Cast iron possessing which one of the following metallographic structures is best suited for damping capacity in engineering applications?

Silicon carbide in flake structure

Magnetic materials which may be readily magnetized in either direction are

high eddy current loss materials

Direction: It consists of two statements, one labelled as ‘Statement (I)’ and the others as ‘Statement (II)’. You are to examine these two statements carefully and select the answer using the codes given below:Statement (I): Abrasive ceramics are used to wear, grind, or cut away other material, which necessarily is softer.Statement (II): The prime requisite for abrasive ceramic group of materials is hardness or wear resistance and a high degree of toughness is essential to ensure that the abrasive particles do not easily fracture.

Both Statement (I) and Statement (II) are individually true but Statement (II) is not the correct explanation of Statement (I)

Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I)

Both Statement (I) and Statement (II) are individually true but Statement (II) is not the correct explanation of Statement (I)

Statement (I) is true but Statement (II) is false

Statement (I) is false but Statement (II) is true

At electric Breakdown

Semiconductor becomes conductor

Conductor becomes superconductor

Most outstanding property of indium antimonide is

Very low conductivity at room temperature

High resistivity at room temperature

Very low conductivity at room temperature

Magnetism is mainly due to only electron spin around their own axis in case of

paramagnetic and diamagnetic materials

Direction: It consists of two statements, one labeled as ‘Statement (I)’ and the others as ‘Statement (II)’. You are to examine these two statements carefully and select the answer using the codes given below:Statement (I): By measuring the Hall-effect voltage, one can determine:(a) The strength of the field in terms of the current, or(b) The current in terms of the fieldStatement (II): In the case of a semiconductor, the mobility of the carriers can be determined by using (b), so long as only one kind of carrier is present.

Both Statement (I) and Statement (II) are individually true but Statement (II) is NOT the correct explanation of Statement (I)

Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I)

Both Statement (I) and Statement (II) are individually true but Statement (II) is NOT the correct explanation of Statement (I)

Statement (I) is true but Statement (II) is false

Statement (I) is false but Statement (II) is true

Directions: It consists of two statements, one labelled as the ‘Statement (I)’ and the other as ‘Statement (II)’. Examine these two statements carefully and select the answers to these items using the codes given below:Statement (I):A semi-conductor is not capable of sustaining the movement of free negative electrons, but capable of positive charges or holes.Statement (II):The positive charges cannot be positrons because to liberate the latter, an energy as high as one million eV or more would be required.

Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I)

Both Statement (I) and Statement (II) are individually true but Statement (II) is not the correct explanation of Statement (I)

Statement (I) is true but Statement (II) is false

Statement (I) is false but Statement (II) is true

A material having FCC structure has inter atomic distance as 3° A. which of the following are true?

Effective no. of atoms = 4/cell

Atoms per sq. mm is [100] is 1.11 × 1013

is harder than high carbon steel

has lower tensile strength relative to high carbon steel

is harder than high carbon steel

is ideal steel for heat treatment

has carbon percentage upto 1.5%

Which of the following determines the frequency of atomic vibrations in the crystal

Number of atoms per unit in crystal

Stiffness of the bond it makes with the neighbour

Number of atoms per unit in crystal

Chilled cast iron is produced__________

By adding magnesium to molten cast iron

From white cast iron by annealing process

Intense magnetic field may be produced in a coil by using a

Normal metal with a large number of turns and sending a large current.

Type I superconductor with a large number of turns and sending a large current.

Type II superconductor with a large number of turns and sending a large current.

Type II superconductor with a large number of turns but limiting the current density below a critical value.

HS6 – 5 – 2 – 5 indicates high-speed steel containing:

Mo = 6%, V = 5%, W = 2%, Co = 5%

Mo = 6%, W = 5%, V = 2%, Co = 5%

W = 6%. Mo = 5%, V = 2%, Co = 5%

Mo = 6%, V = 5%, W = 2%, Co = 5%

Co = 6%, Mo = 5%, V = 2% , W = 5%

Ferromagnet can be demagnetised by

Keeping Magnet in Alternating fields

In iron carbide diagram, pearlite is

Eutectoid mixture of austenite and cementite.

