating the cold pressed metallic powder is called __________ in powder metallurgy.

__________ does not contain copper as an alloying element,

Copper has very low

Bearings subjected to light load are made of

Caustic soda is produced in a mercury cell having anode and cathode made respectively of moving mercury and

In the kraft (sulphate) process for the paper manufacture, the digestor is made of

Which of the following is produced by addition polymerisation?

Ammonium chloride solution is stored/ treated in __________ vessels/pipes.

Wood metal is not used for making

Evaporators used in caustic soda recovery and production plant are made of

Silicon percentage in acid resistant cast iron is about

Presence of nitrogen in steel

Presence of silicon in steel

Carbon is present in steel wholly in the

Hastelloy C is a good material of construction in chemical process industry, since it is

Spray dryer for evaporating milk to produce milk powder is made of

Pure nickel is

Aluminium alloy is one of the most suitable materials of construction for aircrafts mainly due to its

Babbit metal used for bearings is a____base alloy.

The most commonly used resin for making reinforced plastic is

The hardest material just prior to diamond in Mho's scale is

Urea autoclave is made of

For spinning viscose rayon, the extrusion spinnerettes are made of

Generally __________ are subjected to galvanising (i.e., zinc coating).

Which of the following will have the highest melting point?

Water gas generator is made of

Hammers and railway rails are normally made of

Post weld heat treatment is done by

When iron is rusted, it is

White cast iron is not

White metal is an alloy of

Beehive coke ovens are made of __________ bricks.

Cold worked steel parts are normally subjected to

In cold working of metal as compared to its hot working

The melleability of a material is the property by virtue of which it can be rolled or hammered into thin sheets. Which of the following materials has the miximum malleability?

The electrical conductivity of a __________ decreases with rise in temperature.

Tin coating on metals is not done by

An ideal material of construction for the storage of 50% caustic soda solution would be

Babbit metal is not a

Nickel (56%) and molybdenum (17%) alloys are called

Dry chlorine can be handled in a vessel made of

Which is an amorphous material?

Pick out the correct statement.

Plate and frame filter press is usually made of

Which of the following has the least value of ultimate tensile strength (UTS)?

Maximum consumption of zinc is in

Tin base and lead base alloys are used for bearing materials. Tin compared to lead has lower

Inconel is an alloy of

Non-ferrous metals and hard steels do not exhibit a definite yield point, when pulled in the testing machine and hence for these cases, a better measure of their elastic properties is defined by the __________ stress.

Carbon is present in the combined form (carbide) in case of

Which of the following materials may prove unsuitable for handling acetic acid (glacial & anhydrous) at 40°C?

Cold work tool steel should have

The softest material in Mho's scale (for measuring hardness) is

Lead . . . . . . . .

Lead is

Lead pipe is

Hydrochloric acid absorber in made of

Which of the following is not an alloy of tin?

Which of the following is the easiest to bend?

German silver is an alloy of copper, nickel and

Which of the following has the highest density and the lowest melting point?

Valves in pipe size of 2" and under are normally made of

Wrought iron is a suitable material of construction for handling __________ solutions.

The preferred material of construction for storage tanks for 98% sulphuric acid is

Dilute sulphuric acid is transported in __________ pipes.

Silicone rubber is not resistant to the corrosive action of

With increase in carbide/graphite ratio in cast iron, its

Locomotive boiler tubes are made of __________ alloys.

Coke oven regenerators are made of __________ bricks.

Galvanised iron is

Age hardening is concerned with

Aluminium storage vessel can be used to store

A material no longer behaves elastically beyond

German silver in an alloy of

Which of the following is the lightest of engineering metals?

Glass is corroded by

Photographic plates are coated with

Graphite is a good

Graphite is corroded by

Pipes for bi-cycle frames are made of __________ steel.

Nickel and copper are the basic constituents of

Nickel and molybdenum are the basic constituents of

Nickel as a material of construction

The increase in hardness of metal due to its cold working is termed as the __________ hardening.

Balls in a ball mill are usually made of

Concentrated HCl at 30°C can be stored in a vessel made of

Brine (15% concentration) can be stored in a vessel made of

A bearing metal should not have

White cast iron as compared to grey cast iron is

Brass container is suitable for storing

Hardening of steel is not possible unless it is heated __________ critical point.

Mild steel is a/an __________ steel.

__________ is added in low carbon steel to raise its yield point.

Addition of __________ to the steel helps in increasing the residual magnetism in steel used for making magnets.

