Engineering Materials MCQs : This section focuses on the "Engineering Materials". These Multiple Choice Questions (MCQs) should be practiced to improve the Engineering Materials skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
A material is known as allotropic or polymorphic if it
A. Has a fixed structure under all conditions
B. Exists in several crystal forms at different temperatures
C. Responds to heat treatment
D. Has its atoms distributed in a random pattern
Question 2
Corrosion resistance of steel is increased by adding
A. Chromium and nickel
B. Nickel and molybdenum
C. Aluminium and zinc
D. Tungsten and sulphur
Question 3
Pearlite consists of
A. 13% carbon and 87% ferrite
B. 13% cementite and 87% ferrite
C. 13% ferrite and 87% cementite
D. 6.67% carbon and 93.33% iron
Question 4
Which of the following impurity in cast iron makes it hard and brittle?
A. Silicon
B. Sulphur
C. Manganese
D. Phosphorus
Question 5
The lower critical point for all steels is
A. 600°C
B. 700°C
C. 723°C
D. 913°C
Question 6
The ultimate tensile strength and yield strength of most of the metals, when temperature falls from 0 to 100°C will
A. Increase
B. Decrease
C. Remain same
D. First increase and then decrease
Question 7
Perminvar alloy having constant permeability is an alloy of
A. Nickel, copper and iron
B. Nickel, copper and zinc
C. Copper, nickel and antimony
D. Iron, zinc and bismuth
Question 8
The ultimate tensile strength of low carbon steel by working at a high strain rate will
A. Decrease
B. Increase
C. Remain constant
D. First increase and then decrease
Question 9
Steel with __________ carbon is known as hypo-eutectoid steel.
A. 0.80%
B. Below 0.8%
C. Above 0.8%
D. None of these
Question 10
Age hardening is related to
A. Duralumin
B. Brass
C. Copper
D. Silver
Question 11
When low carbon steel is heated up to upper critical temperature
A. There is no change in grain size
B. The average grain size is a minimum
C. The grain size increases very rapidly
D. The grain size first increases and then decreases very rapidly
Question 12
If a refractory contains high content of silicon, it means refractory is
A. Acidic
B. Basic
C. Neutral
D. Brittle
Question 13
Eutectoid reaction occurs at
A. 600°C
B. 723°C
C. 1147°C
D. 1493°C
Question 14
A coarse grained steel
A. Is less tough and has a greater tendency to distort during heat treatment
B. Is more ductile and has a less tendency to distort during heat treatment
C. Is less tough and has a less tendency to distort during heat treatment
D. Is more ductile and has a greater tendency to distort during heat treatment
Question 15
The ability of a material to absorb energy in the plastic range is called
A. resilience
B. creep
C. fatigue strength
D. toughness
Question 16
Steel made from phosphate iron is
A. Brittle
B. Hard
C. Ductile
D. Tough
Question 17
Isotropic materials are those which have the same
A. Elastic properties in all directions
B. Stresses induced in all directions
C. Thermal properties in all directions
D. Electric and magnetic properties in all directions
Question 18
Hardness of upper bainite (acicular structure) is about
A. RC 65
B. RC 48
C. RC 57
D. RC 80
Question 19
A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as
A. Allotropic change
B. Recrystallization
C. Heat treatment
D. Precipitation
Question 20
The property of a material due to which it breaks with little permanent distortion, is called
A. brittleness
B. ductility
C. malleability
D. plasticity
Question 21
Killed steels' are those steels
A. Which are destroyed by burning
B. Which after their destruction are recycled to produce fresh steel
C. Which are deoxidized in the ladle with silicon and aluminium
D. In which carbon is completely burnt
Question 22
Inconel contains
A. 65% nickel, 15% chromium and 20% iron
B. 68% nickel, 29% copper and 3% other constituents
C. 80% nickel and 20% chromium
D. 80% nickel, 14% chromium and 6% iron
Question 23
The electric process of steel making is especially adopted to
A. alloy and carbon tool steel
B. magnet steel
C. high speed tool steel
D. all of these
Question 24
The unique property of cast iron is its high
A. Malleability
B. Ductility
C. Surface finish
D. Damping characteristics
Question 25
1841 high speed steel contains
A. Vanadium 4%, chromium 18% and tungsten 1%
B. Vanadium 1%, chromium 4% and tungsten 18%
C. Vanadium 18%, chromium 1% and tungsten 4%
D. None of the above
Question 26
The toughness of a material __________ when it is heated.
A. Remain same
B. Decreases
C. Increases
D. None of these
Question 27
Solder is an alloy consisting of
A. Tin, antimony, copper
B. Tin and copper
C. Tin and lead
D. Lead and zinc
Question 28
In compression, a prism of brittle material will break
A. By forming a bulge
B. By shearing along oblique plane
C. In direction perpendicular to application of load
D. By crushing into thousands of pieces
Question 29
Which of the following is the binding material in cemented carbides?
A. Cobalt
B. Nickel
C. Vanadium
D. Iron
Question 30
Chilled cast iron has
A. No graphite
B. A very high percentage of graphite
C. A low percentage of graphite
D. Graphite as its basic constituent of composition
Question 31
Which of the following steel making process is being adopted at Rourkela (in India) Steel Plant?
A. Bessemer process
B. Open hearth process
C. Electric process
D. LD process
Question 32
Which of the following statement is incorrect about duralumin?
A. It is prone to age hardening
B. It can be forged
C. It has good machining properties
D. It is lighter than pure aluminium
Question 33
In nodular iron, graphite is in the form of
A. Cementite
B. Free carbon
C. Flakes
D. Spheroids
Question 34
Free cutting steels
A. Contain carbon in free from
B. Require minimum cutting force
C. Is used where rapid machining is the prime requirement
D. Can be cut freely
Question 35
Phosphor bronze contains
A. 0.5% of phosphorous
B. 1% phosphorous
C. 2.5% phosphorous
D. None of the above
Question 36
A reversible change in the atomic structure of steel with corresponding change in the properties is known as
A. Molecular change
B. Physical change
C. Allotropic change
D. Solidus change
Question 37
Bronze is an alloy of
A. Copper and zinc
B. Copper and tin
C. Copper, tin and zinc
D. None of these
Question 38
The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is
A. 770°C
B. 910°C
C. 1050°C
D. Below recrystallization temperature
Question 39
A material is said to be allotropic, if it has
A. fixed structure at all temperatures
B. atoms distributed in random pattern
C. different crystal structures at different temperatures
D. any one of the above
Question 40
Which of the following statement is true about brittle fracture?
A. High temperature and low strain rates favour brittle fracture
B. Many metals with hexagonal close packed (H.C.P) crystal structure commonly show brittle fracture
C. Brittle fracture is always preceded by noise
D. Cup and cone formation is characteristic for brittle materials
Question 41
Iron ore is usually found in the form of
A. Oxides
B. Carbonates
C. Sulphides
D. All of these
Question 42
For the allotropic forms of iron, the points of arrest are
A. The points where no further change occurs
B. Constant for all metals
C. The points where there is no further flow of metal
D. The points of discontinuity
Question 43
Pick up the wrong statement
A. Aluminium in steel results in excessive grain growth
B. Manganese in steel induces hardness
C. Nickel and chromium in steel helps in raising the elastic limit and improve the resilience and ductility
D. Tungsten in steels improves magnetic properties and hardenability
Question 44
The composition of silver solder is
A. Silver, copper, zinc
B. Silver, tin, nickel
C. Silver, lead, zinc
D. Silver, copper, aluminium
Question 45
Which of the following process of steel making is in operation at Tata Iron and Steel Works, Jamshedpur?
