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Quiz 7
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Q.1
Which of the following mechanical properties of a material is most structure insensitive?
Modulus of elasticity (young
Toughness
Percentage reduction of area
Tensile strength
Q.2
An elastic behaviour of materials is expressed in terms of
Hysterisis loop area
Stress-strain curve
Relaxation time
None of these
Q.3
__________ of a material results, when its strength is increased & ductility is decreased by heating at a relatively lower temperature after cold working.
Solid solution hardening
Screw dislocation
Strain ageing
Twinning
Q.4
__________ does not contain tin as an alloying material.
Brass
Pewter
Solder
Babbit metal
Q.5
Which of the following finds the least commercial use?
Pure iron
High silicon iron
Low carbon steel
High carbon steel
Q.6
Pick out the wrong statement.
Tin can be readily and very easily drawn into very fine wire
Tin can be severely cold worked without the necessity of annealing due to its low recrystallisation temperature
Tin exists in two allotropic forms
The predominant use of tin is in the form of coating for steel & copper alloys
Q.7
An alloy of iron containing 4% carbon is called
High carbon steel
Wrought iron
Mild steel
None of these
Q.8
German silver used for decorative purposes contains maximum percentage of
Silver
Copper
Zinc
Nickel
Q.9
H₂SO₄ (< 50% concentration) is corrosive to
Aluminium, mild steel, stainless steel, concrete & tin
Copper, cast iron & high silicon iron (14% Si)
Rubber (butyl and hard), silicone rubber & teflon
Glass, graphite, porcelain & stoneware
Q.10
Pick out the wrong statement.
The toughness of a material decreases, when it is heated
Crane hooks are normally made of wrought iron
Cold working of a metal decreases its fatigue strength
The temperature at which new grains are formed in a metal is known as the recrystallisation temperature
Q.11
Mild steel is used for making
Fish plates
Die block
Channels
Drop forging
Q.12
Monel alloy is
The costliest of all the alloys of nickel
Not suitable for making kitchen utensils
Used for making steam valves and turbine blades as it resists steam attack at high temperature
Not used in cast and wrought forms
Q.13
Which of the following is an alloy of nickel and copper?
Hastelloy
Duriron
Monel
Inconel
Q.14
Bog iron used for the adsorption of H?S from coke oven gas is
An intimate mixture of saw dust and iron dust (i.e. moist ferric hydroxide)
Iron impregnated with resin (usually bakelite)
Carbon free iron
None of these
Q.15
Muntz metal is a/an alloys of
Magnesium & tin
Ferrous material
Lead & tin
Copper & zinc
Q.16
Caustic soda is transported in __________ lined containers.
Glass
Nickel
Neoprene
Either B or C
Q.17
Sulphuric acid is mixed with ground phosphate rock (to produce phosphoric acid) in a steel digestor lined with
Acidic refractory
Rubber
Karbate
Lead or acid-proof bricks
Q.18
A hardened steel essentially contains
Sorbite
Troostite
Martensite
None of these
Q.19
Diamagnetic materials are magnetised
Strongly
Only slightly
With eddy currents only
In a direction opposite to that of the applied field
Q.20
Monel metal is an alloy of
Molybdenum and nickel
Nickel and copper
Molybdenum and aluminium
Molybdenum and zinc
Q.21
The formation of oxide film on a metal due to atmospheric exposure reduces its
Toughness
Stiffness
Creep limit
All of the above
Q.22
Addition of tungsten to steel imparts
Magnetic properties
Cutting hardness
Corrosion resistance
Ductility
Q.23
With increase in the carbon percentage in the steel, its
Hardness increases
Ductility reduces
Tensile strength increases
All of the above
Q.24
Zircalloy used as a fuel cladding material in a nuclear reactor (thermal) is an alloy of zirconium
Tin, nickel, iron and chromium
And graphite
And copper
None of these
Q.25
Manganese in steel affects its
Ductility
Tensile strength
Hardness
None of these
Q.26
Which of the following contains maximum percentage of carbon?
