Materials of Construction Flashcards
The addition of antimony in tin-based alloys improves its
deformation resistance
The impure iron (pig iron) that is tapped out from blast furnace contains about __________ percent carbon.
4
Austenitic manganese steel used for making jaws of crushing machines contains about __________ percent manganese.
12 - 14
A suitable material of construction to use with fuming sulphuric acid is
monel
Which of the following materials may prove unsuitable for handling acetic acid (glacial & anhydrous) at 40°C?
Brass, cast iron, mild steel and tin
Acetaldehyde is produced by hydration of acetylene in a sulphuric acid solution of mercuric sulphate. Hydration tower is made of
rubber lined mild steel
Which of the following would not be a suitable material of construction for handling aqueous hydrofluoric acid (HF) at 100°C ?
Stainless steel
Which of the following is not a copper based alloy with nickel?
Inconel
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
endurance limit
Copper is dissolved from its ore by H2SO4 in a percolation tank made of
reinforced concrete lined with lead
Presence of manganese in alloy steel improves its
abrasion resistance & toughness
Sulphuric acid is mixed with ground phosphate rock (to produce phosphoric acid) in a steel digestor lined with
lead or acid-proof bricks
Reduction in the grain size reduces the __________ of the material.
creep resistance
Addition of nickel to copper improves its
hardness
High speed cutting tool steels contain about __________ percent of tungsten.
18 - 20
Mixing vessel used for the chlorination of methane to produce methyl chloride is made of
cast iron
Stainless steel is not corroded by
nitric acid (10%)
The carbonating tower used in Solvay process of soda ash manufacture is made of
cast iron
An ideal material of construction for the storage of 50% caustic soda solution would be
monel
In the Contact process of sulphuric acid manufacture, 98% acid cooler is made of
cast iron
Brine solution is stored/treated in __________ lined vessels/pipes.
nickel
Tin coating on metals is not done by
powder metallurgy
Silicon percentage in iron castings to have maximum hardness should be about
0.8
Which of the following crystal structures characterises the ferritic stainless steel?
Body centred cubic
Polythene (low or high density) containers are not corroded by
sulphuric acid (10%) at room temperature.
Balls in a ball mill are usually made of
steel
A material is able to retain the deformation permanently by virtue of its
plasticity
Coke oven walls are lined with __________ bricks.
silica
Urea autoclave is made of
stainless steel
Carbon content in plain carbon steel is __________ percent.
0.35 to 0.45
Silicon percentage in acid resistant cast iron is about
14
Water gas generator is made of
carbon steel-brick lined
Brinell Hardness Number (BHN) for talc is approximately in the range of
20 - 30
Dies for wire drawing are generally made of
carbides
Babbit metal used for making bearings should have
high-co-efficient of friction between journal and bearing.
Vessels made of __________ can be used to store dry chlorine.
steel or iron
Which of the following alloying elements is present in maximum percentage in high speed steel.
tungsten
Electronic structure of a material is generally studied by
spectroscopic techniques
Which of the following is not used as the ceramic material in ‘cermets’ ?
nitrides
For handling sulphuric acid of 95% strength, the suitable material of construction for pipes is
cast iron
Common house hold glass (i.e., soda-lime glass) is a/an __________ material.
partly crystalline
Cold worked steel parts are normally subjected to
annealing
A bearing metal should not have
low thermal conductivity
__________ is not a case hardening process.
Annealing
The ability of a material to absorb energy in the elastic range is a measure of its
resilience
Phenol is not shipped in
cast iron containers
Aqueous nitric acid is stored in
stainless steel vessel
Thermosetting polymers are
cast moulded
Maximum consumption of lead is in the manufacture of
storage batteries
Clock pendulums are usually made of __________ steel.
none of these
Which of the following is produced by addition polymerisation?
polybutadiene
Which of the following is not shipped in mild steel containers?
formic acid
Maximum carbon content in cast iron is __________ percent.
4.3
Manganese in steel affects its
tensile strength
Lead lined equipments & vessels are suitable for handling
sulphuric acid up to 60°C
Reactor used in the production of polyvinyl chloride (PVC) is made of
nickel or glass lined steel
Brass tubes are used in the manufacture of tubes of evaporators used in sugar and salt industries, mainly because of its
high corrosion resistance
Pick out the wrong statement.
Presence of silicon in steel decreases its electrical resistance.
Hydrocyanic acid is not shipped in
cast iron vessels
Neutraliser tank used for reacting nitric acid with ammonia for the production of ammonium nitrate is made of
stainless steel
Gas holder of a gobar (cowdung) gas plant is made of
mild steel
A measure of toughness of a material is its
yield strength
Polymorphism is not exhibited by
none of these
Which of the following metals in not used for coating of the base metal to guard it against corrosion ?
magnesium
Aqueous nitric acid is stored in __________ vessel.
cast iron
Carbon is present in the uncombined (graphitic) form in case of
cast iron
The damage/deterioration of metals by the __________ action of fluids is called ‘erosion’.
abrasive
Sulphuric acid is mixed with ground phosphate rock (to produce phosphoric acid) in a steel digestor lined with
acid refractory
In cold working of metal as compared to its hot working
appreciable strain hardening is produced
Containers made of high silicon cast iron (14% Si) are not suitable for the storage of
hydrochloric acid (concentrated)