A. Bessemer process
B. Open hearth process
C. Duplex process
D. Electric process
Question 46
Silicon when added to copper improves
A. machinability
B. hardness
C. hardness and strength
D. strength and ductility
Question 47
In mottled cast iron, carbon is available in
A. Free form
B. Combined form
C. Nodular form
D. Partly in free and partly in combined state
Question 48
The lower critical temperature
A. decreases as the carbon content in steel increases
B. increases as the carbon content in steel increases
C. is same for all steels
D. depends upon the rate of heating
Question 49
An example of amorphous material is
A. Zinc
B. Lead
C. Silver
D. Glass
Question 50
Dislocations in materials refer to the following type of defect
A. Point defect
B. Line defect
C. Plane defect
D. Volumetric defect
Question 51
Blast furnace produces following by reduction of iron ore
A. Cast iron
B. Pig iron
C. Wrought iron
D. Malleable iron
Question 52
In high speed steels, manganese is used to tougher the metal and to increase its
A. Yield point
B. Critical temperature
C. Melting point
D. Hardness
Question 53
The crystal structure of brass is
A. F.C.C.
B. B.C.C.
C. H.C.P.
D. Orthorhombic crystalline structure
Question 54
Aluminium bronze contains aluminium and copper in the ratio of
A. 50 : 50
B. 40 : 60
C. 60 : 40
D. 10 : 90
Question 55
Which of the following metal shrinks most from molten state to solid state?
A. Cast iron
B. Cast steel
C. Brass
D. Admiralty metal
Question 56
Which of the following statement is correct?
A. The product produced by blast-furnace is called cast iron
B. The pig iron is the name given to the product produced by cupola
C. The cast iron has high tensile strength
D. The chilled cast iron has no graphite
Question 57
The charge is fed into the blast furnace through the
A. stack
B. throat
C. bosh
D. tuyers
Question 58
Which of the following property is desirable for materials used in tools and machines?
A. Elasticity
B. Plasticity
C. Ductility
D. Malleability
Question 59
The steel widely used for motor car crankshafts is
A. Nickel steel
B. Chrome steel
C. Nickel-chrome steel
D. Silicon steel
Question 60
Connecting rod is, usually, made from
A. Low carbon steel
B. High carbon steel
C. Medium carbon steel
D. High speed steel
Question 61
Nodular cast iron is produced by adding __________ to the molten cast iron.
A. nickel
B. chromium
C. copper
D. magnesium
Question 62
Iron ore is, usually, found in the form of
A. oxides
B. carbonates
C. sulphides
D. all of these
Question 63
Nimonic contains __________ percentage of nickel as that of Inconel.
A. Same
B. Less
C. More
D. None of these
Question 64
The presence of sulphur in pig iron makes
A. It easily machinable
B. It brittle
C. It hard
D. The casting unsound
Question 65
The hardness of steel primarily depends on
A. Percentage of carbon
B. Percentage of alloying elements
C. Heat treatment employed
D. Shape of carbides and their distribution in iron
Question 66
A cold chisel is made of
A. Mild steel
B. Cast iron
C. H.S.S.
D. High carbon
Question 67
When the steel is normalised, its
A. yield point increases
B. ductility decreases
C. ultimate tensile strength increases
D. all of these
Question 68
The type of space lattice found in gamma-iron is
A. face centred cubic space lattice
B. body centred cubic space lattice
C. close packed hexagonal space lattice
D. none of these
Question 69
Delta iron occurs at temperature of
A. Room temperature
B. Above melting point
C. Between 1400°C and 1539°C
D. Between 910°C and 1400°C
Question 70
Tin base white metals are used where the bearings are subjected to
A. Large surface wear
B. Elevated temperatures
C. Light load and pressure
D. High pressure and load
Question 71
Blast furnace is used to produce
A. Pig iron
B. Cast iron
C. Wrought iron
D. Steel
Question 72
In low carbon steels, ________ raises the yield point and improves the resistance to atmospheric corrosion.
A. Sulphur
B. Phosphorus
C. Manganese
D. Silicon
Question 73
Amorphous material is one
A. In which atoms align themselves in a geometric pattern upon solidification
B. In which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid
C. Which is not attacked by phosphorous
D. Which emits fumes on melting
Question 74
The dieing down of a white flame during the operation of a bessemer converter indicates that the air is burning out silicon and manganese.
A. Yes
B. No
Question 75
The metal suitable for bearings subjected to light loads, is
A. Silicon bronze
B. White metal
C. Monel metal
D. Phosphor bronze
Question 76
Pearlite is a combination of
A. Ferrite and cementite
B. Cementite and gamma iron
C. Ferrite and austenite
D. Ferrite and iron graphite
Question 77
Gun metal contains
A. 70% copper and 30% zinc
B. 90% copper and 10% tin
C. 85 - 92% copper and rest tin with little lead and nickel
D. 70 - 78% copper and rest tin
Question 78
Pick up the wrong statement Nickel and chromium in steel help in
A. Providing corrosion resistance
B. Improving machining properties
C. Providing high strength at elevated temperatures
D. Raising the elastic limit
Question 79
Duralumin contains
A. 3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium
B. 3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium
C. 4 to 4.5% magnesium, 3 to 4% copper and rest aluminium
D. 5 to 6% tin, 2 to 3% copper and rest aluminium
Question 80
Basic constituents of Monel metal are
A. Nickel, copper
B. Nickel, molybdenum
C. Zinc, tin, lead
D. Nickel, lead and tin
Question 81
The aluminium alloy, mainly used, for anodized utensil manufacture, is
A. Duralumin
B. Y-alloy
C. Magnalium
D. Hindalium
Question 82
The percentage carbon content in wrought iron is about
A. 0.02
B. 0.1
C. 2
D. 0.4
Question 83
Cyaniding is the process of
A. Dipping steel in cyanide bath
B. Reacting steel surface with cyanide salts
C. Adding carbon and nitrogen by heat treatment of steel to increase its surface hardness
D. Obtaining cyanide salts
Question 84
Which of the following is used for bearing liner?
A. Gun metal
B. Bronze
C. Bell metal
D. Babbitt metal
Question 85
The coordination number of a face centered cubic space lattice is
A. Six
B. Twelve
C. Eighteen
D. Twenty
Question 86
Acidic solution is one which has pH value
A. Greater than 7
B. Less than 7
C. Equal to 7
D. pH value has nothing to do with neutral solution
Question 87
Pure iron is the structure of
A. Ferrite
B. Pearlite
C. Austenite
D. Ferrite and cementite
Question 88
The hardness of steel increases if it contains
A. pearlite
B. ferrite
C. cementite
D. martensite
Question 89
Y-alloy contains
A. 3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium
B. 3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium
C. 4 to 4.5% magnesium, 3 to 4% copper and rest aluminium
D. 5 to 6% tin, 2 to 3% copper and rest aluminium
Question 90
The metal suitable for bearings subjected to heavy loads, is
A. Silicon bronze
B. White metal
C. Monel metal
D. Phosphor bronze
Question 91
Recrystallization temperature can be lowered by
A. Purification of metal
B. Grain refinement
C. Working at lower temperature
D. All of the above
Question 92
The machinability of aluminium increases when _________ is added to aluminium.
