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WorksheetsES404 Quiz 2
Total questions: 70
Worksheet time: 42mins
What property of a material is measured by the area under the stress-strain curve
Elastic modulus
Yield strength
Toughness
Ultimate tensile strength
Check all that applies:
What are the Mechanical Properties of Engineering Materials?
toughness
weldability
chemical composition
resilience
It is defined as the restoring force per unit area of the material.
stress
strain
fatigue
elasticity
It is defined as the ability of a material to absorb the energy and gets plastically deformed without fracturing.
toughness
strength
ductility
fatigue
It is the ability of a material to attain the hardness by heat treatment processing.
hardness
hardenability
brittleness
malleability
Which of the 3 figures shows brittleness?
A
B
C
Which of the 3 figures shows the most ductile material?
A
B
C
Which of the following is TRUE about malleability of a material?
malleability indicates how hard a material gets deformed under compressive stress.
malleability is the ability of a material to be formed by melting.
malleability si temperature independent.
malleability is the ability of a material to be formed by hammering or rolling.
During a tensile test on a ductile material ____________
Nominal stress at fracture is higher than the ultimate stress
True stress at fracture is higher than the ultimate stress
True stress a fracture is the same as the ultimate stress
None of the mentioned
When equal and opposite forces applied to a body, tend to elongate it, the stress so produced, is called ____________
Shear stress
Compressive stress
Tensile stress
Transverse stress
In a tensile test, near the elastic limit zone ____________
Tensile stress increases in linear proportion to the stress
Tensile stress increases at a faster rate
Tensile stress decreases at a faster rate
None of the mentioned
The phenomenon of slow growth of strain under a steady tensile stress is called ____________
Yielding
Creeping
Breaking
None of the mentioned
In a tensile test on mild steel specimen, the breaking stress as compared to ultimate tensile stress is
More
Less
Same
More/Less depending on composition
In a tensile test, near the elastic limit zone, the
Tensile strain increases more quickly
Tensile strain decreases more quickly
Tensile strain increases in proportion to the stress
Tensile strain decreases in proportion to the stress
Tensile test can be performed on
Impact testing machine
Universal testing machine
Rockwell tester
Brinell tester
Which machine records the change in length of specimen?
Impact testing machine
Universal testing machine
Rockwell tester
Brinell tester
The ability of the material to resist stress without failure is called
Strength
Hardness
stiffness
toughness
_____ occurs when metal is subjected to a constant tensile load at an elevated temperature?
Fatigue
Creep
Impact
Wear
Creep is a ____ dependent phenomenon.
Temperature
Time
Load
Stress cycle
The ______ the melting point and the _____ the elastic modulus, the higher is creep strength.
Lower, lower
Lower, higher
Higher, lower
Higher, higher
Which one of the following, is a static mechanical property?
Impact strength
Creep strength
Fatigue strength
Rebound hardness
With which factor, a magnitude of creep doesn’t increase?
Temperature
Time
Grain Size
Stress
Hardness test is the ability of a material
to resist
Scratching
Wear and tear
Indentation.
Fracture
The following tests are hardness test
Tensile test.
Vickers Test
Rockwell Test
Creep Test.
Which of following tests uses spherical indenter.
.Brinell test.
Vickers Test
Rockwell Test
Creep Test.
Which of following tests uses pyramid indenter
.Brinell test.
Vickers Test
Rockwell Test
Creep Test.
In following Brinell hardness quotation
(1800 HBW 10/3000/30 ) , HBW means
Test time.
Diameter of indenter
The applied force.
Indenter material.
In following Brinell hardness quotation
(1800 HBW 10/3000/30 ) , 10 is for
Test time.
Diameter of indenter
The applied force.
Indenter material.
