In a face centred cubic space lattice, there are

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 hexagonal faces and three atoms are symmetrically arranged in the body of the cell

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

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

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 hexagonal faces and three atoms are symmetrically arranged in the body of the cell

carbon in the form of free graphite

is less tough and has a less tendency to distort during heat treatment

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

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

is less tough and has a less tendency to distort during heat treatment

is more ductile and has a greater tendency to distort during heat treatment

increases hardness and brittleness

makes the iron soft and easily machinable

increases hardness and brittleness

Muntz metal (Yellow brass) contains

59% copper, 40% zinc and 1% tin

60.45% copper, 35.2% zinc and 5.35% nickel

Which of the following gives the correct order of increasing hot hardness of cutting tool materials?

High speed steel, Diamond, Carbide

Diamond, Carbide, High speed steel

Carbide, Diamond, High speed steel

High speed steel, Carbide, Diamond

High speed steel, Diamond, Carbide

The slag from the blast furnace

is used as a ballast for rail road

is mixed with tar for road making

consists of calcium, aluminium and ferrous silicates

Thermosetting plastics are those materials which

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

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

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

are flexible and can withstand considerable wear under suitable conditions

are used as a friction lining for clutches and brakes

good wearing qualities and high elasticity

high yield point, high fatigue limit and excellent cold and hot corrosion resistance

Silicon bronze contains

76% copper, 20% silicon and 4% zinc

60% copper, 35% zinc and 5% manganese

88% copper, 10% tin and 2% zinc

96% copper, 3% silicon and 1% manganese

76% copper, 20% silicon and 4% zinc

In acidic bessemer process, the furnace is lined with

a mixture of tar and burnt dolomite bricks

Admirality gun metal contains

60% copper, 35% zinc and 5% manganese

76% copper, 20% silicon and 4% zinc

82% copper, 12% zinc and 6% manganese

88% copper, 10% tin and 2% zinc

Chilled cast iron is produced

from white cast iron by annealing process

by adding magnesium to molten cast iron

by quick cooling of molten cast iron

from white cast iron by annealing process

482 + Mcqs in Engineering Materials in Mechanical Engineering Page 1 McqOptions

1.	In a face centred cubic 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.	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.	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 hexagonal faces and three atoms are symmetrically arranged in the body of the cell
D.	none of the above
Answer» C. 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 hexagonal faces and three atoms are symmetrically arranged in the body of the cell

2.	The fuel used in a blast furnace is
A.	coal
B.	coke
C.	wood
D.	producer gas
Answer» C. wood

3.	Face centred cubic space lattice is found in gamma-iron, aluminium, copper, lead, silver and nickel.
A.	True
B.	False
Answer» B. False

4.	Which of the following is a point imperfection?
A.	Vacancy
B.	Interstitial imperfection
C.	Frenkel imperfection
D.	all of these
Answer» E.

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

6.	Aluminium bronze has high resistance to corrosion.
A.	True
B.	False
Answer» C.

7.	Manganese bronze contains more copper than silicon bronze.
A.	Yes
B.	No
Answer» C.

8.	Grey cast iron has
A.	carbon in the form of free graphite
B.	high tensile strength
C.	low compressive strength
D.	all of these
Answer» B. high tensile strength

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

10.	In a unit cell of a body centred cubic space lattice, there are __________ atoms.
A.	six
B.	nine
C.	fourteen
D.	seventeen
Answer» C. fourteen

11.	The nuts and bolts are made from silicon steel.
A.	Correct
B.	Incorrect
Answer» C.

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

15.	Nichrome contains more iron than Inconel.
A.	Agree
B.	Disagree
Answer» B. Disagree

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

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

12.	Silicon in cast iron
A.	makes the iron soft and easily machinable
B.	increases hardness and brittleness
C.	makes the iron white and hard
D.	aids fusibility and fluidity
Answer» B. increases hardness and brittleness

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

18.	A carbon steel having Brinell hardness number 100 should have ultimate tensile strength closer to
A.	100 N/mm
B.	200 N/mm
C.	350 N/mm
D.	1000 N/mm
Answer» D. 1000 N/mm

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

20.	The catalysts are used to accelerate the chemical reaction during the process of ploymerisation of plastics.
A.	True
B.	False
Answer» B. False