A. Copper
B. Magnesium
C. Silicon
D. Lead and bismuth
Question 93
The following element can't impart high strength at elevated temperature
A. Manganese
B. Magnesium
C. Nickel
D. Silicon
Question 94
The electric process of steel making is especially adapted to
A. Alloy and carbon tool steel
B. Magnet steel
C. High speed tool steel
D. All of these
Question 95
Manganese in steel increases its
A. Tensile strength
B. Hardness
C. Ductility
D. Fluidity
Question 96
Pig iron is the name given to
A. Raw material for blast furnace
B. Product of blast furnace made by reduction of iron ore
C. Iron containing huge quantities of carbon
D. Iron in molten form in the ladles
Question 97
In process annealing, the hypo eutectoid steel is
A. Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air
B. Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
C. Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace
D. Heated below or closes to the lower critical temperature and then cooled slowly
Question 98
Which is false statement about annealing? Annealing is done to
A. Relieve stresses
B. Harden steel slightly
C. Improve machining characteristic
D. Soften material
Question 99
The alloying element which increases residual magnetism and coercive magnetic force in steel for magnets is
A. chromium
B. nickel
C. vanadium
D. cobalt
Question 100
Maximum percentage of carbon in austenite is
A. 0.03%
B. 0.26%
C. 0.80%
D. 1.70%
Question 101
Closed packed hexagonal space lattice is found in
A. zinc, magnesium, cobalt, cadmium, antimony and bismuth
B. gamma-iron, aluminium, copper, lead, silver and nickel
C. alpha-iron, tungsten, chromium and molybdenum
D. none of the above
Question 102
Hardness of martensite is about
A. RC 65
B. RC 48
C. RC 57
D. RC 80
Question 103
The hardness is the property of a material due to which it
A. can be drawn into wires
B. breaks with little permanent distortion
C. can cut another metal
D. can be rolled or hammered into thin sheets
Question 104
In low carbon steels, presence of small quantities of sulphur improves
A. Weldability
B. Formability
C. Machinability
D. Hardenability
Question 105
Alnico, an alloy used extensively for permanent magnets contains iron, nickel, aluminium and cobalt in the following ratio
A. 50 : 20 : 20 : 10
B. 40 : 30 : 20 : 10
C. 50 : 20 : 10 : 20
D. 30 : 20 : 30 : 20
Question 106
Addition of lead and bismuth to aluminium results in
A. Improvement of casting characteristics
B. Improvement of corrosion resistance
C. One of the best known age and precipitation hardening systems
D. Improving machinability
Question 107
Cast iron is manufactured in
A. blast furnace
B. cupola
C. open hearth furnace
D. bessemer converter
Question 108
Depth of hardness of steel is increased by addition of
A. Nickel
B. Chromium
C. Tungsten
D. Vanadium
Question 109
In full annealing, the hypo eutectoid steel is heated from 30°C to 50°C above the upper critical temperature and then cooled
A. In still air
B. Slowly in the furnace
C. Suddenly in a suitable cooling medium
D. Any one of these
Question 110
In which of the following cases, consideration of creep is important
A. Flywheel of steam engine
B. Cast iron pipes
C. Cycle chains
D. Gas turbine blades
Question 111
Macrostructure of a material is, generally, examined by
A. Naked eye
B. Optical microscope
C. Metallurgical microscope
D. X-ray techniques
Question 112
Corrosion resistance of steel is increased by addition of
A. Chromium and nickel
B. Sulphur, phosphorus, lead
C. Vanadium, aluminium
D. Tungsten, molybdenum, vanadium, chromium
Question 113
The alloy used for making electrical resistances and heating elements is
A. Nichrome
B. Invar
C. Magnin
D. Elinvar
Question 114
Which of the following has a fine gold colour and is used for imitation jewellery?
A. Silicon bronze
B. Aluminium bronze
C. Gun metal
D. Babbitt metal
Question 115
Nickel in steel
A. Improves wear resistance, cutting ability and toughness
B. Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
C. Improves cutting ability and reduces hardenability
D. Gives ductility, toughness, tensile strength and anti-corrosion properties
Question 116
Which of the following has a fine gold colour and is used for imitation jewellery?
A. Silicon bronze
B. Aluminium bronze
C. Gun metal
D. Babbit metal
Question 117
High carbon steel carries carbon percentage
A. 0.1 to 0.3%
B. 0.3 to 0.6%
C. 0.6 to 0.8%
D. 0.8 to 1.5%
Question 118
Permalloy is a
A. Kind of stainless steel
B. None ferrous alloy
C. Polymer
D. Nickel and iron alloy having high permeability
Question 119
The charge is fed into the blast furnace through the
A. Stack
B. Throat
C. Bosh
D. Tyres
Question 120
Nodular cast iron is produced by adding ________ to the molten cast iron.
A. Nickel
B. Chromium
C. Copper
D. Magnesium
Question 121
The strength is the ability of a material to resist
A. Deformation under stress
B. Externally applied forces with breakdown or yielding
C. Fracture due to high impact loads
D. None of these
Question 122
Tensile strength of steel can be safely increased by
A. Adding carbon up to 2.8%
B. Adding carbon up to 6.3%
C. Adding carbon up to 0.83%
D. Adding small quantities of copper
Question 123
Ductile cast iron
A. Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron
B. Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
C. Is produced by annealing process. It is soft, tough and easily machined metal
D. Is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material
Question 124
The machinability of steel is improved by adding
A. Nickel
B. Chromium
C. Nickel and chromium
D. Sulphur, lead and phosphorus
Question 125
Delta-iron occurs between the temperature ranges of
A. 400°C to 600°C
B. 600°C to 900°C
C. 900°C to 1400°C
D. 1400°C to 1530°C
Question 126
Admiralty brass used for steam condenser tubes contains copper and zinc in the following ratio
A. 50 : 50
B. 30 : 70
C. 70 : 30
D. 40 : 60
Question 127
Heavy duty leaf and coil springs contain carbon of the following order
A. 0.20%
B. 0.50%
C. 0.80%
D. 1.00%
Question 128
The material widely used for making pendulums of clocks is
A. Stainless steel
B. High speed steel
C. Heat resisting steel
D. Nickel steel
Question 129
Maximum percentage of carbon in ferrite is
A. 0.03%
B. 0.06%
C. 0.10%
D. 0.25%
Question 130
In induction hardening ________ is high.
A. Current
B. Voltage
C. Frequency
D. Temperature
Question 131
The heat treatment process used for softening hardened steel is
A. carburising
B. normalising
C. annealing
D. tempering
Question 132
Free carbon in iron makes the metal
A. soft and gives a coarse grained crystalline structure
B. soft and gives a fine grained crystalline structure
C. hard and gives a coarse grained crystalline structure
D. hard and gives a fine grained crystalline structure
Question 133
Normalising of steel is done to
A. Refine the grain structure
B. Remove strains caused by cold working
C. Remove dislocations caused in the internal structure due to hot working
D. All of the above
Question 134
The correct composition of Babbitt metal is
A. 87.75% Sn, 4% Cu, 8% Sb, 0.25% Bi
B. 90% Sn, 2% Cu, 4% Sb, 2% Bi, 2% Mg
C. 87% Sn, 4% Cu, 8% Sb, 1% Al
D. 82% Sn, 4% Cu, 8% Sb, 3% Al, 3% Mg
Question 135
Body centered cubic space lattice is found in
A. Zinc, magnesium, cobalt, cadmium, antimony and bismuth
B. Gamma iron, aluminium, copper, lead, silver and nickel
C. Alpha iron, tungsten, chromium and molybdenum
D. None of the above
Question 136
Pipes for bicycle frames are made of
A. Cold rolled steel
B. Hot rolled steel
C. Forged steel
D. Cast steel
Question 137
In full annealing, the hypo-eutectoid steel is heated from 30° C to 50° C above the upper critical temperature and then cooled
A. in still air
B. slowly in the furnace
C. suddenly in a suitable cooling medium
D. any one of these
Question 138
Cast iron is a
A. ductile material
B. malleable material
C. brittle material
D. tough material
Question 139
The material in which the atoms are arranged chaotically, is called
A. Amorphous material
B. Mesomorphous material
C. Crystalline material
D. None of these
Question 140
For a steel containing 0.8% carbon
A. There is no critical point
B. There is only one critical point
C. There are two critical points
D. There can be any number of critical points
Question 141
Dow metal contains
A. 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
B. 92.5% aluminium and, 4% copper, 2% nickel and 1.5% Mg
C. 90% aluminium and 90% copper
D. 90% magnesium and 9% aluminium with some copper
Question 142
Which is false statement about normalizing? Normalizing is done to
A. Refine grain structure
B. Reduce segregation in casting
C. Improve mechanical properties
D. Induce stresses
Question 143
Which of the following represents the allotropic forms of iron?
