Mechanical Engineering : Engineering Materials MCQs with Answers

1 .
Which of the following is a basic classification of Engineering Materials?
A)  Metals
B)  Non-Metals
C)  Both (A) and (B)
D)  None of the above

Correct Answer :   Both (A) and (B)

2 .
Which of the following is not a property of engineering materials?
A)  Polymorphism
B)  Chemical properties
C)  Mechanical properties
D)  Electrical properties

Correct Answer :   Polymorphism

Explanation : The various material properties are :

i) Mechanical properties
ii) Physical properties
iii) Electrical properties
iv) Chemical properties
v) Thermal properties
vi) Magnetic properties

3 .
Chromium when added to steel __________ the tensile strength.
A)  increases
B)  decreases
C)  does not effect
D)  None of the above

Correct Answer :   increases

4 .
Which of the following is added in low carbon steels to prevent them from becoming porous?
A)  Sulphur
B)  Silicon
C)  Manganese
D)  Phosphorus

Correct Answer :   Silicon

5 .
Specify the sequence correctly.
A)  Grain growth, stress relief, recrystallisation
B)  Grain growth, recrystallisation, stress relief
C)  Stress relief, grain growth, recrystallisation
D)  Stress relief, recrystallisation, grain growth

Correct Answer :   Stress relief, recrystallisation, grain growth

6 .
Thermoplastic materials are those materials which
A)  are used as a friction lining for clutches and brakes
B)  are flexible and can withstand considerable wear under suitable conditions
C)  are formed into shape under heat and pressure and results in a permanently hard product
D)  do not become hard with the application of heat and pressure and no chemical change occurs

Correct Answer :   do not become hard with the application of heat and pressure and no chemical change occurs

7 .
In the middle part of the blast furnace (zone of absorption), 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

Correct Answer :   800°C to 1000°C

8 .
The temperature in the upper part of the blast furnace (zone of reduction) is __________ that of the middle part.
A)  more than
B)  equal to
C)  less than
D)  None of the above

Correct Answer :   less than

9 .
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 the above

Correct Answer :   ionic bond

10 .
German silver contains
A)  1% silver
B)  2% silver
C)  5% silver
D)  no silver

Correct Answer :   no silver

11 .
Which of the following when used in ordinary low carbon steels, makes the metal ductile and of good bending qualities?
A)  Sulphur
B)  Manganese
C)  Silicon
D)  Phosphorus

Correct Answer :   Manganese

12 .
The hardness of steel depends upon the
A)  contents of alloying elements
B)  method of manufacture of steel
C)  amount of cementite it contains
D)  amount of carbon it contains

Correct Answer :   amount of carbon it contains

13 .
Which of the following is a case hardening process?
A)  Nitriding
B)  Cyaniding
C)  Carburising
D)  All of the above

Correct Answer :   All of the above

14 .
In a crystalline material, atoms are arranged in definite and orderly manner and form.
A)  Agree
B)  Disagree
C)  Both (A) and (B)
D)  Can not say

Correct Answer :   Agree

15 .
A steel with carbon __________ is known as hypo-eutectoid steel.
A)  0.8%
B)  below 0.8%
C)  above 0.8%
D)  None of the above

Correct Answer :   below 0.8%

16 .
Free cutting steels________.
A)  contain carbon in free from
B)  can be cut freely
C)  require minimum cutting force
D)  is used where rapid machining is the prime requirement

Correct Answer :   is used where rapid machining is the prime requirement

17 .
The presence of hydrogen in steel causes
A)  embrittlement
B)  corrosion resistance
C)  improved weldability
D)  reduced neutron absorption cross-section

Correct Answer :   embrittlement

18 .
Which of the following material has maximum ductility?
A)  Copper
B)  Nickel
C)  Mild steel
D)  Aluminium

Correct Answer :   Mild steel

19 .
An eutectoid steel consists of
A)  wholly pearlite
B)  wholly austenite
C)  pearlite and ferrite
D)  pearlite and cementite

Correct Answer :   wholly pearlite

20 .
The temperature point at which the change starts on heating the steel is called
A)  upper critical point
B)  lower critical point
C)  point of recalescence
D)  point of decalescence

Correct Answer :   lower critical point

21 .
Aluminium bronze has high resistance to corrosion.
A)  True
B)  False
C)  Can not say
D)  --

Correct Answer :   False

22 .
Manganese bronze contains more copper than silicon bronze.
A)  Yes
B)  No
C)  Can not say
D)  --

Correct Answer :   No

23 .
Which of the following is a type of Engineering Materials and is a Metal?
A)  Asbestos
B)  Ferrous Metals
C)  Non-Ferrous Metals
D)  Both (B) and (C)

Correct Answer :   Both (B) and (C)

Explanation : The engineering materials are classified as :

i) Ferrous Metals
ii) Non-ferrous Metals
iii) Plastics
iv) Ceramics and Diamond
v) Composite Materials
vi) Nano-materials

24 .
Which of the following attributes explain why pure metals are not frequently used in engineering applications?
A)  Luster
B)  Hardness
C)  Softness
D)  Brittleness

Correct Answer :   Softness

Explanation : Pure metals are soft and ductile, which is not ideal for most engineering applications. Therefore, alloys are used to fulfill the requirements. This explains why pure gold is mixed with impurities to make ornaments.

25 .
Connecting rod is, usually, made from
A)  medium carbon steel
B)  low carbon steel
C)  high speed steel
D)  high carbon steel

Correct Answer :   medium carbon steel

26 .
Which of the following inpurity in cast iron makes it hard and brittle?
A)  Silicon
B)  Sulphur
C)  Manganese
D)  Phosphorus

Correct Answer :   Sulphur

27 .
Cartidge brass can be________.
A)  drawn into wires
B)  formed into tube
C)  cold rolled into sheets
D)  Any one of these

Correct Answer :   Any one of these

28 .
Which of the following statement is correct?
A)  The cast iron has high tensile strength.
A)  
B)  The product produced by blastfurnace is called cast iron.
B)  
C)  The chilled cast iron has no graphite.
C)  
D)  The pig iron is the name given to the product produced by cupola.
D)  

Correct Answer :   The chilled cast iron has no graphite.

29 .
Blast furnace is used to produce
A)  pig iron
B)  steel
C)  cast iron
D)  wrought iron

Correct Answer :   pig iron

30 .
The austenitic stainless steel contains
A)  8% chromium and 18% nickel
B)  14% nickel and 0.35% carbon
C)  18% chromium and 8% nickel
D)  14% chromium and 0.35% carbon

Correct Answer :   18% chromium and 8% nickel

31 .
The process used for relieving the internal stresses previously set up in the Metal and for increasing the machinability of steel, is
A)  normalising
B)  spheroidising
C)  full annealing
D)  process annealing

Correct Answer :   process annealing

32 .
Steel containing upto 0.15% carbon, is known as
A)  mild steel
B)  dead mild steel
C)  high carbon steel
D)  medium carbon steel

Correct Answer :   dead mild steel

33 .
Tin base white metals are used where the bearings are subjected to
A)  elevated temperatures
B)  large surface wear
C)  high pressure and load
D)  light load and pressure

Correct Answer :   large surface wear

34 .
The charge of the blast furnace consists of
A)  calcined ore (8 parts ), coke (4 parts) and limestone (1 part)
B)  calcined ore (1 part), coke (8 part) and limestone (4 parts)
C)  calcined ore (4 parts), coke (1 part) and limestone (8 parts)
D)  calcined ore, coke and limestone all in equal parts

Correct Answer :   calcined ore (8 parts ), coke (4 parts) and limestone (1 part)

35 .
The ability of a material to resist fracture due to high impact loads, is called
A)  strength
B)  stiffness
C)  toughness
D)  brittleness

Correct Answer :   toughness

36 .
Shock resisting steels should have_______.
A)  toughness
B)  low hardness
C)  low wear resistance
D)  low tensile strength