Energy stored within elastic limit is
toughness
resilience
modulus of elasticity
Young's Modulus is measure of
hardness
stiffness
ductility
strength
% elongation is
measure of malleability
measure of hardness
measure of ductility
all of these
strength of the material depends on
load applied on the material
shape & size of the component
both the options are correct
none of the options are correct
Hardness of thin hard sample is measured by
Brinell Hardness Test
Knoop Hardness Test
Which of the following is true?
true stres is more than eng. stress but true strain is less than eng. strain
true stres is less than eng. stress and true strain is less than eng. strain
true stres is more than eng. stress and true strain is more than eng. strain
true stres is less than eng. stress but true strain is more than eng. strain
Name four SEQUENTIAL regions characterised from conventional stress-strain diagram of typical ductile materials
Elastic -> Strain hardening -> Yielding -> Necking
Elastic -> Yielding -> Strain hardening -> Necking
Elastic -> Yielding -> Necking -> Strain hardening
And which region is mainly of interest?
Plastic
Strain hardening
Yielding
Elastic
In solid mechanics, plastic deformation can be defined as deformation in which:
the material return back to its original position after load is removed
the material undergoes a temporary change
the material cannot return back to its original position after load is removed
the material undergoes a reversible process
none of the above
Which of the following is not one of the critical points for strength specification on the stress-strain diagram:
Yield stress
Proportional limit
Necking
Elastic limit
Fracture stress
On the stress-strain curve, there are four regions. Which is the following is not a region on the stress-strain curve:
Necking
Yielding
Elastic region
Strain hardening
Ultimate stress
Stress / strain =
Modulus of elasticity
Modulus of ductility
Modulus of liquicity
All of the above
Rubber band is an example of what property of material?
Malleability
Flexibility
Elasticity
This property of material has need to change first before a certain property can be observed?
Physical Property
Chemical Property
A characteristic of material that be readily observed without changing its composition. What property it is?
Physical Property
Chemical Property
Hardness is the ability of material to be rigid pressure that may cause deformation or change in its shape. Example, metal and wood.
TRUE
FALSE
What material can conduct heat and electricity, can be hammered into different shapes, and can bej drawn into a wire.
metal
plastic
cloth
glass
It is the ability of solids to be hammered into thin sheets.
Malleability
Elasticity
It is the ability of material that does not allow heat to flow.
Insulator
Conductivity
It refers to the ability of materials to resist scratching.
Strength
Hardness
It is the ability of particles of matter to be drawn close together or be made compact.
Malleability
Compressibility
It is the ability of a material to allow heat to flow.
Conductivity
Insulator
What is the phase change of a solid to a liquid?
freezing
melting
boiling
condensation
Which of the following factors does NOT typically affect the rate of a chemical reaction?
Temperature
Concentration of reactants
Presence of a catalyst
Molecular weight of the products
Which type of bonding is responsible for the high electrical conductivity of metals?
Covalent bonding
Ionic bonding
Metallic bonding
Hydrogen bonding
What is the primary function of a corrosion inhibitor?
Increase the rate of corrosion
Initiate corrosion reactions
Slow down or prevent corrosion
Enhance metal conductivity
The process of passivation is most commonly associated with which type of materials?
Metals
Polymers
Ceramics
Semiconductors
Which property is characteristic of a substance undergoing a chemical change?
Change in color
Change in density
Change in phase
Change in mass
The phenomenon of superconductivity is characterized by:
Infinite electrical resistance
High thermal conductivity
Low magnetic susceptibility
Rapid elastic deformation
e property that describes a material's ability to conduct heat is known as:
Thermal diffusivity
Thermal conductivity
Specific heat capacity
Which physical property is associated with a material's ability to absorb and release heat without undergoing a phase change?
Thermal expansion
Specific heat capacity
Thermal conductivity
Melting point
The concept of relative density (specific gravity) compares the density of a substance to the density of:
Water
Air
Iron
Gold
Which property is inversely proportional to density, meaning that as one increases, the other decreases?
Hardness
Compressibility
Elasticity
None of the above
Which factor is primarily responsible for the difference in melting points between molecular compounds and ionic compounds?
Size of molecules
Type of bonding
Molecular weight
Density
Which of the following substances is likely to have the highest boiling point?
Methane
Ethanol
Water
Hydrogen chloride
Which of the following materials is typically an insulator?
Copper
Silicon
Graphite
Rubber
What is the SI unit of electrical conductivity?
Ohm
Siemens
Ampere
Volts
What is the role of impurities in the electrical conductivity of semiconductors?
Increase conductivity
Decrease conductivity
Have no effect on conductivity
Convert semiconductors into insulators