A. Alpha iron, beta iron and gamma iron
B. Alpha iron and beta iron
C. Body centered cubic iron and face centered cubic iron
D. Alpha iron, gamma from and delta iron
Question 144
Connecting rod is usually made of
A. Aluminium
B. Low carbon steel
C. Medium carbon steel
D. High carbon steel
Question 145
Quenching is not necessary when hardening is done by
A. Case hardening
B. Flame hardening
C. Nitriding
D. Any one of these
Question 146
The basic constituents of Hastelloy are
A. Aluminium, copper etc.
B. Nickel, molybdenum etc.
C. Nickel, Copper, etc.
D. All of the above
Question 147
Basic solution is one which has pH value
A. Greater than 7
B. Equal to 7
C. Less than 7
D. pH value has nothing to do with basic solution
Question 148
Which of the following alloys does not have copper as one of the constituents?
A. Delta metal
B. Monel metal
C. Constantan
D. Nichrome
Question 149
Beryllium bronze has
A. High yield point
B. High fatigue limit
C. Both (A) and (B)
D. None of these
Question 150
Slow plastic deformation of metals under a constant stress is known as
A. Creep
B. Fatigue
C. Endurance
D. Plastic deformation
Question 151
Which of the following statements are true for annealing of steels?
A. Steels are heated to 500 to 700°C
B. Cooling is done slowly and steadily
C. Internal stresses are relieved
D. All of these
Question 152
Smelting is the process of
A. removing the impurities like clay, sand etc. from the iron ore by washing with water
B. expelling moisture, carbon dioxide, sulphur and arsenic from the iron ore by heating in shallow kilns
C. reducing the ore with carbon in the presence of a flux
D. all of the above
Question 153
When the steel is normalized, its
A. Yield point increases
B. Ductility decreases
C. Ultimate tensile strength increases
D. All of these
Question 154
The alloy, mainly used for corrosion resistance in stainless steels is
A. Silicon
B. Manganese
C. Carbon
D. Chromium
Question 155
The ability of a material to resist fracture due to high impact loads, is called
A. Strength
B. Stiffness
C. Toughness
D. Brittleness
Question 156
Which of the following pipes is least corrosion resistant?
A. Brass
B. Mild steel
C. Cast iron
D. Wrought iron
Question 157
Melting point of iron is
A. 1539°C
B. 1601°C
C. 1489°C
D. 1712°C
Question 158
Monel metal contains
A. 63 to 67% nickel and 30% copper
B. 88% copper and 10% tin and rest zinc
C. Alloy of tin, lead and cadmium
D. Malleable iron and zinc
Question 159
The coke in the charge of blast furnace
A. Controls the grade of pig iron
B. Acts as an iron bearing mineral
C. Supplies heat to reduce ore and melt the iron
D. Forms a slag by combining with impurities
Question 160
Malleable cast iron
A. Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron
B. Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
C. Is produced by annealing process. It is soft, tough, and easily machined metal
D. Is produced by small additions of magnesium (or cerium) in the ladle. Graphite is in the nodular or spheroidal form and is well dispersed throughout the material
Question 161
Iron is
A. Paramagnetic
B. Ferromagnetic
C. Ferroelectric
D. Dielectric
Question 162
An alloy of copper, tin and zinc is known as
A. Brass
B. Bronze
C. Gun metal
D. Muntz metal
Question 163
The material in which the atoms are arranged regularly in some directions but not in others, is called
A. amorphous material
B. mesomorphous material
C. crystalline material
D. none of these
Question 164
When steel containing less than 0.8% carbon is cooled slowly from temperatures above or within the critical range, it consists of
A. Mainly ferrite
B. Mainly pearlite
C. Ferrite and pearlite
D. Pearlite and cementite
Question 165
Which of the following statement is wrong?
A. Steel with 0.8% carbon is wholly pearlite
B. The amount of cementite increases with the increase in percentage of carbon in iron
C. A mechanical mixture of 87% cementite and 13% ferrite is called pearlite
D. The cementite is identified as round particles in the structure
Question 166
Mild steel belongs to the following category
A. Low carbon steel
B. Medium carbon steel
C. High carbon steel
D. Alloy steel
Question 167
Crystal structure of a material is, generally, examined by
A. naked eye
B. optical microscope
C. metallurgical microscope
D. X-ray techniques
Question 168
Nodular iron has
A. High machinability
B. Low melting point
C. High tensile strength
D. All of the above
Question 169
White cast iron has
A. Carbon in the form of carbide
B. Low tensile strength
C. High compressive strength
D. All of these
Question 170
The unit cells
A. contain the smallest number of atoms which when taken together have all the properties of the crystals of the particular metal
B. have the same orientation and their similar faces are parallel
C. may be defined as the smallest parallelopiped which could be transposed in three coordinate directions to build up the space lattice
D. all of the above
Question 171
Dye penetrant method is generally used to locate
A. core defects
B. surface defects
C. superficial defects
D. temporary defects
Question 172
Cobalt in steel
A. Improves wear resistance, cutting ability and toughness
B. Refines grain size and produces less tendency to carburisation, improve corrosion and heat resistant proper ties
C. Improves cutting ability and reduce hardenability
D. Gives ductility, toughness, tensile strength and anti corrosion property
Question 173
Delta metal is an alloy of
A. Copper, zinc and iron
B. Iron, nickel and copper
C. Iron, lead and tin
D. Iron, aluminium and magnesium
Question 174
Cast iron is characterized by minimum of following percentage of carbon
A. 0.20%
B. 0.80%
C. 1.30%
D. 2%
Question 175
Which of the following is an amorphous material?
A. Mica
B. Silver
C. Lead
D. Glass
Question 176
The alloying element which can replace tungsten in high speed steels is
A. Nickel
B. Vanadium
C. Cobalt
D. Molybdenum
Question 177
White cast iron has a high tensile strength and a low compressive strength.
A. Yes
B. No
Question 178
By severely deforming a metal in a particular direction it becomes
A. Ductile
B. Malleable
C. Homogeneous
D. Anisotropic
Question 179
The portion of the blast furnace below its widest cross-section is called
A. Hearth
B. Stack
C. Bosh
D. Throat
Question 180
The type of space lattice found in alpha-iron is
A. Face centered cubic space lattice
B. Body centered cubic space lattice
C. Close packed hexagonal space lattice
D. None of these
Question 181
Aluminium bronze contains
A. 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
B. 92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg
C. 10% aluminium and 90% copper
D. 90% magnesium and 9% aluminium with some copper
Question 182
Which of the following constituents of steels is softest and least strong?
A. Austenite
B. Pearlite
C. Ferrite
D. Cementite
Question 183
In a hardening process, the hypo-eutectoid steel is
A. Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air
B. Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
C. Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace
D. Heated below or closes to the lower critical temperature and then cooled slowly
Question 184
According to Indian standard specifications, SG 400/15 means
A. Spheroidal graphite cast iron with B.H.N. 400 and minimum tensile strength 15 MPa
B. Spheroidal graphite cast iron with minimum tensile strength 400 MPa and 15 percent elongation
C. Spheroidal graphite cast iron with minimum compressive strength 400 MPa and 15 percent reduction in area
D. None of the above
Question 185
Tungsten when added to steel __________ the critical temperature.