Correct Answer :   toughness

37 .
Cast iron is a________.
A)  tough material
B)  ductile material
C)  malleable material
D)  brittle material

Correct Answer :   brittle material

38 .
The hardness is the property of a material due to which it________.
A)  can be drawn into wires
B)  can cut another metal
C)  breaks with little permanent distortion
D)  can be rolled or hammered into thin sheets

Correct Answer :   can cut another metal

39 .
Malleable cast iron is produced
A)  by quick cooling of molten cast iron
B)  by adding magnesium to molten cast iron
C)  from white cast iron by annealing process
D)  None of the above

Correct Answer :   from white cast iron by annealing process

40 .
In a face centred cubic space lattice, there are_________.
A)  hexagonal faces and three atoms are symmetrically arranged in the body of the cell
B)  fourteen atoms out of which eight atoms are located at the corners of the cube and six atoms at the centres of six faces
C)  nine atoms out of which eight atoms are located at the corners of the cube and one atom at its centre
D)  seventeen atoms out of which twelve atoms are located at the twelve corners of the hexagonal prism, one atom at the centre of each of the two

Correct Answer :   fourteen atoms out of which eight atoms are located at the corners of the cube and six atoms at the centres of six faces

41 .
The fuel used in a blast furnace is_____.
A)  coke
B)  wood
C)  coal
D)  producer gas

Correct Answer :   coke

42 .
Face centred cubic space lattice is found in gamma-iron, aluminium, copper, lead, silver and nickel.
A)  True
B)  False
C)  Both (A) and (B)
D)  Can not say

Correct Answer :   True

43 .
Which of the following is an example of a thermoplastic?
A)  Epoxide
B)  Urethane
C)  Melamine
D)  Acetal

Correct Answer :   Acetal

Explanation : Acetal is an example of engineering thermoplastics. These are the plastics that are typically employed in engineering applications due to high strength, environmental resistance, and physical properties. Other examples of engineering thermoplastics are ethenic, cellulose, polyether etc. Urethane, melamine, and epoxide are examples of engineering thermosetting plastics.

44 .
Which of the following class of engineering ceramics generally includes lubricant materials?
A)  Carbides
B)  Metalloids
C)  Sulphides
D)  Intermetallics

Correct Answer :   Sulphides

Explanation : Molybdenum disulfide (MoS2) and tungsten disulfide (WS2) are common sulfide materials used in lubrication. Metalloid elements like germanium and silicon are used as electronic devices. Intermetallics like Nickel aluminide are used in water coatings.

45 .
There are fourteen atoms in a unit cell of_____.
A)  body centred cubic space lattice
B)  face centred cubic space lattice
C)  close packed hexagonal space lattice
D)  None of the above

Correct Answer :   face centred cubic space lattice

46 .
The maximum internal diameter of a blast furnace is about
A)  3 m
B)  6 m
C)  9 m
D)  12 m

Correct Answer :   9 m

47 .
In spheroidising process, the steel is________.
A)  heated below the lower critical temperature and then cooled slowly
B)  heated upto 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

Correct Answer :   heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C

48 .
The percentage carbon content in wrought iron is about
A)  0.02
B)  0.1
C)  0.4
D)  0.6

Correct Answer :   0.02

49 .
The alloying element which reduces the formation of iron sulphide in steel is
A)  nickel
B)  vanadium
C)  chromium
D)  manganese

Correct Answer :   manganese

50 .
Which of the following statements are true for annealing of steels?
A)  Internal stresses are relieved
B)  Steels are heated to 500 to 700° C
C)  Cooling is done slowly and steadily
D)  All of the above

Correct Answer :   All of the above

51 .
The ability of a material to undergo large permanent deformation with the application of a tensile force, is called ductility.
A)  Correct
B)  Incorrect
C)  Both (A) and (B)
D)  Can not say

Correct Answer :   Correct

52 .
In a unit cell of a body centred cubic space lattice, there are __________ atoms.
A)  Six
B)  Nine
C)  Fourteen
D)  Seventeen

Correct Answer :   Nine

53 .
Cast iron has_______.
A)  excellent machinability
B)  high compressive strength
C)  good casting characteristic
D)  All of the above

Correct Answer :   All of the above

54 .
Silicon in cast iron________.
A)  aids fusibility and fluidity
B)  makes the iron white and hard
C)  makes the iron soft and easily machinable
D)  increases hardness and brittleness

Correct Answer :   makes the iron soft and easily machinable

55 .
The process which improves the machinability of steels, but lowers the hardness and tensile strength, is
A)  normalising
B)  full annealing
C)  spheroidising
D)  process annealing

Correct Answer :   spheroidising

56 .
The purpose of heat treatment is to______.
A)  change grain size
B)  modify the structure of the material
C)  relieve the stresses set up in the material after hot or cold working
D)  any one of these

Correct Answer :   any one of these

57 .
An alloy of copper, tin and zinc is known as______.
A)  gun metal
B)  brass
C)  bronze
D)  muntz metal

Correct Answer :   gun metal

58 .
Which of the following iron exist between 910° C and 1403° C?
A)  α-iron
B)  γ-iron
C)  β-iron
D)  δ-iron

Correct Answer :   γ-iron

59 .
The material in which the atoms are arranged chaotically, is called
A)  amorphous material
B)  crystalline material
C)  mesomorphous material
D)  None of the above

Correct Answer :   amorphous material

60 .
In basic bessemer process, the furnace is lined with
A)  silica bricks
B)  a mixture of tar and burnt dolomite bricks
C)  Either (A) or (B)
D)  None of the above

Correct Answer :   a mixture of tar and burnt dolomite bricks

61 .
Polyvinylchloride (PVC) is a __________ material.
A)  thermoplastic
B)  thermosetting
C)  Both (A) and (B)
D)  None of the above

Correct Answer :   thermoplastic

62 .
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 structuure due to hot working
D)  All of the above

Correct Answer :   All of the above

63 .
A steel containing 12 to 14% chromium and 0.12 to 0.35% carbon is called martensitic stainless steel.
A)  True
B)  False
C)  Can not say
D)  --

Correct Answer :   True

64 .
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)  All of the above

Correct Answer :   less than

65 .
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

Correct Answer :   1.7 to 4.5

66 .
The ability of a material to absorb energy in the plastic range is called
A)  creep
B)  resilience
C)  toughness
D)  fatigue strength

Correct Answer :   toughness

67 .
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

Correct Answer :   different crystal structures at different temperatures

68 .
The process in which carbon and nitrogen both are absorbed by the metal surface to get it hardened is known as
A)  cyaniding
B)  carburising
C)  flame hardening
D)  induction hardening

Correct Answer :   cyaniding

69 .
Muntz metal (Yellow brass) contains
A)  70% copper and 30% zinc
B)  60% copper and 40% zinc
C)  59% copper, 40% zinc and 1% tin
D)  60.45% copper, 35.2% zinc and 5.35% nickel

Correct Answer :   60% copper and 40% zinc

70 .
Which of the following gives the correct order of increasing hot hardness of cutting tool materials?
A)  High speed steel, Diamond, Carbide
B)  Carbide, Diamond, High speed steel
C)  Diamond, Carbide, High speed steel
D)  High speed steel, Carbide, Diamond

Correct Answer :   High speed steel, Carbide, Diamond

71 .
Which of the following is not a property of fiberglass?
A)  Organic
B)  Nonflammable
C)  Thermal insulation
D)  Reinforcement for plastics

Correct Answer :   Organic

Explanation : Fiberglass is known as the glass that has been drawn into fine fibers. They are inorganic in nature which makes them greatly inert. They also exhibit a high strength to weight ratio, non-flammability, and resistance to heat. For engineering applications, they are used for thermal and acoustic insulation, and as reinforcements for plastics.