Telfon (PTFE) is corroded by

Vycor, a widely used material for making 'thermal wells' in temperature measurement, is a

Electronic structure of a material is generally studied by

__________ alloys have the highest specific strength of all the structural materials out of the following.

Slow plastic deformation of metals under a constant stress is termed as __________ failure.

Which of the following mechanical properties of a material is most structure insensitive?

__________ of a material results, when its strength is increased & ductility is decreased by heating at a relatively lower temperature after cold working.

Muntz metal is a/an alloys of

Caustic soda is transported in __________ lined containers.

Sulphuric acid is mixed with ground phosphate rock (to produce phosphoric acid) in a steel digestor lined with

Which of the following is an alloy of nickel and copper?

Bog iron used for the adsorption of H 2 S from coke oven gas is

Addition of tungsten to steel imparts

With increase in the carbon percentage in the steel, its

A material is able to retain the deformation permanently by virtue of its

Rubber lined pumps can be used to pump

Silico-manganese steels (containing 0.7% Mn, 0.5% C and 2% Si)

Shock resisting steels should possess high

When the steel is subjected to normalising, its __________ decreases.

Molybdenum steels containing 0.15 to 0.40% molybdenum

Which one is remelted and poured into moulds to get cast iron?

Reactor used in the production of polyvinyl chloride (PVC) is made of

Soap kettle used in the production of laundry soap is made of

In the Kraft process of sulphate paper pulp manufacture, the black liquor and the white liquor storage tank is made of

Cast iron is a __________ material.

Iron rust is

Which of the following is a low melting point metal?

Which of the following is the most elastic material?

Visco-elastic behaviour of materials which is time dependent is common in

Nickel (76%) and chromium (15%) alloys are termed as

Karbate is

Kel-F is a material, which is

Hot working of lead is carried out at

A chemical change takes place when iron

Addition of 2% nickel in steel makes it suitable for making

Among the tin containing alloys, __________ consumes the maximum amount of tin.

Metalloid is

Combination of metals and ceramics are called

Cermets are __________ materials.

Mild steel is

Mild steel is used for making

Monel alloy is

Monel metal is an alloy of

The formation of oxide film on a metal due to atmospheric exposure reduces its

Corrosion resistance of steel is increased by the addition of

Tin in its pure form is used for making

All materials obey Hooke's law within elastic limit. When elastic limit is reached, the tensile strain

Acetaldehyde is shipped in __________ drums.

Aqueous nitric acid is stored in __________ vessel.

Babbit metals used for making bearings are

Presence of manganese in alloy steel improves its

Glass lined vessels are not used for handling

Thermosetting resins are those polymers, which

The temperature at which new grains are formed in the metal is called the __________ temperature.

A material capable of undergoing large permanent deformation, when subjected to compression is termed as

Plasticisers are added to polymers to improve their

DDT is shipped in

'Age hardening' of duralumin is due to

The ability of a material to offer resistance to scratching or indentation is a measure of its

Cast iron has

Hardest materials so far found is

Polymerisation reactor used for the production of styrene butadiene rubber (SBR) is made of

Polymerisation reactor used in the production of styrene butadiene rubber (SBR) is made of

The specific gravity of coal depends mainly on its __________ content.

In a plate type heat exchanger, heat transfer plates are never made of

Platinum and silver are corroded by

For storing water and acid free benzol, use a __________ vessel.

A steel alloy containing 36% nickel is called __________ , which has a zero co- efficient of expansion.

Hydrocyanic acid is not shipped in

The carbonating tower used in Solvay process of soda ash manufacture is made of

The material of construction of bearings is

Metal at the top of the electromotive series is

Which of the following would not be a suitable material of construction for handling aqueous hydrofluoric acid (HF) at 100°C ?

In order to be called steel, an alloy should have iron percentage greater than

Carbon percentage is the same in cast iron and

Which one contains the least percentage of carbon?

Spark plugs, ignition tubes and electrodes are made of nickel __________ alloys.

The purpose of nitriding the steel is to

Acetaldehyde is produced by hydration of acetylene in a sulphuric acid solution of mercuric sulphate. Hydration tower is made of

Pick out the wrong statement

A material capable of undergoing large permanent deformation, when subjected to tension is termed as

Which one occupies the lowermost position in the electromotive series of metals?

Carbon is present in the uncombined (graphitic) form in case of

Hastelloy comprises of

Reduction in the grain size reduces the __________ of the material.