A. does not effect
B. lowers
C. raises
Question 186
Super conduction by metals is observed in the temperature range of
A. Below 10°K
B. Above 100°K
C. Around 0°C
D. Around 100°C
Question 187
The unit cells
A. Contain the smallest number of atoms which when taken together have all the properties of the crystals of the particular metal
B. Have the same orientation and their similar faces are parallel
C. May be defined as the smallest parallelepiped which could be transposed in three coordinate directions to build up the space lattice
D. All of the above
Question 188
Railway rails are normally made of
A. Mild steel
B. Alloy steel
C. High carbon
D. Tungsten steel
Question 189
The hardness and tensile strength in austenitic stainless steel can be increased by
A. Hardening and cold working
B. Normalizing
C. Martempering
D. Full annealing
Question 190
Brass is an alloy of
A. copper and zinc
B. copper and tin
C. copper, tin and zinc
D. none of these
Question 191
An engineer's hammer is made of
A. Cast iron
B. Forged steel
C. Mild steel
D. High carbon steel
Question 192
Steel contains
A. 80% or more iron
B. 50% or more iron
C. Alloying elements like chromium, tungsten nickel and copper
D. Elements like phosphorus, sulphur and silicon in varying quantities
Question 193
Large forgings, crank shafts, axles normally contain carbon up to
A. 0.05 to 0.20%
B. 0.20 to 0.45%
C. 0.45 to 0.55%
D. 0.55 to 1.0%
Question 194
The aluminium alloy made by melting aluminium with 2 to 10% magnesium and 1.75% copper is called
A. Duralumin
B. Y-alloy
C. Magnalium
D. Hindalium
Question 195
Bronze contains
A. 70% copper and 30% zinc
B. 90% copper and 10% tin
C. 85 - 92% copper and rest tin with little lead and nickel
D. 70 - 75% copper and rest tin
Question 196
The type of space lattice found in gamma-iron is
A. Face centered cubic space lattice
B. Body centered cubic space lattice
C. Close packed hexagonal space lattice
D. None of these
Question 197
The heat treatment process used for softening hardened steel is
A. Carburising
B. Normalizing
C. Annealing
D. Tempering
Question 198
Which of the following elements does not impart hardness to steel?
A. Copper
B. Chromium
C. Nickel
D. Silicon
Question 199
Chromium when added to steel _________ the tensile strength.
A. Does not effect
B. Decreases
C. Increases
D. None of these
Question 200
Addition of manganese to aluminium results in
A. Improvement of casting characteristics
B. Improvement of corrosion resistance
C. One of the best known age and precipitation hardening systems
D. Improving machinability
Question 201
Preheating is essential in welding
A. Cast iron
B. High speed steel
C. All nonferrous materials
D. All of the above
Question 202
Stress relaxation is the phenomenon
A. In which parts are not loaded
B. In which stress remains constant on increasing load
C. In which deformation tends to loosen the joint and produces a stress reduced
D. Stress reduces on increasing load
Question 203
Which is false statement about properties of aluminium?
A. Modulus of elasticity is fairly low
B. Wear resistance is very good
C. Fatigue strength is not high
D. Creep strength limits its use to fairly low temperatures
Question 204
Carbon steel is
A. Made by adding carbon in steel
B. Refined from cast iron
C. An alloy of iron and carbon with varying quantities of phosphorus and sulphur
D. Extensively used for making cutting tools
Question 205
The property of a material essential for spring materials is
A. Stiffness
B. Ductility
C. Resilience
D. Plasticity
Question 206
Nickel when added to copper improves
A. Machinability
B. Hardness
C. Hardness and strength
D. Strength and ductility
Question 207
The compressive strength of cast iron is __________that of its tensile strength.
A. Equal to
B. Less than
C. More than
D. None of these
Question 208
Malleability of a material can be defined as
A. Ability to undergo large permanent deformations in compression
B. Ability to recover its original form
C. Ability to undergo large permanent deformations in tension
D. All of the above
Question 209
In spheroidising process, the steel is
A. Heated below the lower critical temperature and then cooled slowly
B. Heated up to the lower critical temperature and then cooled in still air
C. Heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C
D. None of the above
Question 210
The silicon steel is widely used for
A. Connecting rods
B. Cutting tools
C. Generators and transformers in the form of laminated cores
D. Motor car crankshafts
Question 211
Iron-carbon alloys containing carbon ________ 4.3% are known as hyper-eutectic cast irons.
A. Equal to
B. Less than
C. More than
D. None of these
Question 212
Which of the following is added in low carbon steels to prevent them from becoming porous?
A. Sulphur
B. Phosphorus
C. Manganese
D. Silicon
Question 213
The loss of strength in compression with simultaneous gain in strength in tension due to overloading is known as
A. Hysteresis
B. Creep
C. Visco elasticity
D. Boeschinger effect
Question 214
The quenching of steel from the upper critical point results in a fine grained structure.
A. Agree
B. Disagree
Question 215
The hardness of steel depends upon the
A. Amount of cementite it contains
B. Amount of carbon it contains
C. Contents of alloying elements
D. Method of manufacture of steel
Question 216
Grey cast iron has
A. Carbon in the form of free graphite
B. High tensile strength
C. Low compressive strength
D. All of these
Question 217
White cast iron
A. Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron
B. Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
C. Is produced by annealing process. It is soft, tough and easily machined metal
D. Is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material
Question 218
A small percentage of boron is added to steel in order to
A. increase hardenability
B. reduce machinability
C. increase wear resistance
D. increase endurance strength
Question 219
In grey cast iron, carbon is present in the form of
A. Cementite
B. Free carbon
C. Flakes
D. Spheroids
Question 220
Cementite consist of
A. 13% carbon and 87% ferrite
B. 13% cementite and 87% ferrite
C. 13% ferrite and 87% cementite
D. 6.67% carbon and 93.33% iron
Question 221
German silver contains
A. 1% silver
B. 2% silver
C. 5% silver
D. No silver
Question 222
There are fourteen atoms in a unit cell of
A. Body centered cubic space lattice
B. Face centered cubic space lattice
C. Close packed hexagonal space lattice
D. None of these
Question 223
The transistor is made of
A. Silver
B. Gold
C. Copper
D. Germanium
Question 224
Which of the following metal is used in making electrical resistance wire for electric furnaces and heating elements?