72 .
On average, what is the maximum use temperature of engineering ceramics?
A)  2760oC
B)  2860oC
C)  3400oC
D)  6815oC

Correct Answer :   2760oC

Explanation : Compared to most metals and plastics, ceramics have a very good limit of maximum use temperature. It lies around 2760oC for ceramics, while metals and plastics lay lower at 815oC and 260oC respectively.

73 .
How is the creep strength of ceramics when compared to other materials?
A)  Low
B)  High
C)  Excellent
D)  Zero

Correct Answer :   Excellent

Explanation : Engineering ceramics have good tensile strength, compressive strength, hardness, and excellent creep resistance. Metals usually have gold creep resistance, but plastics fair poorly.

74 .
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

Correct Answer :   there is only one critical point

75 .
In high speed steels, manganese is used to tougher the metal and to increase its
A)  hardness
B)  yield point
C)  melting point
D)  critical temperature

Correct Answer :   critical temperature

76 .
18-4-1 high speed steel contains_______.
A)  vanadium 1%, chromium 4% and tungsten 18%
B)  vanadium 4%, chromium 18% and tungsten 1%
C)  vanadium 18%, chromium 1% and tungsten 4%
D)  None of the above

Correct Answer :   vanadium 1%, chromium 4% and tungsten 18%

77 .
Which of the following statement is true about brittle fracture?
A)  Brittle fracture is always preceded by noise
B)  High temperature and low strain rates favour brittle fracture
C)  Cup and cone formation is characteristic for brittle materials
D)  Many metals with hexagonal close packed (H.C.P) crystal structure commonly show brittle fracture

Correct Answer :   Many metals with hexagonal close packed (H.C.P) crystal structure commonly show brittle fracture

78 .
Grey cast iron has________.
A)  high tensile strength
B)  low compressive strength
C)  carbon in the form of free graphite
D)  All of the above

Correct Answer :   carbon in the form of free graphite

79 .
Induction hardening is basically a________.
A)  carburising process
B)  surface hardening process
C)  core-hardening process
D)  None of the above

Correct Answer :   surface hardening process

80 .
Which of the following iron exists at 910° C?
A)  α-iron
B)  β-iron
C)  δ-iron
D)  γ-iron

Correct Answer :   α-iron

81 .
The iron ore mostly used for the production of pig iron is
A)  limonite
B)  haematite
C)  siderite
D)  magnetite

Correct Answer :   haematite

82 .
A carbon steel having Brinell hardness number 100 should have ultimate tensile strength closer to
A)  100 N/mm²
B)  200 N/mm²
C)  350 N/mm²
D)  1000 N/mm²

Correct Answer :   350 N/mm²

83 .
The steel widely used for making precision measuring instruments is
A)  high speed steel
B)  nickel-chrome steel
C)  nickel steel
D)  chrome-vanadium steel

Correct Answer :   nickel steel

84 .
The ductility is the property of a material due to which it_______.
A)  can be drawn into wires
B)  breaks with little permanent distortion
C)  can be rolled or hammered into thin sheets
D)  can resist fracture due to high impact loads

Correct Answer :   can be drawn into wires

85 .
Shock resistance of steel is increased by adding
A)  nickel
B)  chromium
C)  nickel and chromium
D)  sulphur, lead and phosphorus

Correct Answer :   nickel and chromium

86 .
In low carbon steels, __________ raises the yield point and improves the resistance to atmospheric corrosion.
A)  silicon
B)  sulphur
C)  manganese
D)  phosphorus

Correct Answer :   phosphorus

87 .
A steel containing 16 to 18% chromium and about 0.12% carbon is called
A)  austenitic stainless steel
B)  ferritic stainless steel
C)  nickel steel
D)  martensitic stainless steel

Correct Answer :   ferritic stainless steel

88 .
The alloy, mainly used for corrosion resistance in stainless steels is
A)  silicon
B)  chromium
C)  carbon
D)  manganese

Correct Answer :   chromium

89 .
Closed packed hexagonal space lattice is found in
A)  alpha-iron, tungsten, chromium and molybdenum
B)  gamma-iron, aluminium, copper, lead, silver and nickel
C)  zinc, magnesium, cobalt, cadmium, antimony and bismuth
D)  None of the above

Correct Answer :   zinc, magnesium, cobalt, cadmium, antimony and bismuth

90 .
The hardness and tensile strength in austenitic stainless steel can be increased by
A)  normalising
B)  martempering
C)  full annealing
D)  hardening and cold working

Correct Answer :   hardening and cold working

91 .
The temperature required for full annealing in hyper-eutectoid steel is
A)  30° C to 50° C above lower critical temperature
B)  30° C to 50° C below lower critical temperature
C)  30° C to 50° C below upper critical temperature
D)  30° C to 50° C above upper critical temperature

Correct Answer :   30° C to 50° C above lower critical temperature

92 .
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)  silicon
B)  manganese
C)  chromium
D)  magnesium

Correct Answer :   manganese

93 .
Which of the following has a fine gold colour and is used for imitation jewellery?
A)  Gun metal
B)  Babbit metal
C)  Aluminium bronze
D)  Silicon bronze

Correct Answer :   Aluminium bronze

94 .
When the steel is normalised, its________.
A)  ductility decreases
B)  yield point increases
C)  ultimate tensile strength increases
D)  All of the above

Correct Answer :   All of the above

95 .
The slag from the blast furnace______.
A)  is mixed with tar for road making
B)  is used as a ballast for rail road
C)  consists of calcium, aluminium and ferrous silicates
D)  All of the above

Correct Answer :   All of the above

96 .
Which of the following is a mesomorphous material?
A)  Mica
B)  Lead
C)  Brass
D)  Silver

Correct Answer :   Mica

97 .
Which of the following factors affect the mechanical properties of a material under applied loads?
A)  Grain size
B)  Shape of material
C)  Content of alloys
D)  Imperfection and defects

Correct Answer :   Shape of material

Explanation : Contents of alloys improve or decrease the hardness and strength of materials. Finer grain sizes improve the strength of the material. Imperfection and defects reduce the strength of the material. Shape, however, has little or no effect on the material.

98 .
On which of the following materials the compressive test is done?
A)  Gold
B)  Aluminum
C)  Cast iron
D)  Thermocole

Correct Answer :   Cast iron

Explanation : Since brittle materials are unsuitable for tension test, they are checked using a compressive test. Brittle materials such as cast iron, concrete, mortar, brick, and ceramics are commonly tested in compression.

99 .
Which of the following term is used to define the temperature at which a substance changes its status from solid to liquid?
A)  Boiling point
B)  Melting point
C)  Freezing point
D)  Condensation point

Correct Answer :   Melting point

Explanation : The temperature at which a substance changes from solid state to liquid is known as the melting point; here the temperatures of solid and liquid are in equilibrium. The shift of liquid state to solid is known as the freezing point. The transition from gaseous state to liquid is known as condensation, while that of liquid to gaseous is known as the boiling point.

