MSE Final Exam Questions and Answers
The direction of motion of a screw dislocations' line is __________ to the direction of an
applied shear stress - ANSWER-perpendicular
The process by which plastic deformation is produced by dislocation motion is called -
ANSWER-slip
For a particular crystal structure, the slip direction is the direction in the slip plane
having the - ANSWER-highest linear density
As the impurity concentration in solid solution of a metal is increased, the tensile
strength - ANSWER-increases
After an edge dislocation has passed through some region of a crystal, the atomic
arrangement of that region is disordered. True or false - ANSWER-false
A metal having a crystal structure with many operable slip systems will be relatively -
ANSWER-ductile
Relative to the direction of an applied shear stress, the direction of motion of an edge
dislocation's line is - ANSWER-parallel
Reducing the grain size of a metal increases its yield strength. True or false - ANSWER-
true
Reducing the grain size of a metal increases its ductility. True or false - ANSWER-true
For a particular crystal structure, the slip plane is he plane having the - ANSWER-most
dense atomic packing
Which of the following correctly represents, for an amorphous polymer, the sequential
change in mechanical state with increasing temperature - ANSWER-glass, then
transition to rubbery solid, then transition to viscous liquid
How does the decrease in molecular weight influence a tensile modulus of a
semicrystalline polymer? - ANSWER-non-direct influence
How does the decrease in molecular weight influence a tensile strength of a
semicrystalline polymer - ANSWER-decreases tensile strength
As %CW in metallic alloy is increased (yield strength and ductility) - ANSWER-yield
strength increases and ductility decreases
The direction of motion of a screw dislocations' line is __________ to the direction of an
applied shear stress - ANSWER-perpendicular
The process by which plastic deformation is produced by dislocation motion is called -
ANSWER-slip
For a particular crystal structure, the slip direction is the direction in the slip plane
having the - ANSWER-highest linear density
As the impurity concentration in solid solution of a metal is increased, the tensile
strength - ANSWER-increases
After an edge dislocation has passed through some region of a crystal, the atomic
arrangement of that region is disordered. True or false - ANSWER-false
A metal having a crystal structure with many operable slip systems will be relatively -
ANSWER-ductile
Relative to the direction of an applied shear stress, the direction of motion of an edge
dislocation's line is - ANSWER-parallel
Reducing the grain size of a metal increases its yield strength. True or false - ANSWER-
true
Reducing the grain size of a metal increases its ductility. True or false - ANSWER-true
For a particular crystal structure, the slip plane is he plane having the - ANSWER-most
dense atomic packing
Which of the following correctly represents, for an amorphous polymer, the sequential
change in mechanical state with increasing temperature - ANSWER-glass, then
transition to rubbery solid, then transition to viscous liquid
How does the decrease in molecular weight influence a tensile modulus of a
semicrystalline polymer? - ANSWER-non-direct influence
How does the decrease in molecular weight influence a tensile strength of a
semicrystalline polymer - ANSWER-decreases tensile strength
As %CW in metallic alloy is increased (yield strength and ductility) - ANSWER-yield
strength increases and ductility decreases
