AE 210 MIDTERM JSU EXAM STUDY GUIDE
Define manufacturing - ANSWER the making of articles on a large scale using machinery
What are the four categories of engineering materials used in manufacturing. - ANSWER
metal, polymers, ceramics, and composites materials
Manufacturing processes are usually accomplished as unit operations. define unit
operation. - ANSWER One of the sequence of steps required to transform a starting
material into a final part or product.
What is the difference between primary and secondary bonding in the structure of
materials - ANSWER Primary bonds are characterized by atom to atom bonding by
sharing valence electrons.
Secondary bonds are characterized by molecule to molecule bonding or otherwise
known as intermolecular forces
What is the difference between engineering stress and true stress in a tensile test? -
ANSWER Engineering Stress: The applied force in a tensile test divided by the original
cross-sectional area of the test specimen.
True Stress: The stress value obtained by dividing the instantaneous value of
cross-sectional area into the applied load.
Define tensile strength of a material. - ANSWER The engineering stress calculated at the
point applied load reaches a maximum value; also known as the ultimate tensile
strength.
Define yield strength of a material. - ANSWER The stress in the linear relationship of the
stress-strain curve (elastic region) at which the material begins to yield and permanent
deformation occurs.
What is work hardening? - ANSWER Another name for strain hardening; a metal's
tendency to increase its strength as it is strained.
Tensile testing is not appropriate for hard brittle materials such as ceramics. What is the
test commonly used to determine the strength properties of such material? - ANSWER A
three point bending test is commonly used to test the strength of brittle materials. The
test provides a measure called the transverse rupture strength for these materials.
Which operation is a property-enhancing operation? - ANSWER Operations that improve
physical properties of a work material without changing its shape; heat treatment is the
most common example.
Define density as a material property. - ANSWER A material's weight per unit volume.
, What is the difference in melting characteristics between a pure metal element and a
metal alloy? - ANSWER A pure metal element has one singular melting point at which the
metal element changes from a solid to a liquid.
A metal alloy has a range of melting points in which the metal elements that make up the
alloy melt at different
What is thermal conductivity as a material property? - ANSWER is the intrinsic property
of a material which relates its ability to conduct heat.
Why are metals better conductors of electricity than ceramics and polymers? - ANSWER
Metals are a conductor which is a material that has low resistance to the flow of
electricity. Ceramics and Polymers have high resistance to the flow of electricity.
What is a tolerance? - ANSWER Allowed variation from a dimension; ANSI definition:
"the total amount by which a specific dimension is permitted to vary. The tolerance is
the difference between the maximum and minimum limits.".
What is accuracy in measurement? - ANSWER Accuracy refers to the closeness of a
measured value to a standard or known value.
What is meant by the term graduated measuring device? - ANSWER Include a set of
markings (called graduations) on a linear or angular scale to which the object's feature
of interest can be compared for measurement.
Name some manufacturing processes that produce very good or excellent surface
finishes. - ANSWER honing, lapping, polishing, and superfinishing.
What is an alloy? - ANSWER A metal composed of two or more elements, at least one of
which is metallic.
What is the range of carbon percentages that defines an iron-carbon alloy as steel? -
ANSWER The carbon content ranges from 0.02 to 2.11%
What is the definition of strength-to-weight ratio of a material? - ANSWER The tensile
strength of the material divided by its density; useful in comparing materials for
structural applications such as aerospace in which weight and energy are of concern.
What is the predominant alloying element in all the stainless steels. - ANSWER The major
metals for alloying are chromium and nickel.
Identify some of the properties for which aluminum is noted. - ANSWER physically,
chemically, and mechanically aluminum is similar to steel, brass, copper, zinc, lead, or
titanium.
light weight, corrosion resistant, electrically and thermally conductant, reflective,
ductile, impermeable and odorless.
What is the most important engineering property of copper that determines most of its
Define manufacturing - ANSWER the making of articles on a large scale using machinery
What are the four categories of engineering materials used in manufacturing. - ANSWER
metal, polymers, ceramics, and composites materials
Manufacturing processes are usually accomplished as unit operations. define unit
operation. - ANSWER One of the sequence of steps required to transform a starting
material into a final part or product.
What is the difference between primary and secondary bonding in the structure of
materials - ANSWER Primary bonds are characterized by atom to atom bonding by
sharing valence electrons.
Secondary bonds are characterized by molecule to molecule bonding or otherwise
known as intermolecular forces
What is the difference between engineering stress and true stress in a tensile test? -
ANSWER Engineering Stress: The applied force in a tensile test divided by the original
cross-sectional area of the test specimen.
True Stress: The stress value obtained by dividing the instantaneous value of
cross-sectional area into the applied load.
Define tensile strength of a material. - ANSWER The engineering stress calculated at the
point applied load reaches a maximum value; also known as the ultimate tensile
strength.
Define yield strength of a material. - ANSWER The stress in the linear relationship of the
stress-strain curve (elastic region) at which the material begins to yield and permanent
deformation occurs.
What is work hardening? - ANSWER Another name for strain hardening; a metal's
tendency to increase its strength as it is strained.
Tensile testing is not appropriate for hard brittle materials such as ceramics. What is the
test commonly used to determine the strength properties of such material? - ANSWER A
three point bending test is commonly used to test the strength of brittle materials. The
test provides a measure called the transverse rupture strength for these materials.
Which operation is a property-enhancing operation? - ANSWER Operations that improve
physical properties of a work material without changing its shape; heat treatment is the
most common example.
Define density as a material property. - ANSWER A material's weight per unit volume.
, What is the difference in melting characteristics between a pure metal element and a
metal alloy? - ANSWER A pure metal element has one singular melting point at which the
metal element changes from a solid to a liquid.
A metal alloy has a range of melting points in which the metal elements that make up the
alloy melt at different
What is thermal conductivity as a material property? - ANSWER is the intrinsic property
of a material which relates its ability to conduct heat.
Why are metals better conductors of electricity than ceramics and polymers? - ANSWER
Metals are a conductor which is a material that has low resistance to the flow of
electricity. Ceramics and Polymers have high resistance to the flow of electricity.
What is a tolerance? - ANSWER Allowed variation from a dimension; ANSI definition:
"the total amount by which a specific dimension is permitted to vary. The tolerance is
the difference between the maximum and minimum limits.".
What is accuracy in measurement? - ANSWER Accuracy refers to the closeness of a
measured value to a standard or known value.
What is meant by the term graduated measuring device? - ANSWER Include a set of
markings (called graduations) on a linear or angular scale to which the object's feature
of interest can be compared for measurement.
Name some manufacturing processes that produce very good or excellent surface
finishes. - ANSWER honing, lapping, polishing, and superfinishing.
What is an alloy? - ANSWER A metal composed of two or more elements, at least one of
which is metallic.
What is the range of carbon percentages that defines an iron-carbon alloy as steel? -
ANSWER The carbon content ranges from 0.02 to 2.11%
What is the definition of strength-to-weight ratio of a material? - ANSWER The tensile
strength of the material divided by its density; useful in comparing materials for
structural applications such as aerospace in which weight and energy are of concern.
What is the predominant alloying element in all the stainless steels. - ANSWER The major
metals for alloying are chromium and nickel.
Identify some of the properties for which aluminum is noted. - ANSWER physically,
chemically, and mechanically aluminum is similar to steel, brass, copper, zinc, lead, or
titanium.
light weight, corrosion resistant, electrically and thermally conductant, reflective,
ductile, impermeable and odorless.
What is the most important engineering property of copper that determines most of its