A. Babbitt metal
B. Monel metal
C. Nichrome
D. Phosphor bronze
Question 225
The brown smoke during the operation of a Bessemer converter indicates that the
A. Air is burning out silicon and manganese
B. Silicon and manganese has burnt and carbon has started oxidizing
C. The converter must be titled to remove the contents of the converter
D. The brown smoke does not occur during the operation of a Bessemer converter
Question 226
Taps dies and drills contain carbon
A. Below 0.5%
B. Below 1%
C. Above 1%
D. Above 2.2%
Question 227
Weld decay is the phenomenon found with
A. Cast iron
B. Mild steel
C. Nonferrous materials
D. Stainless steel
Question 228
Iron-carbon alloys containing 1.7 to 4.3% carbon are known as
A. eutectic cast irons
B. hypo-eutectic cast irons
C. hyper-eutectic cast irons
D. none of these
Question 229
A specimen of aluminium metal when observed under microscope shows
A. B.C.C. crystalline structure
B. F.C.C. crystal structure
C. H.C.P. structure
D. A complex cubic structure
Question 230
Monel metal is an alloy of
A. Nickel and copper
B. Nickel and chromium
C. Nickel, Chromium and iron
D. Copper and chromium
Question 231
The elastic stress strain behavior of rubber is
A. Linear
B. Nonlinear
C. Plastic
D. No fixed relationship
Question 232
When low carbon steel is heated up to lower critical temperature
A. There is no change in grain size
B. The average grain size is a minimum
C. The grain size increases very rapidly
D. The grain size first increases and then decreases very rapidly
Question 233
Iron-carbon alloys containing 1.7 to 4.3% carbon are known as
A. Eutectic cast irons
B. Hypoeutectic cast irons
C. Hypereutectic cast irons
D. None of these
Question 234
Specify the sequence correctly
A. Grain growth, recrystallisation, stress relief
B. Stress relief, grain growth, recrystallisation
C. Stress relief, recrystallisation, grain growth
D. Grain growth, stress relief, recrystallisation
Question 235
The ratio of the volume occupied by the atoms to the total volume of the unit cell is called
A. Coordination number
B. Atomic packing factor
C. Space lattice
D. None of these
Question 236
In malleable iron, carbon is present in the form of
A. Cementite
B. Free carbon
C. Flakes
D. Nodular aggregates of graphite
Question 237
Ductility of a material can be defined as
A. Ability to undergo large permanent deformations in compression
B. Ability to recover its original form
C. Ability to undergo large permanent deformations in tension
D. All of the above
Question 238
White cast iron contains carbon in the form of
A. Free carbon
B. Graphite
C. Cementite
D. White carbon
Question 239
Hardness of steel depends on
A. Amount of carbon it contains
B. The shape and distribution of the carbides in iron
C. Method of fabrication
D. Contents of alloying elements
Question 240
Nimonic contains __________ percentage of nickel as that of Inconel.
A. same
B. less
C. more
Question 241
Tungsten in high speed steel provides
A. Hot hardness
B. Toughness
C. Wear resistance
D. Sharp cutting edge
Question 242
The main alloying elements high speed steel in order of increasing proportion are
A. Vanadium, chromium, tungsten
B. Tungsten, titanium, vanadium
C. Chromium, titanium, vanadium
D. Tungsten, chromium, titanium
Question 243
The correct sequence for descending order of machinability is
A. Grey cast iron, low carbon steel, wrought iron
B. Low carbon steel, grey cast iron, wrought iron
C. Wrought iron, low carbon steel, grey cast iron
D. Wrought iron, grey cast iron, low carbon steel
Question 244
Which is false statement about case hardening? Case hardening is done by
A. Electroplating
B. Cyaniding
C. Induction hardening
D. Nitriding
Question 245
Neutral solution is one which has pH value
A. Greater than 7
B. Less than 7
C. Equal to 7
D. pH value has nothing to do with neutral solution
Question 246
The stiffness is the ability of a material to resist
A. Deformation under stress
B. Fracture due to high impact loads
C. Externally applied forces with breakdown or yielding
D. None of the above
Question 247
Which is the false statement about wrought iron? It has
A. High resistance to rusting and corrosion
B. High ductility
C. Ability of hold protective coating
D. Uniform strength in all directions
Question 248
Which of the following impurity in cast iron promotes graphite nodule formation and increases the fluidity of the molten metal?
A. Silicon
B. Sulphur
C. Manganese
D. Phosphorus
Question 249
The hardness and tensile strength in austenitic stainless steel can be increased by
A. hardening and cold working
B. normalising
C. martempering
D. full annealing
Question 250
The percentage of carbon in grey iron castings usually varies between
A. 0.5 to 1%
B. 1.20%
C. 2.5 to 4.5%
D. 5 to 7%
Question 251
An important property of malleable cast iron in comparison to grey cast iron is the high
A. Compressive strength
B. Ductility
C. Carbon content
D. Hardness
Question 252
Wrought iron is
A. Hard
B. High in strength
C. Highly resistant to corrosion
D. Heat treated to change its properties
Question 253
Tungsten in steel
A. Improves wear resistance, cutting ability and toughness
B. Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
C. Improves cutting ability and reduces hardenability
D. Gives ductility, toughness, tensile strength and anti-corrosion properties
Question 254
The surface hardness of the following order is achieved by nitriding operation
A. 600 VPN
B. 1500 VPN
C. 1000 to 1100 VPN
D. 250 VPN
Question 255
Tungsten when added to steel __________ the critical temperature.
A. Does not effect
B. Lowers
C. Raises
D. None of these
Question 256
Inconel is an alloy of
A. Nickel, chromium and iron
B. Nickel, copper
C. Nickel, Chromium
D. Nickel, zinc
Question 257
Constantan an alloy used in thermocouples is an alloy of
A. Copper and tin
B. Copper and zinc
C. Copper and iron
D. Copper and nickel
Question 258
An alloy steel which is work hardenable and which is used to make the blades of bulldozers, bucket wheel excavators and other earth moving equipment contain iron, carbon and
A. chromium
B. silicon
C. manganese
D. magnesium
Question 259
In basic Bessemer process, the furnace is lined with
A. Silica bricks
B. A mixture of tar and burnt dolomite bricks
C. Both (A) and (B)
D. None of these
Question 260
Shock resisting steels should have
A. low wear resistance
B. low hardness
C. low tensile strength
D. toughness
Question 261
The defect which takes place due to imperfect packing of atoms during crystallization is known as
A. Line defect
B. Surface defect
C. Point defect
D. None of these
Question 262
Paramagnetic alpha iron changes to gamma iron at
A. 770°C
B. 910°C
C. 1440°C
D. 1539°C
Question 263
Cemented carbide tools are not found to be suitable for cutting
A. Brass
B. Cast iron
C. Aluminium
D. Steel
Question 264
Malleable cast iron is produced
A. by adding magnesium to molten cast iron
B. by quick cooling of molten cast iron
C. from white cast iron by annealing process
D. none of these
Question 265
The crystal structure of gamma iron is
A. Body centered cubic
B. Face centered cubic
C. Hexagonal close packed
D. Cubic structure
Question 266
The molecules in a solid move
A. In a random manner
B. In a haphazard way
C. In circular motion
D. Back and forth like tiny pendulums
Question 267
The bond formed by transferring electrons from one atom to another is called
A. Ionic bond
B. Covalent bond
C. Metallic bond
D. None of these
Question 268
Elinvar, an alloy used in precision instruments, hair springs for watches, etc. contains the following element as principal alloying element
A. Iron
B. Copper
C. Aluminium
D. Nickel
Question 269
The metallic structure of mild steel is
A. Body centered cubic
B. Face centered cubic
C. Hexagonal close packed
D. Cubic structure
Question 270
Balls for ball bearings are made of
A. Cast iron
B. Mild steel
C. Stainless steel
D. Carbon-chrome steel
Question 271
An eutectoid steel consists of
A. wholly pearlite
B. wholly austenite
C. pearlite and ferrite
D. pearlite and cementite
Question 272
Austenite is a combination of
A. Ferrite and cementite
B. Cementite and gamma iron
C. Ferrite and austenite
D. Ferrite and iron graphite
Question 273
When elements like nickel, chromium, copper and molybdenum are added to the molten cast iron, it produces
A. White cast iron
B. Nodular cast iron
C. Malleable cast iron
D. Alloy cast iron
Question 274
Which of the following iron exist between 910°C and 1403°C?
A. α-iron
B. β-iron
C. γ-iron
D. δ-iron
Question 275
Drop forging dies contain carbon of the order of
A. 0.1 to 0.2%
B. 0.25 to 0.5%
C. 0.6 to 0.7%
D. 0.7 to 0.9%
Question 276
The temperature required for full annealing in hypereutectoid steel is
A. 30° C to 50° C above upper critical temperature
B. 30° C to 50° C below upper critical temperature
C. 30° C to 50° C above lower critical temperature
D. 30° C to 50° C below lower critical temperature
Question 277
When medium carbon steel is heated to coarsening temperature
A. There is no change in grain size
B. The average grain size is a minimum
C. The grain size increases very rapidly
D. The grain size first increases and then decreases very rapidly
Question 278
Vanadium in high speed steels
A. Promotes decarburisation
B. Provides high hot hardness
C. Forms very hard carbides and thus increases wear resistance
D. Promotes retention of austenite
Question 279
Which of the following element results in presence of free graphite in C.I.?