Eutectoid mixture of austenite and ferrite.

Eutectoid mixture of cementite and ferrite.

Eutectoid mixture of austenite and cementite.

Eutectoid mixture of austenite and ferrite

For a ductile material, toughness is a measure of

Ability to absorb energy till elastic limit

Ability to absorb energy up to fracture

Ability to absorb energy till elastic limit

Direction: It consists of two statements, one labelled as Statement (I) and the other as Statement (II). Examine these two statements carefully and select the answers to these items using the codes given below:Statement (I): Cold-working of a conductor material results in a decrease in the electrical conductivity of a metal because the localized strains interfere with the electron movement.Statement (II): Subsequent annealing of the conductor material restores the electrical conductivity by establishing greater regularity in the crystal lattice.

Both statement (I) and Statement (II) are individually true and Statement (II) is not the correct explanation of Statement (I)

Both statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I)

Both statement (I) and Statement (II) are individually true and Statement (II) is not the correct explanation of Statement (I)

Statement (I) is true but Statement (II) is false

Statement (I) is false but Statement (II) is true

283 + Mcqs in Structure And Properties Of Engineering Materials in Mechanical Engineering Page 4 McqOptions

151.	Cast iron possessing which one of the following metallographic structures is best suited for damping capacity in engineering applications?
A.	Excess cementite
B.	Carbon in temper form
C.	Silicon carbide in flake structure
D.	Spheroidal form of graphite
Answer» E.

Discussion

152.	During tensile testing of a material, if cross-sectional area of the specimen is doubled, the load required to produce the same elongation shall be
A.	Double
B.	Half
C.	Same
D.	Four times
Answer» B. Half

Discussion

153.	______ is the hardest known material.
A.	Cemented carbide
B.	Ceramic
C.	Diamond
D.	Alloy steel
Answer» D. Alloy steel

Discussion

154.	Cast Iron is a:
A.	Ductile material
B.	Malleable material
C.	Brittle material
D.	Tough material
Answer» D. Tough material

Discussion

155.	Match List-II (Match property) with List-II (Related to) and select the correct answer using the codes. Given below the lists.List-IList-IIA. Malleability1. Wire drawingB. Hardness2. Impact loadsC. Resilience3. Cold rollingD. Isotropy4. Indentation 5. Direction Codes:
A.	A-4, B-2, C-1, D-3
B.	A-3, B-4, C-2, D-5
C.	A-5, B-4, C-2, D-3
D.	A-3, B-2, C-1, D-5
Answer» C. A-5, B-4, C-2, D-3

Discussion

156.	Magnetic materials which may be readily magnetized in either direction are
A.	soft magnetic materials
B.	hard magnetic materials
C.	high eddy current loss materials
D.	high hysteresis loss materials
Answer» B. hard magnetic materials

Discussion

157.	Direction: It consists of two statements, one labelled as ‘Statement (I)’ and the others as ‘Statement (II)’. You are to examine these two statements carefully and select the answer using the codes given below:Statement (I): Abrasive ceramics are used to wear, grind, or cut away other material, which necessarily is softer.Statement (II): The prime requisite for abrasive ceramic group of materials is hardness or wear resistance and a high degree of toughness is essential to ensure that the abrasive particles do not easily fracture.
A.	Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I)
B.	Both Statement (I) and Statement (II) are individually true but Statement (II) is not the correct explanation of Statement (I)
C.	Statement (I) is true but Statement (II) is false
D.	Statement (I) is false but Statement (II) is true
Answer» B. Both Statement (I) and Statement (II) are individually true but Statement (II) is not the correct explanation of Statement (I)

Discussion

158.	_____ is the ability of steel to resist stresses that are reversal in nature.
A.	Impact strength
B.	Fatigue strength
C.	Toughness
D.	Hardness
Answer» C. Toughness

Discussion

159.	At electric Breakdown
A.	conductor become insulator
B.	Insulator becomes Conductor
C.	Semiconductor becomes conductor
D.	Conductor becomes superconductor
Answer» C. Semiconductor becomes conductor