100 .
The machinability of aluminium increases when __________ is added to aluminium.
A)  copper
B)  silicon
C)  magnesium
D)  lead and bismuth

Correct Answer :   lead and bismuth

101 .
Body centred cubic space lattice is found in______.
A)  alpha-iron, tungsten, chromium and molybdenum
B)  gamma-iron, aluminium, copper, lead, silver and nickel
C)  zinc, magnesinm, cobalt, cadmium, antimony and bismuth
D)  None of the above

Correct Answer :   alpha-iron, tungsten, chromium and molybdenum

102 .
When a low carbon steel is heated upto 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

Correct Answer :   there is no change in grain size

103 .
Grey cast iron is __________ than white cast iron.
A)  harder
B)  softer
C)  Both (A) and (B)
D)  Can not say

Correct Answer :   softer

104 .
The silicon steel is widely used for________.
A)  cutting tools
B)  connecting rods
C)  motor car crankshafts
D)  generators and transformers in the form of laminated cores

Correct Answer :   generators and transformers in the form of laminated cores

105 .
Ball bearings are, usually, made from
A)  low carbon steel
B)  medium carbon steel
C)  chrome steel
D)  high carbon steel

Correct Answer :   chrome steel

106 .
Macro-structure of a material is, generally, examined by
A)  naked eye
B)  X-ray techniques
C)  optical microscope
D)  metallurgical microscope

Correct Answer :   naked eye

107 .
When elements like nickel, chromium, copper and molybdenum are added to the molten cast iron, it produces
A)  white cast iron
B)  alloy cast iron
C)  nodular cast iron
D)  malleable cast iron

Correct Answer :   alloy cast iron

108 .
The strength 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

Correct Answer :   externally applied forces with breakdown or yielding

109 .
The material widely used for making pendulums of clocks is
A)  stainless steel
B)  nickel steel
C)  high speed steel
D)  heat resisting steel

Correct Answer :   nickel steel

110 .
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

Correct Answer :   deformation under stress

111 .
The essential constituent of a hardened steel is______.
A)  pearlite
B)  austenite
C)  troostite
D)  martensite

Correct Answer :   martensite

112 .
The cutting tools are made from
A)  chrome steel
B)  nickel steel
C)  high speed steel
D)  nickel-chrome steel

Correct Answer :   high speed steel

113 .
The approximate height of a blast furnace is
A)  10 m
B)  20 m
C)  30 m
D)  40 m

Correct Answer :   30 m

114 .
A steel alloy containing 36% nickel is called
A)  invar
B)  stainless steel
C)  high speed steel
D)  heat resisting steel

Correct Answer :   invar

115 .
The addition of manganese to aluminium improves corrosion resistance.
A)  Correct
B)  Incorrect
C)  Can not say
D)  --

Correct Answer :   Correct

116 .
The temperature point at which the change ends on heating the steel is called
A)  lower critical point
B)  upper critical point
C)  point of recalescence
D)  point of decalescence

Correct Answer :   upper critical point

117 .
Which of the following metal shrinks most from molten state to solid state?
A)  Brass
B)  Cast iron
C)  Cast steel
D)  Admirality metal

Correct Answer :   Admirality metal

118 .
A steel containing ferrite and pearlite is
A)  hard
B)  tough
C)  soft
D)  hard and tough

Correct Answer :   soft

119 .
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 the above

Correct Answer :   point defect

120 .
A coarse grained steel
A)  is less tough and has a greater tendency to distort during heat treatment
B)  is less tough and has a less tendency to distort during heat treatment
C)  is more ductile and has a less tendency to distort during heat treatment
D)  is more ductile and has a greater tendency to distort during heat treatment

Correct Answer :   is less tough and has a greater tendency to distort during heat treatment

121 .
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)  4 to 4.5% magnesium, 3 to 4% copper and rest aluminium
C)  5 to 6% tin, 2 to 3% copper and rest aluminium
D)  3.5 to 4.5% copper, 1.2 to 1.7% managanese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium

Correct Answer :   3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium

122 .
Age hardening is related to
A)  brass
B)  silver
C)  copper
D)  duralumin

Correct Answer :   duralumin

123 .
The addition of which of the following improves machining of copper?
A)  Tin
B)  Zinc
C)  Sulphur
D)  Vanadium

Correct Answer :   Sulphur

124 .
When a medium carbon steel is heated to coarsening temperature,
A)  there is no change in grain size
B)  the grain size increases very rapidly
C)  the average grain size is a minimum
D)  the grain size first increases and then decreases very rapidly

Correct Answer :   the grain size increases very rapidly

125 .
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 below or close to the lower critical temperature and then cooled slowly
C)  heated from 30° C to 50° C above the upper critical temperature and then cooled slowly in the furnace
D)  heated from 30° C to 50° C above the upper critical temperature and then cooled suddenly in a suitable cooling medium

Correct Answer :   heated below or close to the lower critical temperature and then cooled slowly

126 .
Dye penetrant method is generally used to locate
A)  surface defects
B)  core defects
C)  temporary defects
D)  superficial defects

Correct Answer :   surface defects

127 .
The charge is fed into the blast furnace through the
A)  bosh
B)  stack
C)  throat
D)  tuyers

Correct Answer :   throat

128 .
A small percentage of boron is added to steel in order to
A)  reduce machinability
B)  increase wear resistance
C)  increase endurance strength
D)  increase hardenability

Correct Answer :   increase hardenability

129 .
The casting ability of aluminium increases when __________ is added to aluminium.
A)  copper
B)  silicon
C)  magnesium
D)  lead and bismuth

Correct Answer :   silicon

130 .
Manganese bronze has
A)  high resistance to corrosion
B)  valuable cold working property
C)  good wearing qualities and high elasticity
D)  high yield point, high fatigue limit and excellent cold and hot corrosion resistance

Correct Answer :   high resistance to corrosion

131 .
A steel is heated at about 875° C where the structure consists of entirely austenite. It is then cooled suddenly at a temperature of about 250° C to 525° C. This process of heat treatment is known as
A)  annealing
A)  
B)  normalising
B)  
C)  austempering
C)  
D)  martempering
D)  

Correct Answer :   austempering

132 .
Which of the following materials are usually used for Electrolysis?
A)  Zinc, cadmium
B)  Silver, tin
C)  Aluminum, nickel
D)  Silicon, antimony

Correct Answer :   Silver, tin

Explanation : Since atomization results in oxidation of molten metal as it comes in contact with air, it is only used for materials like zinc and cadmium. Electrolysis is a standard electrolytic process which is used for materials like silver and tin. It is advantageous as it produces oxidation resistant powders.

133 .
Which of the following processes is not an application of thermoelectric effect?
A)  Seebeck effect
B)  Thomson effect
C)  Peltier effect
D)  Ettingshausen effect

Correct Answer :   Ettingshausen effect

Explanation : Seebeck, Peltier, and Thomson are three distinct effects which make up the thermoelectric effect. Ettingshausen effect, however, is a separate thermoelectric phenomenon like the Nernst effect.

134 .
Which of the following materials are to be tested using an F-scale?
A)  Thermoplastics
B)  Case hardened steels
C)  Copper and brass
D)  Bronze, gunmetal, and beryllium copper

Correct Answer :   Copper and brass

Explanation : The Rockwell hardness F-scale uses a 1/16 inch diameter steel ball indenter with a total indenting load of 60 kg. This is used for testing of copper and brass.

135 .
Which of the following property is desirable for materials used in tools and machines?
A)  Ductility
B)  Plasticity
C)  Elasticity
D)  Malleability

Correct Answer :   Elasticity

136 .
Babbit metal is a________.
A)  tin-base alloy
B)  lead-base alloy
C)  copper-base alloy
D)  cadmium-base alloy

Correct Answer :   tin-base alloy

137 .
The metal suitable for bearings subjected to heavy loads, is
A)  monel metal
B)  white metal
C)  silicon bronze
D)  phosphor bronze

Correct Answer :   white metal

138 .
The compressive strength of cast iron is __________ that of its tensile strength.
A)  more than
B)  less than
C)  equal to
D)  Can not say

Correct Answer :   more than

139 .
When a steel containing less than 0.8% carbon is cooled slowly from temperatures above or within the critical range, it consists of
A)  mainly pearlite
B)  mainly ferrite
C)  pearlite and cementite
D)  ferrite and pearlite

Correct Answer :   ferrite and pearlite

140 .
Eutectoid reaction occurs at
A)  600°C
B)  723°C
C)  1147°C
D)  1493°C

Correct Answer :   723°C

141 .
Nickel when added to copper improves
A)  hardness
B)  machinability
C)  hardness and strength
D)  strength and ductility

Correct Answer :   hardness

142 .
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

Correct Answer :   1200°C to 1300°C

143 .
Which of the following impurity in cast iron promotes graphite nodule formation and increases the fluidity of the molten metal?
A)  Sulphur
B)  Silicon
C)  Manganese
D)  Phosphorus

