Mechanical Engineering Materials (MEM)

ME3I

22343

Steel industry

Multiple Choice Questions (MCQs)

Pages –1/2

1   The product from blast furnace is called
    (A)   Cast iron
    (B)   Pig iron
    (C)   Steel
    (D)   Wrought iron
2   Malleability is the property by which a metal or an alloy can be plastically deformed by applying
    (A)   Tensile stress
    (B)   Bending stress
    (C)   Shear stress
    (D)   Compressive stress
3   For wire drawing operation, the work material should be
    (A)   Ductile
    (B)   Tough
    (C)   Malleable
    (D)   Resilient
4   Ductile iron is another name given to
    (A)   Nodular cast iron
    (B)   Malleable cast iron
    (C)   Grey cast iron
    (D)   White cast iron
5   Which is the closest to the purest form of iron?
    (A)   Cast iron
    (B)   Wrought iron
    (C)   Grey iron
    (D)   Mild steel
6   In grey cast iron, free graphite is in the form of
    (A)   Flakes
    (B)   Nodules
    (C)   Fine powder
    (D)   Spheroids
7   An increase in the percentage of carbon in steel results into decrease in its
    (A)   Hardness
    (B)   Ductility
    (C)   Ultimate strength
    (D)   Corrosion resistance
8   Mild steel belongs to the category of
    (A)   No carbon steel
    (B)   Low carbon steel
    (C)   High carbon steel
    (D)   Medium carbon steel
9   Eutectic reaction for iron-carbon system occurs at
    (A)   600 deg C
    (B)   723 deg C
    (C)   1147 deg C
    (D)   1493 deg C
10   In Iron carbon diagram, the x-axis represents
    (A)   Time
    (B)   Temperature
    (C)   Percentage of carbon
    (D)   Grain size
11   An allotropic material has
    (A)   Fixed structure at all temperatures
    (B)   Atoms distributed in random form
    (C)   Different crystal structures at different temperatures
    (D)   Fixed structure but random atom distribution
12   Carbon content is highest in
    (A)   Mild steel
    (B)   Eutectic steels
    (C)   Hypo-eutectic steels
    (D)   Hyper-eutectic steels
13   Identify the softest material out of the following
    (A)   Austenite
    (B)   Bainite
    (C)   Cementite
    (D)   Ferrite
14   Austenite is a solid solution of carbon in
    (A)   Alpha iron
    (B)   Beta iron
    (C)   Gamma iron
    (D)   Delta iron
15   Isothermal annealing is mainly used in alloy steels to improve
    (A)   Machinability
    (B)   Toughness
    (C)   Ductility
    (D)   Weldability
16   What is the purpose of hardening?
    (A)   Refine the structure
    (B)   Increase toughness
    (C)   Increase cutting ability
    (D)   Relieve stresses and strains
17   Which of the following structure has maximum hardness?
    (A)   Martensite
    (B)   Pearlite
    (C)   Sorbite
    (D)   Troostite
18   The fastest cooling rate is achieved when steel is quenched in
    (A)   air
    (B)   oil
    (C)   water
    (D)   brine
19   In normalizing, components are cooled _____
    (A)   using water
    (B)   using oil
    (C)   in still air
    (D)   in furnace
20   Martempering uses _______ quenching.
    (A)   water
    (B)   oil
    (C)   brine
    (D)   interrupted
21   In the austempering process of heat treatment, austenite changes into.
    (A)   martensite
    (B)   troostite
    (C)   sorbite
    (D)   bainite
22   Maximum surface hardness is attained by
    (A)   Cyaniding
    (B)   Carburizing
    (C)   Flame hardening
    (D)   Nitriding
23   In flame hardening the flame used is
    (A)   Oil burner
    (B)   Gas burner
    (C)   Oxy-acetylene
    (D)   Oxygen air
24   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
25   What is the carburizing temperature?
    (A)   150-250 deg C
    (B)   400-450 deg C
    (C)   650-700 deg C
    (D)   900-950deg C
26   Nitriding of steel is a process for
    (A)   Case hardening
    (B)   Spheroidising
    (C)   Normalizing
    (D)   Annealing
27   Steel when it contains more than 10 to 12% chromium becomes
    (A)   Alnico steel
    (B)   High speed steel
    (C)   Stainless steel
    (D)   Heat resistant steel
28   Metals possess —— nature
    (A)   Amorphous
    (B)   Crystalline
    (C)   Liquid
    (D)   Highly viscous
29   Atomic packing efficiency of BCC lattice is
    (A)   52%
    (B)   74%
    (C)   68%
    (D)   50%
30   —— is a building block of the crystal.
    (A)   Crystal
    (B)   Unit cell
    (C)   Multi cell
    (D)   None of the above
31   Which of the following is not a pure metal?
    (A)   Aluminium
    (B)   Copper
    (C)   Brass
    (D)   Silver
32   Which of the following is property of a ceramic material?
    (A)   Brittle
    (B)   Low density
    (C)   Both A and B
    (D)   Ductile
33   Following is the mixture of two or more different materials and they are mechanically or metallurgically bonded together
    (A)   Metals
    (B)   Ceramics
