Texas MMET 201 Assessment 1 Rated A+
Properties of materials differ because - ANS-atomic structure
composition
impurities and vacancies
grain size
method of manufacturing
Types of Ferrous - ANS-steels, cast irons, carbon, alloy, stainless steal
Types of Nonferrous - ANS-Aluminum, Copper, Titanium Tungsten, low melting
point alloys
Types of Plastics - ANS-Thermoplastics, Thermosets, & Elastomers
BCC crystal structure, # of possible slip systems, probability of slip - ANS-full
spherical atom in middle, 48, high
FCC crystal structure, # of possible slip systems, probability of slip - ANS-4 parts of
spherical atom in middle, 12, moderate
HCP crystal structure, # of possible slip systems, probability of slip - ANS-
hexagonal structure, 3, low
Allotropism (polymorphism) - ANS-the appearance of more than one type of crystal
of the same metal
Two mechanisms of plastic deformation - ANS-Slipping and twinning
Slipping - ANS-slipping of one plane of atoms over a slip plane under shear stress
Twinning - ANS-a portion of the crystal forms a mirror image of itself across the
plane of twinning
Types of imperfections - ANS-Point defects, linear dislocations, volume
imperfections, planar imperfections
Types of point defects - ANS-vacancies, interstitial atoms, impurities
Types of linear dislocations - ANS-edge and screw
increase in shear stress ________________ the strength and hardness - ANS-
increases
Grain boundaries have influence on the __________ and _________ of metals -
ANS-strength and ductility
, The number and size of grains depends on - ANS-nucleation rate, number of sites
of crystal formation, crystals growth rate
Grain size influences ___________ properties of metals - ANS-mechanical
Low strength, hardness, and ductility = _______ grain size - ANS-large
Entanglement and dislocations = ________ materials - ANS-stronger
Anisotropy - ANS-properties of the material are different in different directions bc of
plastic deformation
Types of anisotropy - ANS-preferred orientation and mechanical fibering
Cold-working happens at ______ - ANS-room temperature
Hot-working happens above ______ - ANS-recrystalization temp
Annealing - ANS-heating the metal to a specific temperature range for a period of
time
Annealing 3 step process - ANS-Recovery, Recrystalization, Grain growth
Time for recrystalization decreases as temperature ________ - ANS-increases
Caliper is used directly to measure the flatness and roundness T/F? - ANS-False
How do you determine resolution on dial calipers(in)? - ANS-0.001"/2 = 0.0005
The tools shown are used to measure in mm or inches the diameter of a hole T/F?
(Go --- Not Go & Go Not Go ---) - ANS-False
The tolerance in the diameter shown is
(Figure 19.10 to 19.02) - ANS-Tolerance = (19.10-19.02)/2 = 0.04
The measuring instrument shown below is used to measure
(protractor w/ ruler perpendicular in middle) - ANS-none of the above
Only technical decisions should be considered in production decisions in plastics
industry T/F? - ANS-False
In dealing with vendors: - ANS-None of the above
As a polymers manufacturer, it is recommended all the time to make all of your
parts in house T/F? - ANS-False
Mechanical Properties - ANS-strength, toughness, ductility, hardness, elasticity,
fatigue, creep
Properties of materials differ because - ANS-atomic structure
composition
impurities and vacancies
grain size
method of manufacturing
Types of Ferrous - ANS-steels, cast irons, carbon, alloy, stainless steal
Types of Nonferrous - ANS-Aluminum, Copper, Titanium Tungsten, low melting
point alloys
Types of Plastics - ANS-Thermoplastics, Thermosets, & Elastomers
BCC crystal structure, # of possible slip systems, probability of slip - ANS-full
spherical atom in middle, 48, high
FCC crystal structure, # of possible slip systems, probability of slip - ANS-4 parts of
spherical atom in middle, 12, moderate
HCP crystal structure, # of possible slip systems, probability of slip - ANS-
hexagonal structure, 3, low
Allotropism (polymorphism) - ANS-the appearance of more than one type of crystal
of the same metal
Two mechanisms of plastic deformation - ANS-Slipping and twinning
Slipping - ANS-slipping of one plane of atoms over a slip plane under shear stress
Twinning - ANS-a portion of the crystal forms a mirror image of itself across the
plane of twinning
Types of imperfections - ANS-Point defects, linear dislocations, volume
imperfections, planar imperfections
Types of point defects - ANS-vacancies, interstitial atoms, impurities
Types of linear dislocations - ANS-edge and screw
increase in shear stress ________________ the strength and hardness - ANS-
increases
Grain boundaries have influence on the __________ and _________ of metals -
ANS-strength and ductility
, The number and size of grains depends on - ANS-nucleation rate, number of sites
of crystal formation, crystals growth rate
Grain size influences ___________ properties of metals - ANS-mechanical
Low strength, hardness, and ductility = _______ grain size - ANS-large
Entanglement and dislocations = ________ materials - ANS-stronger
Anisotropy - ANS-properties of the material are different in different directions bc of
plastic deformation
Types of anisotropy - ANS-preferred orientation and mechanical fibering
Cold-working happens at ______ - ANS-room temperature
Hot-working happens above ______ - ANS-recrystalization temp
Annealing - ANS-heating the metal to a specific temperature range for a period of
time
Annealing 3 step process - ANS-Recovery, Recrystalization, Grain growth
Time for recrystalization decreases as temperature ________ - ANS-increases
Caliper is used directly to measure the flatness and roundness T/F? - ANS-False
How do you determine resolution on dial calipers(in)? - ANS-0.001"/2 = 0.0005
The tools shown are used to measure in mm or inches the diameter of a hole T/F?
(Go --- Not Go & Go Not Go ---) - ANS-False
The tolerance in the diameter shown is
(Figure 19.10 to 19.02) - ANS-Tolerance = (19.10-19.02)/2 = 0.04
The measuring instrument shown below is used to measure
(protractor w/ ruler perpendicular in middle) - ANS-none of the above
Only technical decisions should be considered in production decisions in plastics
industry T/F? - ANS-False
In dealing with vendors: - ANS-None of the above
As a polymers manufacturer, it is recommended all the time to make all of your
parts in house T/F? - ANS-False
Mechanical Properties - ANS-strength, toughness, ductility, hardness, elasticity,
fatigue, creep