Correct Answer :   Sulphur

144 .
The blade of a power saw is made of
A)  boron steel
B)  stainless steel
C)  malleable cast iron
D)  high speed steel

Correct Answer :   high speed steel

145 .
In induction hardening _______ is high.
A)  voltage
B)  frequency
C)  current
D)  temperature

Correct Answer :   frequency

146 .
The metal suitable for bearings subjected to light loads, is_______.
A)  white metal
B)  monel metal
C)  phosphor bronze
D)  silicon bronze

Correct Answer :   phosphor bronze

147 .
The property of a material essential for spring materials is_______.
A)  stiffness
B)  resilience
C)  ductility
D)  plasticity

Correct Answer :   resilience

148 .
Which of the following material has nearly zero coefficient of expansion?
A)  Invar
B)  Stainless steel
C)  High speed steel
D)  Heat resisting steel

Correct Answer :   Invar

149 .
The process of inducing carbon to __________ carbon steels in order to give it a hard surface is known as carburising.
A)  low
B)  medium
C)  high
D)  None of the above

Correct Answer :   low

150 .
Which of the following solids are malleable and ductile?
A)  Ionic solids
B)  Covalent solids
C)  Both (A) and (B)
D)  Metallic solids

Correct Answer :   Metallic solids

151 .
Thermosetting plastics are those materials which________.
A)  are used as a friction lining for clutches and brakes
B)  are flexible and can withstand considerable wear under suitable conditions
C)  are formed into shape under heat and pressure and results in a permanently hard product
D)  do not become hard with the application of heat and pressure and no chemical change occurs

Correct Answer :   are formed into shape under heat and pressure and results in a permanently hard product

152 .
Admirality gun metal contains________.
A)  76% copper, 20% silicon and 4% zinc
B)  88% copper, 10% tin and 2% zinc
C)  60% copper, 35% zinc and 5% manganese
D)  82% copper, 12% zinc and 6% manganese

Correct Answer :   88% copper, 10% tin and 2% zinc

153 .
The percentage of phosphorus is phosphor bronze is
A)  0.1
B)  1
C)  11.1
D)  98

Correct Answer :   0.1

154 .
For the pipe fitting like elbow, tee, union etc., which of the following is preferred?
A)  Pig iron
B)  Malleable iron
C)  High carbon steel
D)  Spheroidal graphite cast iron

Correct Answer :   Malleable iron

155 .
Chilled cast iron is produced_________.
A)  by adding magnesium to molten cast iron
B)  from white cast iron by annealing process
C)  Both (A) and (B)
D)  by quick cooling of molten cast iron

Correct Answer :   by quick cooling of molten cast iron

156 .
Silicon is added in low carbon steels to
A)  raise the yield point
B)  make the steel of good bending qualities
C)  make the steel tougher and harder
D)  All of the above

Correct Answer :   make the steel tougher and harder

157 .
According to Indian standard specifications, cast iron designated by 'FG 150' means
A)  grey cast iron with B.H.N. 150
B)  white cast iron with B.H.N. 150
C)  grey cast iron with 150 MPa as minimum tensile strength
D)  white cast iron with 150 MPa as minimum compressive strength

Correct Answer :   grey cast iron with 150 MPa as minimum tensile strength

158 .
Delta-iron occurs between the temperature range of
A)  1400°C to 1530°C
B)  900°C to 1400°C
C)  600°C to 900°C
D)  400°C to 600°C

Correct Answer :   1400°C to 1530°C

159 .
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

Correct Answer :   spheroidal graphite cast iron with minimum tensile strength 400 MPa and 15 percent elongation

160 .
White cast iron has__________.
A)  low tensile strength
B)  high compressive strength
C)  carbon in the form of carbide
D)  All of the above

Correct Answer :   All of the above

161 .
Iron-carbon alloys containing carbon __________ 4.3% are known as hyper-eutectic cast irons.
A)  less than
B)  equal to
C)  more than
D)  Can not say

Correct Answer :   more than

162 .
In low carbon steels, presence of small quantities of sulphur improves
A)  formability
B)  machinability
C)  weldability
D)  hardenability

Correct Answer :   machinability

163 .
The aluminium alloy made by melting aluminium with 2 to 10% magnesium and 1.75% copper is called
A)  magnalium
B)  Y-alloy
C)  duralumin
D)  hindalium

Correct Answer :   magnalium

164 .
Which of the following process of steel making is in operation at Tata Iron and Steel Works, Jamshedpur?
A)  Duplex process
B)  Bessemer process
C)  Electric process
D)  Open hearth process

Correct Answer :   Duplex process

165 .
The unit cells________
A)  have the same orientation and their similar faces are parallel
B)  contain the smallest number of atoms which when taken together have all the properties of the crystals of the particular metal
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

Correct Answer :   All of the above

166 .
Tungsten when added to steel __________ the critical temperature.
A)  lowers
B)  does not effect
C)  raises
D)  Can not say

Correct Answer :   raises

167 .
Silicon when added to copper improves
A)  hardness
B)  hardness and strength
C)  machinability
D)  strength and ductility

Correct Answer :   hardness and strength

168 .
The alloying element which increases residual magnetism and coercive magnetic force in steel for magnets is
A)  nickel
B)  cobalt
C)  vanadium
D)  chromium

Correct Answer :   cobalt

169 .
The lower critical point for all steels is
A)  600°C
B)  700°C
C)  723°C
D)  913°C

Correct Answer :   723°C

170 .
Cast iron is manufactured in_________.
A)  cupola
B)  blast furnace
C)  bessemer converter
D)  open hearth furnace

Correct Answer :   cupola

171 .
Haematite iron ore contains iron about
A)  30%
B)  45%
C)  55%
D)  70%

Correct Answer :   70%

172 .
Silicon bronze contains________.
A)  60% copper, 35% zinc and 5% manganese
B)  76% copper, 20% silicon and 4% zinc
C)  88% copper, 10% tin and 2% zinc
D)  96% copper, 3% silicon and 1% manganese

Correct Answer :   96% copper, 3% silicon and 1% manganese

173 .
In acidic bessemer process, the furnace is lined with
A)  silica bricks
B)  a mixture of tar and burnt dolomite bricks
C)  Either (A) or (B)
D)  None of the above

Correct Answer :   silica bricks

174 .
The malleability is the property of a material by virtue of which a material
A)  retains the deformation produced under load permanently
B)  can be rolled or hammered into thin sheets
C)  regains its shape and size after the removal of external forces
D)  can be drawn into wires with the application of a tensile force

Correct Answer :   can be rolled or hammered into thin sheets

175 .
Duplex process of steel making is a combination of
A)  acid bessemer and acid open hearth processes
B)  acid bessemer and basic open hearth processes
C)  basic bessemer and acid open hearth processes
D)  basic bessemer and basic open hearth processes

Correct Answer :   acid bessemer and basic open hearth processes

176 .
Steel containing 0.8 to 1.5% carbon, is known as
A)  mild steel
B)  dead mild steel
C)  high carbon steel
D)  medium carbon steel

Correct Answer :   high carbon steel

177 .
The property of a material necessary for forgings, in stamping images on coins and in ornamental work, is
A)  ductility
B)  elasticity
C)  malleability
D)  plasticity

Correct Answer :   plasticity

178 .
The portion of the blast furnace above its widest cross-section is called
A)  stack
B)  bosh
C)  throat
D)  hearth

Correct Answer :   stack

179 .
The heat treatment process used for castings is
A)  annealing
B)  tempering
C)  normalising
D)  carburising

Correct Answer :   normalising

180 .
Which of these is not a function of alloy steels?
A)  Improves ductility
B)  Reduces cost
C)  Increases strength
D)  Improves machinability

Correct Answer :   Reduces cost

Explanation : Alloy steels are used to improve properties such as strength, hardness, ductility, grain structure, and machinability, among others. This, however, results in increased costs due to multiple elements involved in the process.