A. Carbon
B. Sulphur
C. Silicon
D. Manganese
Question 280
The ability of a material to resist softening at high temperature is known as
A. Creep
B. Hot tempering
C. Hot hardness
D. Fatigue
Question 281
Hardness of lower bainite (tempered martensite) is about
A. RC 65
B. RC 48
C. RC 57
D. RC 80
Question 282
Compressive strength of grey cast iron in tonnes/cm is of the order of
A. 35
B. 57
C. 710
D. 1015
Question 283
Carbon in iron is an example of
A. Substitutional solution
B. Interstitial solid solution
C. Intermetallic compounds
D. All of the above
Question 284
Admiralty gun metal contains
A. 63 to 67% nickel and 30% copper
B. 88% copper, 10% tin and rest zinc
C. Alloy of tin, lead and cadmium
D. Iron scrap and zinc
Question 285
Sulphur in pig iron tends to make it
A. Hard
B. Soft
C. Ductile
D. Tough
Question 286
The blade of a power saw is made of
A. Boron steel
B. High speed steel
C. Stainless steel
D. Malleable cast iron
Question 287
Cupola produces following material
A. Cast iron
B. Pig iron
C. Wrought iron
D. Malleable iron
Question 288
The tensile strength of wrought iron is maximum
A. Along the lines of slag distribution
B. Perpendicular to lines of slag distribution
C. Uniform in all directions
D. None of the above
Question 289
Which of the following is not the correct method of increasing fatigue limit?
A. Shot peening
B. Nitriding of surface
C. Cold working
D. Surface decarburisation
Question 290
Argentite is the principal ore or raw material for
A. Aluminium
B. Tin
C. Zinc
D. Silver
Question 291
Babbitt metal is a
A. Lead base alloy
B. Copper base alloy
C. Tin base alloy
D. Cadmium base alloy
Question 292
Machining properties of steel are improved by adding
A. Sulphur, lead, phosphorous
B. Silicon, aluminium, titanium
C. Vanadium, aluminium
D. Chromium, nickel
Question 293
Chromium in steel
A. Improves wear resistance, cutting ability and toughness
B. Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
C. Improves cutting ability and reduces hardenability
D. Gives ductility, toughness, tensile strength and anti-corrosion properties
Question 294
Thermoplastic materials are those materials which
A. are formed into shape under heat and pressure and results in a permanently hard product
B. do not become hard with the application of heat and pressure and no chemical change occurs
C. are flexible and can withstand considerable wear under suitable conditions
D. are used as a friction lining for clutches and brakes
Question 295
The addition of which of the following improves machining of copper?
A. Sulphur
B. Vanadium
C. Tin
D. Zinc
Question 296
Hematite iron ore contains iron about
A. 30%
B. 45%
C. 55%
D. 70%
Question 297
Addition of copper to aluminium results in
A. Improvement of casting characteristics
B. Improvement of corrosion resistance
C. One of the best known age and precipitation hardening systems
D. Improving machinability
Question 298
The steel produced by bessemer or open hearth process is __________ to that produced by L-D process.
A. superior
B. inferior
Question 299
The charge of the blast furnace consists of
A. Calcined ore (8 parts), coke (4 parts) and limestone (1 part)
B. Calcined ore (4 parts), coke (1 part) and limestone (8 parts)
C. Calcined ore (1 part), coke (8 parts) and limestone (4 parts)
D. Calcined ore, coke and limestone all in equal parts
Question 300
Age-hardening is related with
A. Stainless steel
B. Gun metal
C. German silver
D. Duralumin
Question 301
Gamma iron exits at following temperature
A. Room temperature
B. Near melting point
C. Between 1400°C and 1539°C
D. Between 910°C and 1400°C
Question 302
An important property of high silicon (12-18%) cast iron is the high
A. Hardness
B. Brittleness
C. Plasticity
D. Ductility
Question 303
Beryllium bronze contains
A. 60% copper and 40% beryllium
B. 80% copper and 20% beryllium
C. 97.75% copper and 2.25% beryllium
D. 99% copper and 1% beryllium
Question 304
Annealing of white cast iron results in production of
A. Malleable iron
B. Nodular iron
C. Spheroidal iron
D. Grey iron
Question 305
When a steel containing __________ 0.8% carbon is cooled slowly below the lower critical point, it consists of ferrite and pearlite.
A. Equal to
B. Less than
C. More than
D. None of these
Question 306
The maximum internal diameter of a blast furnace is about
A. 3 m
B. 6 m
C. 9 m
D. 12 m
Question 307
Materials after cold working are subjected to following process to relieve stresses
A. Hot working
B. Tempering
C. Normalizing
D. Annealing
Question 308
Recrystallization temperature is one
A. At which crystals first start forming from molten metal when it is cooled
B. At which new spherical crystals first begin to form from the old deformed one when a strained metal is heated
C. At which change of allotropic form takes place
D. At which crystals grow bigger in size
Question 309
The hardness of steel increases if it contains
A. Austenite
B. Martensite
C. Pearlite
D. Cementite
Question 310
The machinability of steel is increased by
A. Silicon and sulphur
B. Phosphorous, lead and sulphur
C. Sulphur, graphite and aluminium
D. Phosphorous and aluminium
Question 311
Specify the sequence correctly
A. Grain growth, recrystallization, stress relief
B. Stress relief, grain growth, recrystallization
C. Stress relief, recrystallization, grain growth
D. Grain growth, stress relief, recrystallization
Question 312
Foundry crucible is made of
A. Mild steel
B. German silver
C. Lead
D. Graphite
Question 313
Cast iron has
A. High tensile strength
B. Its elastic limit close to the ultimate breaking strength
C. High ductility
D. All of the above
Question 314
German silver is an alloy of
A. Silver and some impurities
B. Refined silver
C. Nickel, Copper and zinc
D. Nickel and copper
Question 315
According to Indian standard specifications, plain carbon steel designated by 40 C8 means that the carbon content is
A. 0.04%
B. 0.35 to 0.45%
C. 0.4 to 0.6%
D. 0.6 to 0.8%
Question 316
A steel containing 16 to 18% chromium and about 0.12% carbon is called
A. Ferritic stainless steel
B. Austenitic stainless steel
C. Martenistic stainless steel
D. Nickel steel
Question 317
Sulphur in cast iron
A. Makes the iron soft and easily machinable
B. Increases hardness and brittleness
C. Make the iron white and hard
D. Aids fusibility and fluidity
Question 318
Induction hardening is the process of
A. Hardening surface of work-piece to obtain hard and wear resistant surface
B. Heating and cooling rapidly
C. Increasing hardness throughout
D. Inducing hardness by continuous process
Question 319
Steel containing ferrite and pearlite is
A. Hard
B. Soft
C. Tough
D. Hard and tough
Question 320
Grey cast iron
A. Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron
B. Is also known as chilled cast iron is obtained by cooling rapidly. It is almost unmachinable
C. Is produced by annealing process. I is soft, tough and easily machined metal
D. Is produced by small additions o magnesium (or cerium) in the ladle Graphite is in nodular or spheroidal form and is well dispersed throughout the material
Question 321
Which of the following display properties similar to that of steel?
A. Blackheart cast iron
B. Whiteheart cast iron
C. Both (A) and (B)
D. None of these
Question 322
Which of the following metal is used for nuclear energy?
A. Uranium
B. Thorium
C. Niobium
D. All of these
Question 323
Which one of the following metals would work-harden more quickly than the others?