The 'bomb' in the bomb calorimeter is made of

Which of the following crystal structures characterises the ferritic stainless steel?

__________ is used for determining the tensile strength of steels.

Sheardising process is used for

Very high sulphur in pig iron makes

Which of the following has the highest compressive strength?

The range of Mho's scale of hardness is from

Purity of electrical grade aluminium should be ≥ __________ percent.

Acid proof stoneware

Steel pipes are normally manufactured by __________ process.

Invar contains the highest percentage of

The most distinguished property of malleable cast iron is its high

Which of the following is not an alloy of nickel and chromium?

Ball bearings are normally made of __________ steel.

Steel balls for ball bearings are generally made of __________ steel.

Clock pendulums are usually made of __________ steel.

Presence of high amount of silicon in cast iron

18/8 steel is a/an __________ stainless steel.

Caustic soda can be stored in __________ drums.

Vessels made of __________ can be used to store dry chlorine.

Ball bearings are generally made of

Bell metal is an alloy of

Brass is an alloy of

Bush bearings are made of

Hydrochloric acid is stored in a__vessel.

A material is called 'ductile', if it can be

The maximum percentage of chromium that can be added to steel is about

Maximum carbon content in any variety of steel can be upto 1.3%. Steel containing 0.4% Carbon is not used for making

Which of the following is the most suitable material of construction for evaporator & its tubes for concentrating NaOH solution to 70%?

Which one has the maximum tensile strength out of the following?

Dielectric strength of a material is

Corrosion involves exchange of electrons in __________ corrosion.

Materials having __________ lattice structure are usually most ductile.

__________ steel is widely used for the manufacture of motor car crankshafts.

Fatigue failure of a material may occur, when it is subjected to __________ stress.

Aqueous nitric acid is stored in

Sulphur melting pit in the sulphuric acid plant is made of

Maximum consumption of copper is in

Which of the following alloys does not contain nickel?

Galvanising is generally done on

Polymorphism is not exhibited by

Thermal shield used in high powered nuclear reactor to protect the walls of the reactor from radiation damage is made of

__________ is used for examining the macro-structure of a material.

Zircalloy used as a fuel cladding material in a nuclear reactor (thermal) is an alloy of zirconium

Manganese in steel affects its

Which of the following contains maximum percentage of carbon?

The phenomenon in which slow extension of material takes place with the time at constant load is called

The fermentor used in the production of pencillin (by deep fermentation process) is made of

Lead lined equipments & vessels are suitable for handling

'Semi steel' is

Carbon supply in pack carburising process is in the form of

Thermoplastic resins are those polymers, which

Most common stainless steel type 316, which is highly resistant to corrosion contains

Spark plugs are made of

Which of the following commercial metals is most abundantly found in India?

Maximum carbon content in cast iron is __________ percent.

Out of the following, copper vessels are the most suitable for the storage of

Stainless steel contains

Which of the following is universally employed as the low expansion metal in the bimetallic thermometer, which is an iron-nickel alloy containing 36% nickel and has very low co-efficient of expansion (l/20th of ordinary metals)?

In drop forging process, the forging is done by dropping the __________ at high velocity.

Most of the common metals have __________ crystal structure.

Chrome vanadium steels usually contain 0.8 to 1.1% Cr, 0.25 to 0.35% C and < 0.25% V. It is

Liners of a ball mill are never made of

Approximate value of the modulus of elasticity for steel is about __________ × 10 6 kg/cm 2 .

Which of the following constituents of cast iron is mainly responsible for imparting it an anti-corrosive property?

An alloy used as thermocouple material comprises of 40% nickel and 60% copper. It is called

Brinell Hardness Number (BHN) for talc is approximately in the range of

Rubber lined vessels are corroded by the action of

The digester of a Gobar gas plant is a

The ability of a material to absorb energy in the elastic range is a measure of its

Which of the following material of construction may be recommended by a chemical engineer for handling a gaseous chlorine (dry or wet) stream in a fluid flow system?

Brass tubes are used in the manufacture of tubes of evaporators used in sugar and salt industries, mainly because of its

Rotary kilns in cement industry are lined with____bricks.

The impure iron (pig iron) that is tapped out from blast furnace contains about __________ percent carbon.

Which of the following is not an alloy of copper and tin?

Cast iron detachable joint is used in __________ pipes.