181 .
How does the Vicker's hardness test differ from Brinell's?
A)  Load applied
B)  Type of indenter
C)  Materials to be tested
D)  Duration of indentation

Correct Answer :   Type of indenter

Explanation : Similar to Brinell’s test, Vicker’s test also employs forcing of the indenter into the surface of metal for about 10-15 seconds. However, instead of a ball indenter, a pyramid-shaped indenter is used. This test is commonly also called the diamond-pyramid hardness test.

182 .
Which of the following is a characteristic of alumina?
A)  Good toughness
B)  Poor wear resistance
C)  Good tensile strength
D)  Excellent hardness

Correct Answer :   Excellent hardness

Explanation : Aluminum oxide (Al2O3) is regarded as the oldest engineering ceramic. They have excellent hardness and wear resistance. They are stiffer and stronger than steels. Their tensile and toughness properties, however, can be improved by mixing them with zirconium.

183 .
Which of the following statement is wrong?
A)  A mechanical mixture of 87% cementite and 13% ferrite is called pearlite
B)  A steel with 0.8% carbon is wholly pearlite
C)  The cementite is identified as round particles in the structure
D)  The amount of cementite increases with the increase in percentage of carbon in iron

Correct Answer :   A mechanical mixture of 87% cementite and 13% ferrite is called pearlite

184 .
Inconel contains________.
A)  65% nickel, 15% chromium and 20% iron
B)  68% nickel, 29% copper and 3% other constituents
C)  80% nickel, 14% chromium and 6% iron
D)  80% nickel and 20% chromium

Correct Answer :   80% nickel, 14% chromium and 6% iron

185 .
In a hardening process, the hypo-eutectoid steel is
A)  heated below or close to the lower critical temperature and then cooled slowly
B)  heated from 30° C to 50° C above the upper critical temperature and then cooled in still air
C)  heated from 30° C to 50° C above the upper critical temperature and then cooled slowly in the furnace
D)  heated from 30° C to 50° C above the upper critical temperature and then cooled suddenly in a suitable cooling medium

Correct Answer :   heated from 30° C to 50° C above the upper critical temperature and then cooled suddenly in a suitable cooling medium

186 .
The ratio of the volume occupied by the atoms to the total volume of the unit cell is called
A)  space lattice
B)  coordination number
C)  atomic packing factor
D)  None of the above

Correct Answer :   atomic packing factor

187 .
Which of the following statement is incorrect about duralumin?
A)  It can be forged
B)  It is lighter than pure aluminium
C)  It is prone to age hardening
D)  It has good machining properties

Correct Answer :   It is lighter than pure aluminium

188 .
The alloying element which can replace tungsten in high speed steels is
A)  molybdenum
B)  nickel
C)  cobalt
D)  vanadium

Correct Answer :   molybdenum

189 .
Which of the following is an amorphous material?
A)  Glass
B)  Lead
C)  Mica
D)  Silver

Correct Answer :   Glass

190 .
The machinability of steel is improved by adding
A)  nickel
B)  chromium
C)  nickel and chromium
D)  sulphur, lead and phosphorus

Correct Answer :   sulphur, lead and phosphorus

191 .
The carbon in the pig iron varies from
A)  0.1 to 0.5%
B)  0.5 to 1%
C)  1 to 5%
D)  5 to 10%

Correct Answer :   1 to 5%

192 .
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 the above

Correct Answer :   body centred cubic space lattice

193 .
The brown smoke during the operation of a bessemer Converter indicates that the
A)  silicon and manganese has burnt and carbon has started oxidising
B)  air is burning out silicon and managanese
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

Correct Answer :   air is burning out silicon and managanese

194 .
Monel metal is an alloy of________.
A)  nickel and copper
B)  copper and chromium
C)  nickel and chromium
D)  nickel, chromium and iron

Correct Answer :   nickel and copper

195 .
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 the above

Correct Answer :   Both (A) and (B)

196 .
Hindalium is an alloy of aluminium and magnesium with a small quantity of chromium.
A)  Agree
B)  Disagree
C)  Either (A) or (B)
D)  None of the above

Correct Answer :   Agree

197 .
When a low carbon steel is heated upto upper critical temperature
A)  the grain size increases very rapidly
B)  there is no change in grain size
C)  the grain size first increases and then decreases very rapidly
D)  the average grain size is a minimum

Correct Answer :   the average grain size is a minimum

198 .
The steel widely used for motor car crankshafts is
A)  silicon steel
B)  chrome steel
C)  nickel steel
D)  nickel-chrome steel

Correct Answer :   chrome steel

199 .
Combined carbon in iron makes the metal
A)  soft and gives a fine grained crystalline structure
B)  hard and gives a fine grained crystalline structure
C)  soft and gives coarse grained crystalline structure
D)  hard and gives a coarse grained crystalline structure

Correct Answer :   hard and gives a fine grained crystalline structure

200 .
The red flame during the operation of a bessemer converter indicates that the
A)  air is burning out silicon and manganese
B)  converter must be tilted to remove the contents of the converter
C)  red flame does not occur during the operation of a bessemer converter
D)  silicon and manganese has burned out and carbon has started oxidising

Correct Answer :   red flame does not occur during the operation of a bessemer converter

201 .
Phosphor bronze has
A)  good wearing qualities and high elasticity
B)  high resistance to corrosion
C)  valuable cold working property
D)  All of the above

Correct Answer :   good wearing qualities and high elasticity

202 .
In the austempering process of heat treatment, austenite changes into
A)  bainite
B)  sorbite
C)  troostite
D)  martensite

Correct Answer :   bainite

203 .
Y-alloy contains________.
A)  5 to 6% tin, 2 to 3% copper and rest aluminium
B)  4 to 4.5% magnesium, 3 to 4% copper and rest aluminium
C)  3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium
D)  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

Correct Answer :   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

204 .
The main alloying elements high speed steel in order of increasing proportion are
A)  chromium, titanium, vanadium
B)  vanadium, chromium, tungsten
C)  tungsten, titanium, vanadium
D)  tungsten, chromium, titanium

Correct Answer :   vanadium, chromium, tungsten

205 .
Which of the following metal is used for nuclear energy?
A)  Thorium
B)  Niobium
C)  Uranium
D)  All of the above

Correct Answer :   All of the above

206 .
Which of the following metal is used in making electrical resistance wire for electric furnaces and heating elements?
A)  Monel metal
B)  Babbit metal
C)  Nichrome
D)  Phosphor bronze

Correct Answer :   Nichrome

207 .
The material in which the atoms are arranged regularly in some directions but not in others, is called
A)  mesomorphous material
B)  amorphous material
C)  crystalline material
D)  None of the above

Correct Answer :   mesomorphous material

208 .
The steel produced by bessemer or open hearth process is __________ to that produced by L-D process.
A)  superior
B)  inferior
C)  Both (A) and (B)
D)  Can not say

Correct Answer :   inferior

209 .
Crystal structure of a material is, generally, examined by
A)  X-ray techniques
B)  naked eye
C)  optical microscope
D)  metallurgical microscope

Correct Answer :   X-ray techniques

210 .
Iron-carbon alloys containing 1.7 to 4.3% carbon are known as_________.
A)  eutectic cast irons
B)  hyper-eutectic cast irons
C)  Both (A) and (B)
D)  hypo-eutectic cast irons

Correct Answer :   hypo-eutectic cast irons

211 .
The coke in the charge of blast furnace
A)  controls the grade of pig iron
B)  acts as an iron-bearing mineral
C)  forms a slag by combining with impurities
D)  supplies heat to reduce ore and melt the iron

Correct Answer :   supplies heat to reduce ore and melt the iron

212 .
Nimonic contains __________ percentage of nickel as that of Inconel.
A)  less
B)  more
C)  same
D)  None of the above

Correct Answer :   same

213 .
The heat treatment process used for softening hardened steel is
A)  tempering
B)  annealing
C)  carburising
D)  normalising

Correct Answer :   tempering

214 .
The electric process of steel making is especially adopted to
A)  magnet steel
B)  high speed tool steel
C)  alloy and carbon tool steel
D)  All of the above

Correct Answer :   All of the above

215 .
Micro-structure of a material is, generally, examined by
A)  naked eye
B)  X-ray techniques
C)  optical microscope
D)  None of the above

Correct Answer :   optical microscope

Explanation : Microstructures are examined by optical microscopy, by scanning electron microscopy and by transmission electron microscopy.
Ultrasonic imaging is used for detecting defects in a component.

