EXAC- EXAM 3 QUESTIONS AND
ANSWERS
material selection properties-what are the requirement for the most suitable structural
material? - Correct Answers -the structural material that combine stiffness and elasticity
are considered the most suitable material.
material selection properties-elasticity? - Correct Answers -The ability of a material to
bounce back after being disturbed
- the ability of the body to deform under stress, bend, stretch and compress when the
external forces are applied and return to its original shapes when the forces are
removed.
material selection properties-elastic limit? - Correct Answers -Maximum stress that a
material will withstand without permanent deformation.
material selection properties-Ductile material - Correct Answers -A material which can
be drawn out into a wire. This implies that plastic strain occurs under enough stress.
- the material that undergo plastic deformation before breakage are called ductile
material.
material selection properties-plastic deformation - Correct Answers -permanent
deformation caused by strain when stress exceeds a certain value
material selection properties-Brittle material - Correct Answers -A material that
undergoes little deformation under increasing force, until it breaks suddenly. example
glass
material selection properties-stiffness? - Correct Answers -The resistance of an elastic
body to deflection by an applied force.
the force that is applied to the material to bring it to the elastic limit.
material selection properties-what is dimension stability of the material? - Correct
Answers -the property of the material to keep its dimension properties especially when
the direct affect of the moisture content or atmosphere are applied to it. dimension
ability is important when considering material selection.
,material selection properties-water and vapor resistance - Correct Answers -the
resistance to water and vapour is an important factor in selection of the material for
construction.
material selection properties-thermal conductivity - Correct Answers -The ability of an
object to transfer heat
material selection properties-material selection and light, radiant heat, transmission ? -
Correct Answers -the material property that reflect or absorb light are important factors
for deciding a material selection
the reflection or absorption of radiant heat should also be considered in selecting the
material.
material selection properties- what is density and hardness of a material? - Correct
Answers -the ability to resist wear and abrasiveness. durability of a material.
important factor when considering material section.
material selection properties - combustion
combustion - Correct Answers -the property of the material to resist combustion.
-withstand exposure to fire.
-not produce toxic smoke/gases or smell.
material selection properties - colour, texture, scale , shapes - Correct Answers -
important factor considering design requirement and presentation of the material.
many material are produces in certain shapes and sizes, it varries with the manufacture
little bit but relatively small. this is also a factor to consider when selection of the
material.
eg- bricks, stock dimension etc.
material selection properties? - Correct Answers -elasticity
ductile material
stiffness
plastic deformation
resistance to water and vapor
brittle material
resistance to exposure to heat, not producing toxic waste etc.
absorption of light,
absorption of sound
colour/texture /shape
combustion
thermal conductivity
, What is a life cycle assessment? - Correct Answers -the selection and valuation of
material should not only limit to its functional aspect, aesthetic and economic aspect but
should also consider the impact of the the environmental factors.
The investigation and valuation of the environmental impacts of a given product or
service caused or necessitated by its existence.
the life cycle assessment of a material includes,
-extraction of the raw material.
-processing of the raw material.
-manufacturing, packaging and transportation of the finished product
-maintenance of the material in use.
-possible recycling and reuse of the material and its final disposal.
Life Cycle Assessment of material include three component? - Correct Answers --input
-life cycle inventory
-output
what is input component of life cycle assessment? - Correct Answers -raw material,
energy and water
processes are
- acquisition of raw material---- the extractions of raw material and its impact on the
environment. Is the material extracted is renewable or nonrenewable eg. metals are non
renewable
where as timber can be renewable resource
-processing, manufacturing and packaging ----what are energy and water requirement
for the processing, manufacturing and packaging.
-transportation and distribution
-construction use and distribution .
-disposal, recycling and reuse.
what is output component of life cycle assessment? - Correct Answers --water borne
effluent
-atmospheric emission
-solid waste
-other environmental releases
what is life cycle inventory component of life cycle assessment of the material? - Correct
Answers -life cycle inventory is explained as, a selection of those material that
demonstrate that there life cycle inventory resulted is lesser impact to the environment.
to explain this, the material that may require more energy for production but balance
there life cycle inventory over time would be a preferable choose over a material that is
produced with less energy but require heavy maintenance hence more energy
consumption, coal for example.