    (C)   Polymers
    (D)   Composites
34   How many numbers of atoms are present in the FCC unit lattice?
    (A)   3
    (B)   4
    (C)   5
    (D)   6
35   Amount of energy absorbed by the material before fracture is called
    (A)   Hardness
    (B)   Toughness
    (C)   Endurance limit
    (D)   Resilience
36   Stress / Strain =
    (A)   Youngs modulus
    (B)   Bulk modulus
    (C)   Modulus of rigidity
    (D)   Shear modulus
37   The property by which the material can be hammered into sheets is
    (A)   Elasticity
    (B)   Plasticity
    (C)   Viscosity
    (D)   Malleability
38   Failure of a machine component under repeated loading is called ——
    (A)   Creep
    (B)   Resilience
    (C)   Fatigue 
    (D)   Toughness
39   Which of the following is brittle material?
    (A)   Steel
    (B)   Copper
    (C)   Aluminium
    (D)   Cast iron
40   Creep is ——
    (A)   Time dependent
    (B)   Time independent
    (C)   Pressure dependent
    (D)   Temperature dependent
41   Which indenter is used for Brinell’s hardness test?
    (A)   Hardened steel ball
    (B)   Diamond ball
    (C)   Diamond prism
    (D)   Steel prism
42   In alloy a metal which is present in the largest proportion is called as
    (A)   Main metal
    (B)   Base metal
    (C)   Pure metal
    (D)   All of the above
43    A material is defined as
    (A)   Anything that occupies space and has mass
    (B)   Anything that has volume
    (C)   Both a and b
    (D)   None of this
44   Which of the following is not a ferrous alloy?
    (A)   Mild steel
    (B)   Alloy steel
    (C)   Cast iron
    (D)   Bronze
45   The property to undergo deformation under tension without fracture is known as —–
    (A)   Malleability
    (B)   Ductility
    (C)   Luster
    (D)   Toughness
46   The ability of metal to reflect light is known as —–
    (A)   Luster
    (B)   Ductility
    (C)   Malleability
    (D)   Toughness
47   Atomic packing efficiency of HCP is
    (A)   0.74
    (B)   0.68
    (C)   0.52
    (D)   0.48
48   Ability of material to withstand scratching is known as —–
    (A)   Creep
    (B)   Hardness
    (C)   Brittleness
    (D)   Toughness
49   Brass is 
    (A)   Solid solution
    (B)   Liquid solution
    (C)   Gas solution
    (D)   All of these
50   Carbon content is highest in 
    (A)   Mild steel 
    (B)   Eutectic steels
    (C)   Hypo-eutectic steels
    (D)   Hyper-eutectic steels
51   Identify the softest material out of the following
    (A)   Bainite
    (B)   Cementite
    (C)   Ferrite
    (D)   Pearlite
52   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
53   Which of the following is not an amorphous material?
    (A)   Glass
    (B)   Plastics
    (C)   Lead
    (D)   polymers
54   Amorphous solids have _______ structure
    (A)   Regular
    (B)   Linear
    (C)   Irregular
    (D)   Dendritic
55   The material in which the atoms are arranged chaotically, is called
    (A)   amorphous material
    (B)   mesomorphous material
    (C)   crystalline material
    (D)   none of these
56   There are fourteen atoms in a unit cell of
    (A)   BCC
    (B)   FCC
    (C)   HCP
    (D)   none of these
57   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
58   According to Hume Rothery’s rules, size of atoms must not differ by more than ________
    (A)   5%
    (B)   15%
    (C)   35%
    (D)   55%
59   Body centred 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
60   The atomic packing factor in a simple cubic unit cell is _______
    (A)   0.74
    (B)   0.52
    (C)   0.68
    (D)   0.66
61   What is the coordination number of a simple cubic (SC) unit cell?
    (A)   4
    (B)   6
    (C)   8
    (D)   2
62   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
63   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
64   Which one of the following is most symmetrical?
    (A)   Simple cubic cell
    (B)   Hexagonal
    (C)   Triclinic
    (D)   Tetragonal
65   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
66   Which of the following iron exist between 910° C and 1403° C?
    (A)   α-iron
    (B)   β-iron
    (C)   γ-iron
    (D)   δ-iron
67   The type of space lattice found in alpha-iron is
    (A)   face centred cubic space lattice
    (B)   body centred cubic space lattice
    (C)   close packed hexagonal space lattice
    (D)   none of these
68   At ________ iron changes its BCC structure to FCC.
    (A)   308°C
    (B)   568°C
    (C)   771°C
    (D)   906°C
69   The coordination number of a face centred cubic space lattice is
    (A)   six
    (B)   twelve
    (C)   eighteen
    (D)   twenty
70   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
71   Which of the following has a HCP crystal structure?
    (A)   W
    (B)   Mo
    (C)   Cr
    (D)   Zr