Boiler plate steel
Rail steel
Saws for cutting steel
Railway spring steel
Q.27
Which of the following alloys does not contain nickel?
Chlorinet - 2 alloy
Monel
Inconel
Babbit metal
Q.28
Galvanising is generally done on
Non-ferrous metals
Low carbon steel
Stainless steel
Cast iron
Q.29
Lead is
Not resistant to corrosion
Used as a cathodic material
Not used as pigment (in its compound forms) for paints
Used as a shock absorber (in mattress form) between the foundation an steel framework of skyscrapper buildings
Q.30
Lead pipe is
Especially resistant to solutions containing H₂SO₄
Usually joined by burning (e.g. by melting to adjacent pieces with a torch)
Having very low elastic limit resulting in permanent deformation from either mechanical or thermal strain
All of the above
Q.31
Among the tin containing alloys, __________ consumes the maximum amount of tin.
Solder
White metal
Pewter matal
Bronzes
Q.32
Metalloid is
Highly electronegative in nature
An element which exhibits the properties of both metal & non-metal
An alloy
All of the above
Q.33
Combination of metals and ceramics are called
Metalloy
Cermets
Pellets
Non-crystalline ceramics
Q.34
Which of the following materials may prove unsuitable for handling acetic acid (glacial & anhydrous) at 40°C?
Silicone rubber, teflon, procelain and wood
Nickel, monel, stainless steel and graphite
Aluminium, copper, high silicon iron
Brass, cast iron, mild steel and tin
Q.35
A material is able to retain the deformation permanently by virtue of its
Elasticity
Plasticity
Ductility
Malleability
Q.36
Karbate is
A mixture of iron dust and saw dust
Carbon impregnated with resin (usually bakelite)
An acid resistant material
Both B and C
Q.37
The phenomenon in which slow extension of material takes place with the time at constant load is called
Plasticity
Creep
Elasticity
Ductility
Q.38
The fermentor used in the production of pencillin (by deep fermentation process) is made of
Glass
Glass lined steel
High silicon cast iron
Procelain
Q.39
Polymorphism is not exhibited by
Carbon
Iron
Phosphorous
None of these
Q.40
Thermal shield used in high powered nuclear reactor to protect the walls of the reactor from radiation damage is made of
Concrete
Steel
Zircalloy
Graphite
Q.41
__________ is used for examining the macro-structure of a material.
Metallurgical microscope
Optical microscope
X-rays
Visual inspection by naked eye
Q.42
Hydrochloric acid absorber in made of
Cast iron
Mild steel
Karbate
Stainless steel
Q.43
Which of the following is not an alloy of tin?
White-bearing metal
Pewter type metal
Soft solder
German silver
Q.44
Cermets are __________ materials.
Refractory
Reinforced
Abrasive
Fully metallic
Q.45
Mild steel is
A low carbon steel (0.05 to 0.3% carbon)
Highly resistant to corrosion (as much as stainless steel)
A high carbon steel (0.5 to 1.5% carbon)
Very poor in strength & ductility
Q.46
Cold work tool steel should have
High toughness
Poor hardenability
High wear resistance
All of the above
Q.47
Pick out the wrong statement.
Etal/alloys having hexagonal crystal lattice structure are less malleable than those having cubic crystal lattice structure
Etal/alloys having body centred cubic (bcc) crystal lattice structure is stronger & less ductile than those having face centred cubic (fcc) crystal lattice structure
Ungsten has a body centred cubic (bcc) crystal lattice structure
Oth ferritic & austenitic stainless steel has a face centred cubic (fcc) crystal structure
Q.48
Kel-F is a material, which is
Chemically known as polychlorotrifluor-oethylene (PTFE)
Having excellent chemical & high temperature resistance (upto 200°C)
Having elastomeric properties
All of the above
Q.49
Hot working of lead is carried out at
75° C
373° K
150° C
Room temperature
Q.50
A chemical change takes place when iron
Rusts
Melts
Is heated
None of these
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