A. Copper
B. Brass
C. Lead
D. Silver
Question 324
Surveying tapes are made of a material having low coefficient of expansion and enough strength. The alloy used is
A. Silver metal
B. Duralumin
C. Hastelloy
D. Invar
Question 325
Muntz metal contains copper and zinc in the ratio of
A. 50 : 50
B. 40 : 60
C. 60 : 40
D. 20 : 80
Question 326
Eutectoid steel contains following percentage of carbon
A. 0.02%
B. 0.30%
C. 0.63%
D. 0.80%
Question 327
Brass contains
A. 70% copper and 30% zinc
B. 90% copper and 10% tin
C. 85 - 92% copper and rest tin with little lead and nickel
D. 70 - 75% copper and rest tin
Question 328
Wrought iron
A. Is a ductile material
B. Can be easily forged or welded
C. Cannot stand sudden and excessive shocks
D. All of these
Question 329
Cold rolled steel sheets contain carbon of the following order
A. 0.10%
B. 0.20%
C. 0.40%
D. 0.60%
Question 330
Ferromagnetic alpha iron exists in temperature range of
A. Below 723°C
B. 770 to 910°C
C. 910 to 1440°C
D. 1400 to 1539°C
Question 331
The alloying element which reduces the formation of iron sulphide in steel is
A. Chromium
B. Nickel
C. Vanadium
D. Manganese
Question 332
Combined carbon in iron makes the metal
A. Soft and gives coarse grained crystalline structure
B. Soft and gives a fine grained crystalline structure
C. Hard and gives a coarse grained crystalline structure
D. Hard and gives a fine grained crystalline structure
Question 333
The coke in the charge of blast furnace
A. controls the grade of pig iron
B. acts as an iron-bearing mineral
C. supplies heat to reduce ore and melt the iron
D. forms a slag by combining with impurities
Question 334
In the lower part of the blast furnace (zone of fusion), the temperature is
A. 400° to 700°C
B. 800°C to 1000°C
C. 1200°C to 1300°C
D. 1500°C to 1700°C
Question 335
Shock resistance of steel is increased by adding
A. Nickel
B. Chromium
C. Nickel and chromium
D. Sulphur, lead and phosphorus
Question 336
The percentage of carbon in cast iron varies from
A. 0.1 to 0.5
B. 0.5 to 1
C. 1 to 1.7
D. 1.7 to 4.5
Question 337
Which is false statement about tempering? Tempering is done to
A. Improve machinability
B. Improve ductility
C. Improve toughness
D. Release stresses
Question 338
Haematite iron ore contains iron about
A. 30%
B. 45%
C. 55%
D. 70%
Question 339
Sulphur in steel
A. Acts as deoxidiser
B. Reduces the grain size
C. Decreases tensile strength and hardness
D. Lowers the toughness and transverse ductility
Question 340
When filing or machining cast iron makes our hands black, then it shows that ________ is present in cast iron.
A. Cementite
B. Free graphite
C. Both A and B
D. None of these
Question 341
Which of the following has highest specific strength of all structural materials?
A. Magnesium alloys
B. Titanium alloys
C. Chromium alloys
D. Magnetic steel alloys
Question 342
Following elements have face-centered cubic structure
A. Gamma iron (910° to 1400°C), Cu, Ag, Au, Al, Ni, Pb, Pt
B. Mg, Zn, Ti, Zr, Br, Cd
C. A iron (below 910°C and between 1400 to 1539°C), W
D. All of the above
Question 343
The most effective inhibitor of grain growth, when added in small quantities is
A. Carbon
B. Vanadium
C. Manganese
D. Cobalt
Question 344
Points of arrest for iron correspond to
A. Stages at which allotropic forms change
B. Stages at which further heating does not increase temperature for some time
C. Stages at which properties do not change with increase in temperature
D. There is nothing like points of arrest
Question 345
The usual composition of a soldering alloy is
A. Tin, lead and small percentage of antimony
B. Tin and lead
C. Tin, lead and silver
D. Tin and copper
Question 346
Which of the following material has nearly zero coefficient of expansion?
A. Stainless steel
B. High speed steel
C. Invar
D. Heat resisting steel
Question 347
The presence of hydrogen in steel causes
A. Reduced neutron absorption cross-section
B. Improved Weldability
C. Embrittlement
D. Corrosion resistance
Question 348
Bell metal contains
A. 70% copper and 30% zinc
B. 90% copper and 10% tin
C. 85 - 92% copper and rest tin with little lead and nickel
D. 70 - 75% copper and rest tin
Question 349
Corundum contains more than 95%
A. Steel
B. Al2O3
C. SiO2
D. MgO
Question 350
Cartridge brass can be
A. Cold rolled into sheets
B. Drawn into wires
C. Formed into tube
D. Any one of these
Question 351
Ferrite and pearlite makes the steel soft and ductile.
A. Agree
B. Disagree
Question 352
Induction hardening is basically a
A. Carburising process
B. Surface hardening process
C. Core hardening process
D. None of these
Question 353
The crystal of alpha iron is
A. Body centered cubic
B. Face centered cubic
C. Hexagonal close packed
D. Cubic structure
Question 354
Structural steel contains following principal alloying elements
A. Nickel, chromium and manganese
B. Tungsten, molybdenum and phosphorous
C. Lead, tin, aluminium
D. Zinc, sulphur, and chromium
Question 355
Gamma-iron occurs between the temperature ranges of
A. 400°C to 600°C
B. 600°C to 900°C
C. 900°C to 1400°C
D. 1400°C to 1530°C
Question 356
Process of Austempering results in
A. Formation of bainite structure
B. Carburised structure
C. Martenistic structure
D. Lamellar layers of carbide distributed throughout the structure
Question 357
The cupola is used to manufacture
A. pig iron
B. cast iron
C. wrought iron
D. steel
Question 358
The following types of materials are usually the most ductile
A. Face centered cubic lattice
B. Body centered cubic lattice
C. Hexagonal close packed lattice
D. All of the above
Question 359
Manganese is added in low carbon steel to
A. Make the steel tougher and harder
B. Raise the yield point
C. Make the steel ductile and of good bending qualities
D. All of the above
Question 360
Pick up wrong statement about wrought iron
A. It contains carbon of the order of 0 to 0.25%
B. It melts at 1535°C
C. It is very soft and ductile
D. It is made by adding suitable percentage of carbon to molten iron and subjecting the product to repeated hammering and rolling
Question 361
White metal contains
A. 63 to 67% nickel and 30% copper
B. 88% copper and 10% tin and rest zinc
C. Alloy of tin, lead and cadmium
D. Silver and chromium
Question 362
The purpose of heat treatment is to
A. Relieve the stresses set up in the material after hot or cold working
B. Modify the structure of the material
C. Change grain size
D. Any one of these
Question 363
Ball bearings are, usually, made from
A. Low carbon steel
B. High carbon steel
C. Medium carbon steel
D. Chrome steel
Question 364
The property of a material which enables it to retain the deformation permanently, is called
A. Brittleness
B. Ductility
C. Malleability
D. Plasticity
Question 365
Brass (alloy of copper and zinc) is an example of
A. Substitutional solid solution
B. Interstitial solid solution
C. Intermetallic compounds
D. All of the above
Question 366
Addition of silicon to aluminium results in
A. Improvement of casting characteristics
B. Improvement of corrosion resistance
C. One of the best known age and precipitation hardening systems
D. Improving machinability
Question 367
Which of the following material has maximum ductility?
A. Mild steel
B. Copper
C. Nickel
D. Aluminium
Question 368
Which of the following when used in ordinary low carbon steels, makes the metal ductile and of good bending qualities?
A. Sulphur
B. Phosphorus
C. Manganese
D. Silicon