In a close packed hexagonal space lattice, there are

nine atoms out of which eight atoms are located at the corners of the cube and one atom at its centre

twelve atoms, all of which are located at the twelve corners of a hexagonal prism

fourteen atoms out of which eight atoms are located at the coners of the cube and six atoms at the centres of six faces

Silicon is added in low carbon steels to

make the steel of good bending qualities

make the steel tougher and harder

make the steel of good bending qualities

According to Indian standard specifications, cast iron designated by 'FG 150' means

white cast iron with B.H.N. 150

white cast iron with 150 MPa as minimum compressive strength

grey cast iron with 150 MPa as minimum tensile strength

The red flame during the operation of a bessemer converter indicates that the

air is burning out silicon and manganese

silicon and manganese has burned out and carbon has started oxidising

converter must be tilted to remove the contents of the converter

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

good wearing qualities and high elasticity

The ductility is the property of a material due to which it

breaks with little permanent distortion

can be rolled or hammered into thin sheets

can resist fracture due to high impact loads

The addition of magnesium to cast iron increases its

ductility and strength in tension

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

acts as an iron-bearing mineral

supplies heat to reduce ore and melt the iron

forms a slag by combining with impurities

Babbit metal contains

92% tin, 6% copper and 2% antimony

66% tin, 30% copper and 4% antimony

88% tin, 4% copper and 8% antimony

92% tin, 6% copper and 2% antimony

The strength is the ability of a material to resist

fracture due to high impact loads

externally applied forces with breakdown or yielding

fracture due to high impact loads

Which of the following statements are true for annealing of steels?

Steels are heated to 500 to 700° C

Cooling is done slowly and steadily

18-4-1 high speed steel contains

vanadium 18%, chromium 1% and tungsten 4%

vanadium 4%, chromium 18% and tungsten 1%

vanadium 1%, chromium 4% and tungsten 18%

vanadium 18%, chromium 1% and tungsten 4%

For a steel containing 0.8% carbon

there is only one critical point

there can be any number of critical points

482 + Mcqs in Engineering Materials in Mechanical Engineering Page 2 McqOptions

51.	In a close packed hexagonal space lattice, there are
A.	nine atoms out of which eight atoms are located at the corners of the cube and one atom at its centre
B.	twelve atoms, all of which are located at the twelve corners of a hexagonal prism
C.	fourteen atoms out of which eight atoms are located at the coners of the cube and six atoms at the centres of six faces
D.	none of the above
Answer» E.

Discussion

52.	Brittle materials when subjected to tensile loads, snap off without giving any sensible elongation.
A.	Yes
B.	No
Answer» B. No

Discussion

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

Discussion

54.	The phosphorus and sulphur in steel making can be removed by using basic bessemer process.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

55.	The heat treatment process used for castings is
A.	carburising
B.	normalising
C.	annealing
D.	tempering
Answer» C. annealing

Discussion

56.	Silicon is added in low carbon steels to
A.	make the steel tougher and harder
B.	make the steel of good bending qualities
C.	raise the yield point
D.	all of these
Answer» B. make the steel of good bending qualities

Discussion

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

Discussion

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

Discussion

59.	Phosphor bronze has
A.	high resistance to corrosion
B.	good wearing qualities and high elasticity
C.	valuable cold working property
D.	all of these
Answer» C. valuable cold working property

Discussion

60.	In the austempering process of heat treatment, austenite changes into
A.	martensite
B.	troostite
C.	sorbite
D.	bainite
Answer» E.

Discussion

61.	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
Answer» B. breaks with little permanent distortion

Discussion

62.	Micro-structure of a material is, generally, examined by
A.	naked eye
B.	optical microscope
C.	X-ray techniques
D.	none of these
Answer» E.

Discussion

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

Discussion

64.	The slow cooling of steel from the __________ results in a coarse grained structure.
A.	lower critical point
B.	upper critical point
Answer» C.

Discussion

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

Discussion

66.	Hardness of steel is increased by adding sulphur, lead and phosphorus.
A.	Yes
B.	No
Answer» C.

Discussion

67.	The machine tool guide ways are usually hardened by
A.	vacuum hardening
B.	martempering
C.	induction hardening
D.	flame hardening
Answer» E.

Discussion

68.	A steel with 0.8% carbon and 100% pearlite is called
A.	eutectoid steel
B.	hypo-eutectoid steel
C.	hyper-eutectoid steel
D.	none of these
Answer» B. hypo-eutectoid steel

Discussion

69.	18/8 stainless steel consists of
A.	18% nickel and 8% chromium
B.	18% chromium and 8% nickel
C.	18% nickel and 18% chromium
D.	8% nickel and 8% chromium
Answer» C. 18% nickel and 18% chromium

Discussion

70.	Vanadium when added to steel
A.	increases tensile strength
B.	decreases tensile strength
C.	raises critical temperature
D.	Sowers critical temperature
Answer» B. decreases tensile strength

Discussion

71.	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
Answer» E.

Discussion

72.	During the operation of a bessemer converter, the white flame indicates that the silicon and managenese had burnt and carbon has started oxidising.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

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

Discussion

74.	A steel with 0.8% carbon is known as
A.	eutectoid steel
B.	hyper-eutectoid steel
C.	hypo-eutectiod steel
D.	none of these
Answer» B. hyper-eutectoid steel

Discussion

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

Discussion

76.	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
Answer» C. fracture due to high impact loads

Discussion

77.	Which of the following is a case hardening process?
A.	Carburising
B.	Cyaniding
C.	Nitriding
D.	all of these
Answer» E.

