EXAC Exam 2 with Complete Solutions
material selection properties-what are the requirement for the most suitable structural
material? - ✔✔the structural material that combine stiffness and elasticity are considered
the most suitable material.
material selection properties-elasticity? - ✔✔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? - ✔✔Maximum stress that a material will
withstand without permanent deformation.
material selection properties-Ductile material - ✔✔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 - ✔✔permanent deformation caused by
strain when stress exceeds a certain value
material selection properties-Brittle material - ✔✔A material that undergoes little
deformation under increasing force, until it breaks suddenly. example glass
material selection properties-stiffness? - ✔✔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? - ✔✔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 - ✔✔the resistance to water and
vapour is an important factor in selection of the material for construction.
material selection properties-thermal conductivity - ✔✔The ability of an object to transfer
heat
material selection properties-material selection and light, radiant heat, transmission ? -
✔✔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? - ✔✔the ability to
resist wear and abrasiveness. durability of a material.
important factor when considering material section.
material selection properties - combustion
combustion - ✔✔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 - ✔✔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? - ✔✔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? - ✔✔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? - ✔✔-input
-life cycle inventory
-output
what is input component of life cycle assessment? - ✔✔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? - ✔✔-water borne effluent
-atmospheric emission
-solid waste
-other environmental releases
what is life cycle inventory component of life cycle assessment of the material? - ✔✔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
material selection properties-what are the requirement for the most suitable structural
material? - ✔✔the structural material that combine stiffness and elasticity are considered
the most suitable material.
material selection properties-elasticity? - ✔✔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? - ✔✔Maximum stress that a material will
withstand without permanent deformation.
material selection properties-Ductile material - ✔✔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 - ✔✔permanent deformation caused by
strain when stress exceeds a certain value
material selection properties-Brittle material - ✔✔A material that undergoes little
deformation under increasing force, until it breaks suddenly. example glass
material selection properties-stiffness? - ✔✔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? - ✔✔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 - ✔✔the resistance to water and
vapour is an important factor in selection of the material for construction.
material selection properties-thermal conductivity - ✔✔The ability of an object to transfer
heat
material selection properties-material selection and light, radiant heat, transmission ? -
✔✔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? - ✔✔the ability to
resist wear and abrasiveness. durability of a material.
important factor when considering material section.
material selection properties - combustion
combustion - ✔✔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 - ✔✔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? - ✔✔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? - ✔✔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? - ✔✔-input
-life cycle inventory
-output
what is input component of life cycle assessment? - ✔✔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? - ✔✔-water borne effluent
-atmospheric emission
-solid waste
-other environmental releases
what is life cycle inventory component of life cycle assessment of the material? - ✔✔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