Containers made of high silicon cast iron (14% Si) are not suitable for the storage of

The softest material just next to talc in the Mhos scale is

Chromel (Nichrome) is an alloy of

The metals occuring at the lower most position in the electromotive series

Atmospheric corrosion of metals result from their

Condenser tubes are not made of

Which of the following is the most prone to atmospheric corrosion?

Bronze is an alloy of copper and

Material of construction of pipe generally used for conveying water in India is

Centrifugal pump made of pyrex or glass can't be used to pump

Babbit metal used for making bearings should have

Tank furnace used for melting of glass is made of

Galvanising is not a zinc diffusion process. A zinc diffusion process is termed as

Nitriding of steel is a process for

The loss of strength in compression which occurs, when there is a gain of strength in tension due to over loading is called

Duralumin is an alloy of

Duriron is

Which of the following crystal structures characterises the austenitic stainless steel?

Which of the following is a light alloy?

Which of the following has no effect on the carbide forming tendency in steels?

Which of the following has a very high carbide forming tendency in steels?

Cast irons are generally specified by their

Compressive strength of wood is usually more along the grains. The tenile strength of wood as compared to that of steel is about

High degree of toughness is a must for

Concrete tank can be used to store

An elastic behaviour of materials is expressed in terms of

Nitriding of steel is done (in electric furnace) at __________ °C.

Cast iron and steel pipes are produced by __________ casting.

Super conductors are those substances, which

Presence of 0.3 to 0.5% arsenic in copper increases its

Amount of energy that a material can absorb before its fracture is a measure of its

Residual magnetism in steel for magnets is increased by the addition of

Lead pipes are not safe for carrying drinking water because water containing dissolved oxygen attacks lead thereby forming poisonous Pb(OH) 2 . Lead pipes are readily corroded by

Lead pipes are not safe for carraying drinking water, because water, containing dissolved oxygen attacks lead thereby forming poisonous Pb(OH) 2 . Lead pipes are readily corroded by

To improve the machinability of steel by its softening, it is subjected to

Which of the following is the most widely used insulating material for steam carray-ing pipelines?

18/8 stainless steel means, that it contains

Lead alone is not used in storing equipment, because it

Tubes of multiple effect evaporator used for concentration of sugar cane juice are made of

High speed steel tools retain their hardness upto a temperature of __________ °C.

The material of construction of pressure mills used for squeezing out the juice from sugar cane is

Which of the following has the least carbon percentage?

Ceramic materials are

Cermets are used for making

Interchain forces are the weakest in case of

Acetylene gas holder is made of

Low carbon steels are those in which carbon percentage is around

Chilled iron castings are

Refined acetic acid storage vessel are made of

Nickel is a __________ material.

Alinco, which is a aluminium-cobalt-nickel steel, is used for making

Biological shield in a nuclear power reactor is made of

Which metal is protected by the layer of its own oxide?

Light weight metallic alloy used in aircraft industry is

Zinc is not used

Cast iron has very high

Cast iron is

Cast iron is having very high

Ability of a material to __________ is indicated by its damping capacity.

Mixing vessel used for the chlorination of methane to produce methyl chloride is made of

Cementite is

Dead mild steel, which contains 0.10 to 0.15 percent carbon is used for making

How many atoms are there per unit cell in a body centred cubic lattice system?

Ceramic materials

__________ moulding process can not be used for thermoplastic plastics.

Carbon tetrachloride can be stored in a storage vessel made of

100% H 2 SO 4 at 30°C can't be stored in a vessel made/lined with

Mercury is transported in metal containers made of

Straight silicon steel (containing Si from 0.5 to 5%) because of their low hysterisis loss and high magnetic permeability are used for electrical appliances. Which of the following electrical appliances made of silicon steel contains maximum percentage of silicon (about 4%)?

Nickel made/clad equipments are suitable for handling

Slow and progressive deformation of a material with time under constant stress is called

Which of the following is not used as the ceramic material in 'cermets'?

The most resistant material to alkaline corrosion is

The addition of antimony in tin-based alloys improves its

The heat treatment process applied to cold formed steel parts is

The softest material just next to talc in the Mho's scale is

__________ can replace tungsten in high speed steel,

Which of the following undergoes granular fracture?

Which of the following alloy steels has the energy saving properties making it suitable for use in electrical machines?

Steel tower used for the storage of oleum

Iron alloyed with carbon upto 2% is called

A suitable material of construction to use with fuming sulphuric acid is

Gas holder of a gobar (cowdung) gas plant is made of

As the impurities are oxidised, the melting point of iron

Wrought iron is