Discussion

160.	Most outstanding property of indium antimonide is
A.	A very wide range gap
B.	High resistivity at room temperature
C.	High carrier mobility
D.	Very low conductivity at room temperature
Answer» D. Very low conductivity at room temperature

Discussion

161.	Magnetism is mainly due to only electron spin around their own axis in case of
A.	diamagnetic materials
B.	paramagnetic materials
C.	ferromagnetic materials
D.	paramagnetic and diamagnetic materials
Answer» D. paramagnetic and diamagnetic materials

Discussion

162.	Proof resilience per unit volume of a material is known as
A.	modulus of resilience
B.	resilience
C.	proof resilience
D.	toughness
Answer» B. resilience

Discussion

163.	Direction: It consists of two statements, one labeled as ‘Statement (I)’ and the others as ‘Statement (II)’. You are to examine these two statements carefully and select the answer using the codes given below:Statement (I): By measuring the Hall-effect voltage, one can determine:(a) The strength of the field in terms of the current, or(b) The current in terms of the fieldStatement (II): In the case of a semiconductor, the mobility of the carriers can be determined by using (b), so long as only one kind of carrier is present.
A.	Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I)
B.	Both Statement (I) and Statement (II) are individually true but Statement (II) is NOT the correct explanation of Statement (I)
C.	Statement (I) is true but Statement (II) is false
D.	Statement (I) is false but Statement (II) is true
Answer» B. Both Statement (I) and Statement (II) are individually true but Statement (II) is NOT the correct explanation of Statement (I)

Discussion

164.	Consider the following data for copper:Energy for vacancy formation is 0.9 eV/atomAtom weight is 63.5 g/molDensity is 8.4 g/cm3 at 1000°CThe equilibrium number of vacancies per cubic meter at 1000°C will be
A.	3.2 × 1020
B.	3.2 × 1025
C.	2.2 × 1020
D.	2.2 × 1025
Answer» E.

Discussion

165.	Consider the following materials:(i) Quartz(ii) Ammonium dihydrogen phosphate(iii) Lithium sulfateArrange the above materials in decreasing order of their dielectric constant.
A.	(i), (ii), (iii)
B.	(ii), (iii), (i)
C.	(iii), (ii), (i)
D.	(i), (iii), (ii)
Answer» C. (iii), (ii), (i)

Discussion

166.	Directions: It consists of two statements, one labelled as the ‘Statement (I)’ and the other as ‘Statement (II)’. Examine these two statements carefully and select the answers to these items using the codes given below:Statement (I):A semi-conductor is not capable of sustaining the movement of free negative electrons, but capable of positive charges or holes.Statement (II):The positive charges cannot be positrons because to liberate the latter, an energy as high as one million eV or more would be required.
A.	Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I)
B.	Both Statement (I) and Statement (II) are individually true but Statement (II) is not the correct explanation of Statement (I)
C.	Statement (I) is true but Statement (II) is false
D.	Statement (I) is false but Statement (II) is true
Answer» E.

Discussion

167.	A type I superconductor is1. A conductor of infinite conductivity at all temperatures.2. A conductor with very large conductivity below a critical temperature.3. A material showing susceptibility 1 below critical temperature.4. A perfect conductor having conductivity drastically reduced by a critical current.
A.	1, 2 and 3 only
B.	2, 3 and 4 only
C.	1, 2 and 4 only
D.	1, 2, 3 and 4
Answer» C. 1, 2 and 4 only

Discussion

168.	In a binary system of A and B, a liquid of 20% A (80% B) is coexisting with a solid of 70% A (30% B). For an overall composition having 40% A, the fraction of solid is
A.	0.4
B.	0.5
C.	0.6
D.	0.75
Answer» B. 0.5

Discussion

169.	A material having FCC structure has inter atomic distance as 3° A. which of the following are true?
A.	Effective no. of atoms = 4/cell
B.	APF is 74%
C.	Atoms per sq. mm is [100] is 1.11 × 1013
D.	All of these
Answer» B. APF is 74%

Discussion

170.	Chromium in stainless steel provides:
A.	hardenability
B.	low toughness
C.	corrosion resistance
D.	less ductility
Answer» D. less ductility