ANSWERS
material selection properties-what are the requirement for the most suitable structural
material? - Correct Answers -the structural material that combine stiffness and elasticity
are considered the most suitable material.
material selection properties-elasticity? - Correct Answers -The ability of a material to
bounce back after being disturbed
- the ability of the body to deform under stress, bend, stretch and compress when the
external forces are applied and return to its original shapes when the forces are
removed.
material selection properties-elastic limit? - Correct Answers -Maximum stress that a
material will withstand without permanent deformation.
material selection properties-Ductile material - Correct Answers -A material which can
be drawn out into a wire. This implies that plastic strain occurs under enough stress.
- the material that undergo plastic deformation before breakage are called ductile
material.
material selection properties-plastic deformation - Correct Answers -permanent
deformation caused by strain when stress exceeds a certain value
material selection properties-Brittle material - Correct Answers -A material that
undergoes little deformation under increasing force, until it breaks suddenly. example
glass
material selection properties-stiffness? - Correct Answers -The resistance of an elastic
body to deflection by an applied force.
the force that is applied to the material to bring it to the elastic limit.
material selection properties-what is dimension stability of the material? - Correct
Answers -the property of the material to keep its dimension properties especially when
the direct affect of the moisture content or atmosphere are applied to it. dimension
ability is important when considering material selection.
,material selection properties-water and vapor resistance - Correct Answers -the
resistance to water and vapour is an important factor in selection of the material for
construction.
material selection properties-thermal conductivity - Correct Answers -The ability of an
object to transfer heat
material selection properties-material selection and light, radiant heat, transmission ? -
Correct Answers -the material property that reflect or absorb light are important factors
for deciding a material selection
the reflection or absorption of radiant heat should also be considered in selecting the
material.
material selection properties- what is density and hardness of a material? - Correct
Answers -the ability to resist wear and abrasiveness. durability of a material.
important factor when considering material section.
material selection properties - combustion
combustion - Correct Answers -the property of the material to resist combustion.
-withstand exposure to fire.
-not produce toxic smoke/gases or smell.
material selection properties - colour, texture, scale , shapes - Correct Answers -
important factor considering design requirement and presentation of the material.
many material are produces in certain shapes and sizes, it varries with the manufacture
little bit but relatively small. this is also a factor to consider when selection of the
material.
eg- bricks, stock dimension etc.
material selection properties? - Correct Answers -elasticity
ductile material
stiffness
plastic deformation
resistance to water and vapor
brittle material
resistance to exposure to heat, not producing toxic waste etc.
absorption of light,
absorption of sound
colour/texture /shape
combustion
thermal conductivity
, What is a life cycle assessment? - Correct Answers -the selection and valuation of
material should not only limit to its functional aspect, aesthetic and economic aspect but
should also consider the impact of the the environmental factors.
The investigation and valuation of the environmental impacts of a given product or
service caused or necessitated by its existence.
the life cycle assessment of a material includes,
-extraction of the raw material.
-processing of the raw material.
-manufacturing, packaging and transportation of the finished product
-maintenance of the material in use.
-possible recycling and reuse of the material and its final disposal.
Life Cycle Assessment of material include three component? - Correct Answers --input
-life cycle inventory
-output
what is input component of life cycle assessment? - Correct Answers -raw material,
energy and water
processes are
- acquisition of raw material---- the extractions of raw material and its impact on the
environment. Is the material extracted is renewable or nonrenewable eg. metals are non
renewable
where as timber can be renewable resource
-processing, manufacturing and packaging ----what are energy and water requirement
for the processing, manufacturing and packaging.
-transportation and distribution
-construction use and distribution .
-disposal, recycling and reuse.
what is output component of life cycle assessment? - Correct Answers --water borne
effluent
-atmospheric emission
-solid waste
-other environmental releases
what is life cycle inventory component of life cycle assessment of the material? - Correct
Answers -life cycle inventory is explained as, a selection of those material that
demonstrate that there life cycle inventory resulted is lesser impact to the environment.
to explain this, the material that may require more energy for production but balance
there life cycle inventory over time would be a preferable choose over a material that is
produced with less energy but require heavy maintenance hence more energy
consumption, coal for example.