The acoustic waves penetrate the material, enabling one to study the microstructure of material within the volume, to detect small defects, to study adhesive interfaces, and also to gain information about elasticity as well as absorption.

216 .
The addition of magnesium to cast iron increases its
A)  hardness
B)  ductility and strength in tension
C)  creep strength
D)  corrosion resistance

Correct Answer :   ductility and strength in tension

217 .
Killed steels________.
A)  are produced by L-D process
B)  are free from oxygen
C)  have minimum impurity level
D)  have almost zero percentage of phosphorus and sulphur

Correct Answer :   are free from oxygen

218 .
The slow cooling of steel from the __________ results in a coarse grained structure.
A)  lower critical point
B)  upper critical point
C)  Both (A) and (B)
D)  None of the above

Correct Answer :   upper critical point

219 .
Which one of the following sets of constituents is expected in equilibrium cooling of a hyper-eutectoid steel from austenitic state?
A)  Cementite and pearlite
B)  Ferrite and bainite
C)  Ferrite and pearlite
D)  Cementite and martensite

Correct Answer :   Cementite and pearlite

220 .
Which of the following is the primary element used for making stainless steel alloy?
A)  Indium
B)  Vanadium
C)  Chromium
D)  Zirconium

Correct Answer :   Chromium

Explanation : Stainless steels contain iron and a minimum of 10.5% of chromium. This gives it great resistance to corrosion. Therefore, stainless steels are often known as corrosion-resistant steels or chromium-bearing steels.

221 .
What disadvantage does silicon carbide have?
A)  Cost
B)  Tensile strength
C)  Oxidation resistance
D)  Thermal conductivity

Correct Answer :   Cost

Explanation : Silicon carbide has excellent tensile strength, oxidation resistance, and the highest thermal conductivity among the common engineering ceramics. However, it is expensive and only available in limited shapes and sizes. It also has a low strength.

222 .
Which of the following is not a classification of aluminum alloys?
A)  Wrought alloys
B)  Cast alloys
C)  Heat-treatable alloys
D)  Crucible alloys

Correct Answer :   Crucible alloys

Explanation : Aluminum alloys are categorized into wrought alloys, cast alloys, heat-treatable, and non heat-treatable alloys. An example of each is 2.5% Mg, 0.25% Cr, and rest Al (wrought), 12% Si and rest Al (cast), 0.4-0.9% Mg, 0.3-0.7% Si, and rest Al (heat-treatable), and (0.8-1.5% Mn and rest Al (non heat-treatable).

223 .
The property of a material which enables it to retain the deformation permanently, is called
A)  ductility
B)  plasticity
C)  brittleness
D)  malleability

Correct Answer :   plasticity

224 .
Sulphur in cast iron_________.
A)  aids fusibility and fluidity
B)  makes the iron white and hard
C)  increases hardness and brittleness
D)  makes the iron soft and easily machinable

Correct Answer :   increases hardness and brittleness

225 .
Cementite consist of
A)  13% carbon and 87% ferrite
B)  13% cementite and 87% ferrite
C)  6.67% carbon and 93.33% iron
D)  13% ferrite and 87% cementite

Correct Answer :   6.67% carbon and 93.33% iron

226 .
Manganese is added in low carbon steel to
A)  make the steel ductile and of good bending qualities
B)  raise the yield point
C)  make the steel tougher and harder
D)  All of the above

Correct Answer :   make the steel ductile and of good bending qualities

227 .
Beryllium bronze contains__________.
A)  60% copper and 40% beryllium
B)  80% copper and 20% beryllium
C)  99% copper and 1% beryllium
D)  97.75% copper and 2.25% beryllium

Correct Answer :   97.75% copper and 2.25% beryllium

228 .
The portion of the blast furnace below its widest cross-section is called
A)  stack
B)  bosh
C)  throat
D)  hearth

Correct Answer :   bosh

229 .
Gamma-iron occurs between the temperature range 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

Correct Answer :   900°C to 1400°C

230 .
Pearlite consists of___________.
A)  6.67% carbon and 93.33% iron
B)  13% cementite and 87% ferrite
C)  13% carbon and 87% ferrite
D)  13% ferrite and 87% cementite

Correct Answer :   13% cementite and 87% ferrite

231 .
Quenching is not necessary when hardening is done by
A)  nitriding
B)  case hardening
C)  flame hardening
D)  any one of these

Correct Answer :   nitriding

232 .
Beryllium bronze has________.
A)  high yield point
B)  high fatigue limit
C)  Both (A) and (B)
D)  None of the above

Correct Answer :   Both (A) and (B)

233 .
Which of the following material has maximum malleability?
A)  Lead
B)  Copper
C)  Soft steel
D)  Wrought iron

Correct Answer :   Lead

234 .
The machine tool guide ways are usually hardened by
A)  martempering
B)  vacuum hardening
C)  induction hardening
D)  flame hardening

Correct Answer :   flame hardening

235 .
When a steel containing more than 0.8% carbon is cooled slowly below the lower critical point, it consists of
A)  mainly ferrite
B)  pearlite and cementite
C)  mainly pearlite
D)  ferrite and pearlite

Correct Answer :   pearlite and cementite

236 .
Monel metal contains___________.
A)  80% nickel and 20% chromium
B)  80% nickel, 14% chromium and 6% iron
C)  65% nickel, 15% chromium and 20% iron
D)  68% nickel, 29% copper and 3% other constituents

Correct Answer :   68% nickel, 29% copper and 3% other constituents

237 .
The hardness of steel increases if it contains
A)  ferrite
B)  pearlite
C)  cementite
D)  martensite

Correct Answer :   cementite

238 .
In full annealing, the hypo-eutectoid steel is heated from 30° C to 50° C above the upper critical temperature and then cooled
A)  slowly in the furnace
B)  in still air
C)  suddenly in a suitable cooling medium
D)  Any one of these

Correct Answer :   slowly in the furnace

239 .
The lower critical temperature
A)  is same for all steels
B)  depends upon the rate of heating
C)  decreases as the carbon content in steel increases
D)  increases as the carbon content in steel increases

Correct Answer :   is same for all steels

240 .
A steel with 0.8% carbon and 100% pearlite is called
A)  hypo-eutectoid steel
B)  eutectoid steel
C)  hyper-eutectoid steel
D)  None of the above

Correct Answer :   eutectoid steel

241 .
18/8 stainless steel consists of
A)  8% nickel and 8% chromium
B)  18% nickel and 8% chromium
C)  18% chromium and 8% nickel
D)  18% nickel and 18% chromium

Correct Answer :   18% chromium and 8% nickel

242 .
The limestone in the charge of a blast furnace decomposes to give lime and carbon dioxide. The lime thus obtained
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

Correct Answer :   forms a slag by combining with impurities

243 .
Vanadium when added to steel
A)  decreases tensile strength
B)  increases tensile strength
C)  raises critical temperature
D)  Sowers critical temperature

Correct Answer :   increases tensile strength

244 .
High conductivity copper is used ______
A)  To reduce porosity
B)  To raise softening temperature
C)  In electrical engineering
D)  To manufacture semiconductor elements

Correct Answer :   In electrical engineering

Explanation : High conductivity copper contains over 99.9% copper, less than 0.005% of both lead and iron, along with low oxygen content. This copper finds its applications in the field of electrical engineering as it is a great conductor of electricity.