21.	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
Answer» C. 59% copper, 40% zinc and 1% tin

24.	Which of the following is a mesomorphous material?
A.	Mica
B.	Silver
C.	Lead
D.	Brass
Answer» B. Silver

25.	The malleability is the property of a material due to which it can be rolled or hammered into thin sheets.
A.	Agree
B.	Disagree
Answer» B. Disagree

26.	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
Answer» B. medium

27.	Which of the following solids are malleable and ductile?
A.	Ionic solids
B.	Covalent solids
C.	Metallic solids
D.	none of these
Answer» D. none of these

Explore topic-wise MCQs in Mechanical Engineering.

In a face centred cubic space lattice, there are

The fuel used in a blast furnace is

Face centred cubic space lattice is found in gamma-iron, aluminium, copper, lead, silver and nickel.

Which of the following is a point imperfection?

The process in which carbon and nitrogen both are absorbed by the metal surface to get it hardened is known as

Aluminium bronze has high resistance to corrosion.

Manganese bronze contains more copper than silicon bronze.

Grey cast iron has

A fine grained steel

In a unit cell of a body centred cubic space lattice, there are __________ atoms.

The nuts and bolts are made from silicon steel.

Silicon in cast iron

The process which improves the machinability of steels, but lowers the hardness and tensile strength, is

Which of the following material has maximum malleability?

Nichrome contains more iron than Inconel.

Which of the following iron exists at 910° C?

The iron ore mostly used for the production of pig iron is

A carbon steel having Brinell hardness number 100 should have ultimate tensile strength closer to

The steel widely used for making precision measuring instruments is

The catalysts are used to accelerate the chemical reaction during the process of ploymerisation of plastics.

Muntz metal (Yellow brass) contains

Which of the following gives the correct order of increasing hot hardness of cutting tool materials?

The slag from the blast furnace

Which of the following is a mesomorphous material?

The malleability is the property of a material due to which it can be rolled or hammered into thin sheets.

The process of inducing carbon to __________ carbon steels in order to give it a hard surface is known as carburising.

Which of the following solids are malleable and ductile?

The delta-iron possesses a body centred cubic space lattice.

Thermosetting plastics are those materials which

The casting ability of aluminium increases when __________ is added to aluminium.

Manganese bronze has

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

Silicon bronze contains

In acidic bessemer process, the furnace is lined with

The high speed steel has __________ percentage of tungsten.

The essential constituent of a hardened steel is

The cutting tools are made from

The maximum solubility of carbon in austenite is 1.7% at 1130° C.

Admirality gun metal contains

The percentage of phosphorus is phosphor bronze is

In high speed steels, vanadium adds to the property of red hardness and tungsten and chromium add to high wear resistance.

For the pipe fitting like elbow, tee, union etc., which of the following is preferred?

Chilled cast iron is produced

In corrosion resistant properties, bronzes are __________ to brasses.

Steel containing 0.8 to 1.5% carbon, is known as

Iron-carbon alloys containing 4.3% carbon are known as hypo-eutectic cast irons.

The approximate height of a blast furnace is

A steel alloy containing 36% nickel is called

The addition of manganese to aluminium improves corrosion resistance.

The temperature point at which the change ends on heating the steel is called

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

32.	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.	normalising
B.	annealing
C.	austempering
D.	martempering
Answer» D. martempering

34.	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 these
Answer» B. a mixture of tar and burnt dolomite bricks

35.	The high speed steel has __________ percentage of tungsten.
A.	maximum
B.	minimum
Answer» B. minimum

36.	The essential constituent of a hardened steel is
A.	pearlite
B.	austenite
C.	martensite
D.	troostite
Answer» D. troostite

37.	The cutting tools are made from
A.	nickel steel
B.	chrome steel
C.	nickel-chrome steel
D.	high speed steel
Answer» E.

38.	The maximum solubility of carbon in austenite is 1.7% at 1130° C.
A.	Yes
B.	No
Answer» B. No

40.	The percentage of phosphorus is phosphor bronze is
A.	0.1
B.	1
C.	11.1
D.	98
Answer» B. 1

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

44.	In corrosion resistant properties, bronzes are __________ to brasses.
A.	superior
B.	inferior
Answer» B. inferior