Discussion

171.	Monel metal chemical composition primarily by A = 70 percent and B = 30 percent approximately. A and B are ______ and ______, respectively.
A.	Cu and Ni
B.	Cu and Sn
C.	Ni and Cu
D.	Sn and Cu
Answer» D. Sn and Cu

Discussion

172.	Low carbon steel:
A.	has lower tensile strength relative to high carbon steel
B.	is harder than high carbon steel
C.	is ideal steel for heat treatment
D.	has carbon percentage upto 1.5%
Answer» B. is harder than high carbon steel

Discussion

173.	A steel with 0.8% carbon and 100% pearlite is called-
A.	Pro eutectoid steel
B.	Hypo-eutectoid steel
C.	Eutectoid steel
D.	Hyper eutectoid steel
Answer» D. Hyper eutectoid steel

Discussion

174.	Which of the following determines the frequency of atomic vibrations in the crystal
A.	Crystal element
B.	Crystal temperature
C.	Stiffness of the bond it makes with the neighbour
D.	Number of atoms per unit in crystal
Answer» D. Number of atoms per unit in crystal

Discussion

175.	Chilled cast iron is produced__________
A.	All of the options
B.	By adding magnesium to molten cast iron
C.	From white cast iron by annealing process
D.	By cooling of molten cast iron
Answer» E.

Discussion

176.	Intense magnetic field may be produced in a coil by using a
A.	Normal metal with a large number of turns and sending a large current.
B.	Type I superconductor with a large number of turns and sending a large current.
C.	Type II superconductor with a large number of turns and sending a large current.
D.	Type II superconductor with a large number of turns but limiting the current density below a critical value.
Answer» E.

Discussion

177.	Elements A and B form eutectic type binary phase diagrams and the eutectic composition is 60 wt% B. If just below eutectic temperature, the eutectic phase contains equal amounts (by wt) of two solid phases, then the compositions of the two solid phases are
A.	20 wt% B and 90 wt% B
B.	30 wt% B and 90 wt% B
C.	20 wt% B and 80 wt% B
D.	30 wt% B and 80 wt% B
Answer» C. 20 wt% B and 80 wt% B

Discussion

178.	Compressive strength of cast iron compared to tensile strength is
A.	More
B.	Less
C.	Same
D.	None
Answer» B. Less

Discussion

179.	HS6 – 5 – 2 – 5 indicates high-speed steel containing:
A.	Mo = 6%, W = 5%, V = 2%, Co = 5%
B.	W = 6%. Mo = 5%, V = 2%, Co = 5%
C.	Mo = 6%, V = 5%, W = 2%, Co = 5%
D.	Co = 6%, Mo = 5%, V = 2% , W = 5%
Answer» C. Mo = 6%, V = 5%, W = 2%, Co = 5%

Discussion

180.	Ferromagnet can be demagnetised by
A.	Heating to Curie Temperature
B.	Keeping Magnet in Alternating fields
C.	Exposure to Cyclic Fields
D.	All of these
Answer» E.

Discussion

181.	For elements of the iron group, the net orbital dipole moment in the solid-state is
A.	zero
B.	10 - 20
C.	10000 - 12000
D.	infinity
Answer» B. 10 - 20

Discussion

182.	In iron carbide diagram, pearlite is
A.	Eutectoid mixture of austenite and ferrite.
B.	Eutectoid mixture of cementite and ferrite.
C.	Eutectoid mixture of austenite and cementite.
D.	Eutectoid mixture of austenite and ferrite
Answer» C. Eutectoid mixture of austenite and cementite.