72   Lead is a metallic crystal having a _______ structure.
    (A)   FCC
    (B)   BCC
    (C)   HCP
    (D)   TCP
73   The metallic structure of mild steel is
    (A)   Body centered cubic
    (B)   Face centered cubic
    (C)   Hexagonal close packed
    (D)   Cubic structure
74   What is the coordination number of a simple cubic structure?
    (A)   6
    (B)   8
    (C)   10
    (D)   12
75   Coordination number for an ideal BCC metallic crystal is
    (A)   8
    (B)   6
    (C)   12
    (D)   Varies for different metal
76   What is the coordination number of a FCC structure?
    (A)   6
    (B)   8
    (C)   10
    (D)   12
77   The axial relationship of a monoclinic crystal system is given as ___________
    (A)   a = b = c
    (B)   a = b ≠ c
    (C)   a ≠ b = c
    (D)   a ≠ b ≠ c
78   The axial relationship of a rhombohedral crystal system is given as ___________
    (A)   a = b = c
    (B)   a = b ≠ c
    (C)   a ≠ b = c
    (D)   a ≠ b ≠ c
79   The interracial angles of a hexagonal crystal system are given by __________
    (A)   α = β = ϒ = 90  ̊
    (B)   α = β = 90  ̊  ϒ = 120  ̊
    (C)   α = β = ϒ ≠ 90  ̊
    (D)   α ≠ β ≠ ϒ ≠ 90  ̊
80   The interracial angles of a triclinic crystal system are given by __________
    (A)   α = β = ϒ = 90  ̊
    (B)   α = β = 90  ̊  ϒ = 120  ̊
    (C)   α = β = ϒ ≠ 90  ̊
    (D)   α ≠ β ≠ ϒ ≠ 90  ̊
81   Which of the following axis system is being satisfied by cubic crystal system?
    (A)   a = b = c, α = β = γ = 90  ̊ 
    (B)   a ≠ b = c, α = β = γ = 90  ̊ 
    (C)   a = b ≠ c, α = β = γ =90  ̊ 
    (D)   a = b = c, α ≠ β = ϒ =90  ̊ 
82   What is the atomic packing factor of simple cubic structure?
    (A)   0.52
    (B)   0.68
    (C)   0.74
    (D)   0.96
83   What is the atomic packing factor of FCC structure?
    (A)   0.52
    (B)   0.68
    (C)   0.74
    (D)   0.96
84   What is the atomic packing factor of BCC structure?
    (A)   0.54
    (B)   0.68
    (C)   0.74
    (D)   0.96
85   Substitution of a foreign atom in the site of parent atom in the crystal is a?
    (A)   Vacancy defect
    (B)   Substitution impurity
    (C)   Volume imperfection
    (D)   Line imperfections
86   Edge dislocation imperfection is a sub type of _____________
    (A)   Point imperfections
    (B)   Line imperfections
    (C)   Volume imperfections
    (D)   Surface imperfections
87   Vacancy defects in solids is a sub type of __________
    (A)   Point imperfections
    (B)   Line imperfections
    (C)   Volume imperfections
    (D)   Surface imperfections
88   Twin or Twinning is a category of ________
    (A)   Point imperfections
    (B)   Line imperfections
    (C)   Volume imperfections
    (D)   Surface imperfections
89   As the grain size of a metal increases, its strength ________
    (A)   Decreases
    (B)   Increases
    (C)   Remains constant
    (D)   No effect of grain size on strength
90   Phenomenon of cross slip occurs in ________
    (A)   Point imperfections
    (B)   Line imperfections
    (C)   Volume imperfections
    (D)   Surface imperfections
91   The imperfection in the crystal structure of metal is called
    (A)   Dislocation
    (B)   Slip
    (C)   Fracture
    (D)   Impurity
92   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
93   The defect which takes place due to imperfect packing of atoms during crystallisation is known as
    (A)   line defect
    (B)   surface defect
    (C)   point defect
    (D)   none of these
94   Up till which point will a body regain its original shape?
    (A)   Yield point
    (B)   Elastic limit
    (C)   Fracture limit
    (D)   Ultimate tensile strength point
95   Plasticity increases with temperature.
    (A)   TRUE
    (B)   FALSE
96   Which of the following is not an evidence of plastic action on the material?
    (A)   Yield
    (B)   Plastic flow
    (C)   Fatigue
    (D)   Creep
97   Which of the following is the property because of which a material can be drawn into wires?
    (A)   Ductility
    (B)   Elasticity
    (C)   Malleability
    (D)   Strength
98   What is the unit of impact strength?
    (A)   N/m
    (B)   MN/m
    (C)   MN/m2
    (D)   N/m2
99   Arrange the following in increasing order of hardness: talc, gypsum, topaz diamond.
    (A)   Talc, gypsum, topaz, diamond
    (B)   Gypsum, topaz, talc, diamond
    (C)   Diamond, topaz, talc, gypsum
    (D)   Topaz, gypsum, talc, diamond
100   How is brittleness related to impact strength?
    (A)   Brittleness is directly proportional to impact strength
    (B)   Brittleness is inversely proportional to impact strength
    (C)   Brittleness is directly proportional to a square of impact strength
    (D)   Brittleness is inversely proportional to a square of impact strength

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