Discussion

78.	In a crystalline material, atoms are arranged in definite and orderly manner and form.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

79.	The austenitic stainless steel contains
A.	18% chromium and 8% nickel
B.	8% chromium and 18% nickel
C.	14% chromium and 0.35% carbon
D.	14% nickel and 0.35% carbon
Answer» B. 8% chromium and 18% nickel

Discussion

80.	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.	full annealing
C.	process annealing
D.	spheroidising
Answer» D. spheroidising

Discussion

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

Discussion

82.	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
Answer» B. covalent bond

Discussion

83.	Connecting rod is, usually, made from
A.	low carbon steel
B.	high carbon steel
C.	medium carbon steel
D.	high speed steel
Answer» D. high speed steel

Discussion

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

Discussion

85.	The aluminium alloy, mainly used, for anodized utensil manufacture, is
A.	duralumin
B.	Y-alloy
C.	magnalium
D.	hindalium
Answer» E.

Discussion

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

Discussion

87.	In flame hardening, oxy-acetylene flame is used.
A.	Yes
B.	No
Answer» B. No

Discussion

88.	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
Answer» E.

Discussion

89.	The ability of a material to undergo large permanent deformation with the application of a tensile force, is called ductility.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

90.	Which of the following steel making process is being adopted at Rourkela Steel Plant?
A.	Bessemer process
B.	Open-hearth process
C.	Electric process
D.	L-D process
Answer» E.

Discussion

91.	18-4-1 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
Answer» C. vanadium 18%, chromium 1% and tungsten 4%

Discussion

92.	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
Answer» C. 13% ferrite and 87% cementite

Discussion

93.	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
Answer» C. there are two critical points

Discussion

94.	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
Answer» C. melting point

Discussion

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

Discussion

96.	Aluminium has low density and addition of silicon improves its fluidity and therefore, its castability.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

97.	The property of a material essential for spring materials is
A.	stiffness
B.	ductility
C.	resilience
D.	plasticity
Answer» D. plasticity

Discussion

98.	A steel with carbon above 0.8% is known as hyper-eutectoid steel.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

99.	In normalising process, the hypo-eutectiod steel is heated from 30° C to 50° C above the upper critical temperature and then cooled in still air.
A.	True
B.	False
Answer» B. False

Discussion

100.	The compressive strength of cast iron is __________ that of its tensile strength.
A.	equal to
B.	less than
C.	more than
Answer» D.

Discussion

Explore topic-wise MCQs in Mechanical Engineering.

In a close packed hexagonal space lattice, there are

Brittle materials when subjected to tensile loads, snap off without giving any sensible elongation.

The property of a material necessary for forgings, in stamping images on coins and in ornamental work, is

The phosphorus and sulphur in steel making can be removed by using basic bessemer process.

The heat treatment process used for castings is

Silicon is added in low carbon steels to

According to Indian standard specifications, cast iron designated by 'FG 150' means

The red flame during the operation of a bessemer converter indicates that the

Phosphor bronze has

In the austempering process of heat treatment, austenite changes into

The ductility is the property of a material due to which it

Micro-structure of a material is, generally, examined by

The addition of magnesium to cast iron increases its

The slow cooling of steel from the __________ results in a coarse grained structure.

Which one of the following sets of constituents is expected in equilibrium cooling of a hyper-eutectoid steel from austenitic state?

Hardness of steel is increased by adding sulphur, lead and phosphorus.

The machine tool guide ways are usually hardened by

A steel with 0.8% carbon and 100% pearlite is called

18/8 stainless steel consists of

Vanadium when added to steel

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

During the operation of a bessemer converter, the white flame indicates that the silicon and managenese had burnt and carbon has started oxidising.

Babbit metal contains

A steel with 0.8% carbon is known as

When a steel containing more than 0.8% carbon is cooled slowly below the lower critical point, it consists of

The strength is the ability of a material to resist

Which of the following is a case hardening process?

In a crystalline material, atoms are arranged in definite and orderly manner and form.

The austenitic stainless steel contains

The process used for relieving the internal stresses previously set up in the Metal and for increasing the machinability of steel, is

Steel containing upto 0.15% carbon, is known as

The bond formed by transferring electrons from one atom to another is called

Connecting rod is, usually, made from

Which of the following inpurity in cast iron makes it hard and brittle?

The aluminium alloy, mainly used, for anodized utensil manufacture, is

The coordination number of a face centred cubic space lattice is

In flame hardening, oxy-acetylene flame is used.

Which of the following statements are true for annealing of steels?

The ability of a material to undergo large permanent deformation with the application of a tensile force, is called ductility.

Which of the following steel making process is being adopted at Rourkela Steel Plant?

18-4-1 high speed steel contains

Pearlite consists of

For a steel containing 0.8% carbon

In high speed steels, manganese is used to tougher the metal and to increase its

Macro-structure of a material is, generally, examined by

Aluminium has low density and addition of silicon improves its fluidity and therefore, its castability.

The property of a material essential for spring materials is

A steel with carbon above 0.8% is known as hyper-eutectoid steel.

In normalising process, the hypo-eutectiod steel is heated from 30° C to 50° C above the upper critical temperature and then cooled in still air.

The compressive strength of cast iron is __________ that of its tensile strength.