Discussion

183.	_______ does not contain tin as an alloying element.
A.	Babbitt metal
B.	White metal
C.	Solder
D.	All options are correct
Answer» C. Solder

Discussion

184.	Alloys of magnesium are
A.	easy to machine
B.	magnetic
C.	light
D.	prone to corrosion
Answer» D. prone to corrosion

Discussion

185.	Composite materials generally have
A.	High Elastic Modulus
B.	High Specific Strength
C.	Both 1 and 2
D.	Low Stiffness
Answer» D. Low Stiffness

Discussion

186.	Group I lists phases of steel and Group II lists crystal structures in the table below.Group IGroup IIP. Ferrite1. Hexagonal Close Packed (HCP)Q. Austenite2. Body Centered Cubic (BCC)R. Martensite3. Body Centered Tetragonal (BCT) 4. Face Centered Cubic (FCC)Match the phase with the corresponding crystal structure.
A.	P - 2, Q - 4, R - 3
B.	P - 4, Q - 2, R - 3
C.	P - 2, Q - 4, R - 1
D.	P - 4, Q - 2, R - 1
Answer» B. P - 4, Q - 2, R - 3

Discussion

187.	In which one of the following types of bonds, the bond formation is by free moving electrons in an array of positive ions?
A.	Homopolar bond
B.	Electrostatic bond
C.	Metallic bond
D.	Covalent bond
Answer» D. Covalent bond

Discussion

188.	In the superconducting state, the flux lines of a magnetic field are ejected out of the superconductor as per
A.	Curie effect
B.	Faraday’s effect
C.	Maxwell’s effect
D.	Meissner effect
Answer» E.

Discussion

189.	Pneumatic structures are:1. Membrane structures2. Stabilized by compressed air3. Characterized by internal pressure being less than external pressure4. Characterized by internal pressure being equal to or more than external pressureSelect the correct answer using the codes given below:
A.	1, 2 and 3
B.	1, 2 and 4
C.	2 and 4 only
D.	1 and 4 only
Answer» C. 2 and 4 only

Discussion

190.	Consider the following characterizing parameters of a material:1. Magnetic permeability2. Electron relaxation time3. Electron effective mass4. Energy bandgapIn the case of metals, an increase in one of the above parameters decreases its conductivity, while an increase in another increases the conductivity. These are respectively
A.	1 and 3
B.	3 and 2
C.	4 and 3
D.	1 and 2
Answer» C. 4 and 3

Discussion

191.	_______ steel is widely used for rails of a railway track.
A.	Mild
B.	High carbon
C.	Silicon
D.	Nickel
Answer» C. Silicon

Discussion

192.	Percentage of carbon in steel is _____.
A.	0.1% to 0.8%
B.	0.35% to 0.45%
C.	1.8% to 4.2%
D.	0.1% to 1.5%
Answer» E.

Discussion

193.	In ionic crystals, electrical conductivity is
A.	Very high
B.	Depends on material
C.	Depends on temperature
D.	Practically zero
Answer» E.

Discussion

194.	If S is the applied stress, c is the width of the crack and r the radius of curvature at the tip of the crack, Griffith’s crack theory gives the concentrated stress Sc as
A.	2 S (c/r)1/2
B.	2 S (c/r)1/3
C.	S (c/r)1/2
D.	2 S (2c/r)1/2
Answer» B. 2 S (c/r)1/3

Discussion

195.	An alloy produced by adding 1% of tin to Muntz metal is called as
A.	a brass
B.	Admiralty brass
C.	Naval brass
D.	Leaded brass
Answer» D. Leaded brass

Discussion

196.	At which temperature does aluminum become soft and loses its strength?
A.	120° C
B.	160° C
C.	150° C
D.	800° C
Answer» C. 150° C

Discussion

197.	Identify which of the below is neither mechanical/physical nor the chemical property of insulation?
A.	Combustibility
B.	Breaking load
C.	Appearance
D.	Expansion
Answer» E.

Discussion

198.	Machinability of steel is improved by adding
A.	Nickel
B.	Chromium
C.	Sulphur, lead and phosphorus
D.	None of the above
Answer» D. None of the above

Discussion

199.	For a ductile material, toughness is a measure of
A.	Resistance to scratching
B.	Ability to absorb energy up to fracture
C.	Ability to absorb energy till elastic limit
D.	Resistance to indentation
Answer» C. Ability to absorb energy till elastic limit

Discussion

200.	Direction: It consists of two statements, one labelled as Statement (I) and the other as Statement (II). Examine these two statements carefully and select the answers to these items using the codes given below:Statement (I): Cold-working of a conductor material results in a decrease in the electrical conductivity of a metal because the localized strains interfere with the electron movement.Statement (II): Subsequent annealing of the conductor material restores the electrical conductivity by establishing greater regularity in the crystal lattice.
A.	Both statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I)
B.	Both statement (I) and Statement (II) are individually true and Statement (II) is not the correct explanation of Statement (I)
C.	Statement (I) is true but Statement (II) is false
D.	Statement (I) is false but Statement (II) is true
Answer» B. Both statement (I) and Statement (II) are individually true and Statement (II) is not the correct explanation of Statement (I)

Discussion

Explore topic-wise MCQs in Mechanical Engineering.