245 .
Which brass alloy is suitable for high-speed machining?
A)  Leaded brass
B)  Muntz metal
C)  Gilding metal
D)  High tensile brass

Correct Answer :   Leaded brass

Explanation : Leaded brass is used for high-speed machining due to its excellent strength and heat resistance. It contains 59% Cu, 39% Zn, and 2% Pb. It is also known as free cutting brass.

246 .
Which of the following type of bearing bronze is the weakest?
A)  Leaded bronze
B)  Sintered bronze
C)  Plain tin bronze
D)  Phosphorus bronze

Correct Answer :   Leaded bronze

Explanation : Leaded bronze is a Copper-base bearing alloy containing 75% Cu, 5% Sn, 18% Pb, and 2% Ni. They are less stronger than other bearing bronzes. However, they can sustain higher loads than white metals, at higher speeds.

247 .
According to Indian standard specifications, a plain carbon steel designated by 40 C8 means that the carbon content is
A)  0.04%
B)  0.4 to 0.6%
C)  0.6 to 0.8%
D)  0.35 to 0.45%

Correct Answer :   0.35 to 0.45%

248 .
Wrought iron________.
A)  is a ductile material
B)  can be easily forged or welded
C)  cannot stand sudden and excessive shocks
D)  All of the above

Correct Answer :   All of the above

249 .
Magnalium is an alloy of magnesium, ________
A)  Zinc and Tin
B)  Nickel and Tin
C)  Nickel and Zinc
D)  Zirconium and Zinc

Correct Answer :   Nickel and Tin

Explanation : Magnalium, although considered an aluminum alloy, may contain over 50% magnesium and small amounts of nickel and tin. They are commonly used for engineering applications and pyrotechnics.

250 .
Which of the following polymer additive is used to remove parts from molds?
A)  Stabilizers
B)  Plasticizers
C)  Lubricants
D)  Reinforcements

Correct Answer :   Lubricants

Explanation : Lubricants are used to remove parts from molds, make surfaces slippery, and prevent them from sticking to each other. They are also known as slip agents. Common lubricant additives are silicone, waxes, fatty acid amides, glycerides, petrolatum etc.

251 .
Which of the following carbides are used for cutting tools?
A)  Tungsten carbide
B)  Silicon carbide
C)  Vanadium carbide
D)  Chromium carbide

Correct Answer :   Tungsten carbide

Explanation : Tungsten carbide (WC) belongs to the carbide class of engineering ceramics. It is used for cutting tools. Silicon carbide and boron carbide are used as abrasive, whereas vanadium carbide and tantalum carbide are used as wear-resistant materials. Chromium carbide is used as wear coating.

252 .
Which of the following is not a type of protective coating?
A)  Organic
B)  Metallic
C)  Non-metallic
D)  Inorganic

Correct Answer :   Non-metallic

Explanation : A protective coating is generally defined as a layer of an inert substance which is applied to a material to prevent the chemical and electrochemical attack. These are classified into metallic, organic, and inorganic coatings.

253 .
Which of the following is an example of soft magnetic material?
A)  Alnico
B)  Strontium
C)  Neodymium
D)  Permalloy

Correct Answer :   Permalloy

Explanation : Permalloy is a soft magnet mainly used in electrical and electronic applications. It is composed of roughly 45% nickel. It has a high relative permeability of around 2700.

254 .
Nodular cast iron is produced by adding __________ to the molten cast iron.
A)  copper
B)  magnesium
C)  nickel
D)  chromium

Correct Answer :   magnesium

255 .
The property of a material due to which it breaks with little permanent distortion, is called
A)  ductility
B)  brittleness
C)  plasticity
D)  malleability

Correct Answer :   brittleness

256 .
Free carbon in iron makes the metal
A)  soft and gives a coarse grained crystalline structure
B)  hard and gives a fine grained crystalline structure
C)  soft and gives a fine grained crystalline structure
D)  hard and gives a coarse grained crystalline structure

Correct Answer :   soft and gives a coarse grained crystalline structure

257 .
The cupola is used to manufacture
A)  steel
B)  pig iron
C)  cast iron
D)  wrought iron

Correct Answer :   cast iron

258 .
The type of space lattice found in gamma-iron is
A)  body centred cubic space lattice
B)  close packed hexagonal space lattice
C)  Both (A) and (B)
D)  face centred cubic space lattice

Correct Answer :   face centred cubic space lattice

259 .
Which of the following is an example of organic insulating material?
A)  Slag
B)  Charcoal
C)  Asbestos
D)  Wood-pulp

Correct Answer :   Wood-pulp

Explanation : Thermal insulation materials are classified as either organic or inorganic. Silk, wool, wood-pulp, and sawdust are a few examples of organic materials. Some common inorganic insulating materials are glass wool, slag, charcoal, and coke powder.

260 .
Which of the following is a characteristic of asbestos minerals?
A)  Poor bonding
B)  Heat resistance
C)  Poor strength
D)  Reacts with acids

Correct Answer :   Heat resistance

Explanation : Asbestos minerals are highly preferred in their fibrous form. They possess high strength, surface area, and good bonding characteristics. They are also resistant to heat, acids, and moisture.

261 .
Which of the following is not a method of fabrication of rubber?
A)  Buffing
B)  Calendering
C)  Vacuum forming
D)  Compression molding

Correct Answer :   Buffing

Explanation : Some of the basic forming and fabrication techniques for rubber include compression molding, calendering, injection and transfer molding, and extrusion among others. Tumbling, trimming, and buffing are techniques of finishing this fabricated rubber.

262 .
The aluminium alloy, mainly used, for anodized utensil manufacture, is
A)  Y-alloy
B)  magnalium
C)  hindalium
D)  duralumin

Correct Answer :   hindalium

263 .
The toughness of a material __________ when it is heated.
A)  increases
B)  remains same
C)  decreases
D)  None of the above

Correct Answer :   decreases

264 .
Bronze is an alloy of
A)  copper and tin
B)  copper and zinc
C)  copper, tin and zinc
D)  None of the above

Correct Answer :   copper and tin

265 .
The coordination number of a face centred cubic space lattice is
A)  six
B)  twelve
C)  eighteen
D)  twenty

Correct Answer :   twelve

266 .
Which among the following is not an amorphous material?
A)  Rubbers
B)  Plastics
C)  Glass
D)  Lead

Correct Answer :   Lead

Explanation : Materials in which the molecule is the basic structural solid and has an irregular structure are known as amorphous solid. Most amorphous materials are polymers such as plastics and rubbers. The most common amorphous material is glass.

267 .
A steel with 0.8% carbon is known as
A)  eutectoid steel
B)  hypo-eutectiod steel
C)  hyper-eutectoid steel
D)  None of the above

Correct Answer :   eutectoid steel

268 .
A fine grained steel
A)  is less tough and has a less tendency to distort during heat treatment
B)  is less tough and has a greater tendency to distort during heat treatment
C)  is more ductile and has a less tendency to distort during heat treatment
D)  is more ductile and has a greater tendency to distort during heat treatment

Correct Answer :   is more ductile and has a less tendency to distort during heat treatment

269 .
What is the result of full annealing of hypoeutectoid steels?
A)  Bainite
B)  Silicon
C)  Cementite
D)  Coarse pearlite

Correct Answer :   Coarse pearlite

Explanation : Hypoeutectoid steels are heated above the A3 line and then cooled in the furnace. Then it removed from the furnace and then cooled at room temperature. This results in coarse pearlite with excess ferrite.

270 .
Babbit metal contains
A)  92% tin, 6% copper and 2% antimony
B)  88% tin, 4% copper and 8% antimony
C)  66% tin, 30% copper and 4% antimony
D)  50% tin and 50% antimony

Correct Answer :   88% tin, 4% copper and 8% antimony

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