Cast iron possessing which one of the following metallographic structures is best suited for damping capacity in engineering applications?

During tensile testing of a material, if cross-sectional area of the specimen is doubled, the load required to produce the same elongation shall be

______ is the hardest known material.

Cast Iron is a:

Match List-II (Match property) with List-II (Related to) and select the correct answer using the codes. Given below the lists.List-IList-IIA. Malleability1. Wire drawingB. Hardness2. Impact loadsC. Resilience3. Cold rollingD. Isotropy4. Indentation 5. Direction Codes:

Magnetic materials which may be readily magnetized in either direction are

_____ is the ability of steel to resist stresses that are reversal in nature.

At electric Breakdown

Most outstanding property of indium antimonide is

Magnetism is mainly due to only electron spin around their own axis in case of

Proof resilience per unit volume of a material is known as

Consider the following data for copper:Energy for vacancy formation is 0.9 eV/atomAtom weight is 63.5 g/molDensity is 8.4 g/cm3 at 1000°CThe equilibrium number of vacancies per cubic meter at 1000°C will be

Consider the following materials:(i) Quartz(ii) Ammonium dihydrogen phosphate(iii) Lithium sulfateArrange the above materials in decreasing order of their dielectric constant.

In a binary system of A and B, a liquid of 20% A (80% B) is coexisting with a solid of 70% A (30% B). For an overall composition having 40% A, the fraction of solid is

A material having FCC structure has inter atomic distance as 3° A. which of the following are true?

Chromium in stainless steel provides:

Monel metal chemical composition primarily by A = 70 percent and B = 30 percent approximately. A and B are ______ and ______, respectively.

Low carbon steel:

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

​Which of the following determines the frequency of atomic vibrations in the crystal

Chilled cast iron is produced__________

Intense magnetic field may be produced in a coil by using a

Elements A and B form eutectic type binary phase diagrams and the eutectic composition is 60 wt% B. If just below eutectic temperature, the eutectic phase contains equal amounts (by wt) of two solid phases, then the compositions of the two solid phases are

Compressive strength of cast iron compared to tensile strength is

HS6 – 5 – 2 – 5 indicates high-speed steel containing:

Ferromagnet can be demagnetised by

For elements of the iron group, the net orbital dipole moment in the solid-state is

In iron carbide diagram, pearlite is

_______ does not contain tin as an alloying element.

Alloys of magnesium are

Composite materials generally have

In which one of the following types of bonds, the bond formation is by free moving electrons in an array of positive ions?

In the superconducting state, the flux lines of a magnetic field are ejected out of the superconductor as per

Pneumatic structures are:1. Membrane structures2. Stabilized by compressed air3. Characterized by internal pressure being less than external pressure4. Characterized by internal pressure being equal to or more than external pressureSelect the correct answer using the codes given below:

_______ steel is widely used for rails of a railway track.

Percentage of carbon in steel is _____.

In ionic crystals, electrical conductivity is

If S is the applied stress, c is the width of the crack and r the radius of curvature at the tip of the crack, Griffith’s crack theory gives the concentrated stress Sc as

An alloy produced by adding 1% of tin to Muntz metal is called as

At which temperature does aluminum become soft and loses its strength?

Identify which of the below is neither mechanical/physical nor the chemical property of insulation?

Machinability of steel is improved by adding

For a ductile material, toughness is a measure of

Monel metal chemical composition primarily by A = 70 percent and B = 30 percent approximately. A and B are and , respectively.

Which of the following determines the frequency of atomic vibrations in the crystal