1.
Creep is affected by the following factor(s):
a) Temperature
b) Strain
c) Stress
d) Strain rate
e) a) and b) above
f) a) and c) above
2.
At a microscopic level, the yield stress is defined as the minimum stress to:
a) Break all the bonds in a crystal
b) Increase the distance between two atoms in a crystal
c) Cause dislocation motion
d) Rotate a grain
e) Increase vacancy concentration
f) None of the above
3.
Factor(s) that influence the mechanical properties of semicrystalline polymers include(s):
a) Molecular weight
b) Degree of crystallinity
c) Pre-deformation by drawing
d) Heat-treating
e) a) and b) above
f) a), b) and d) above
g) a), b), c), d)
4.
A brittle fracture involves
a) Necking
b) Microvoid formation, coalescence and growth
c) Cup-and-cone formation
d) All of the above
e) None of the above
5.
A region adjacent to the weld that may have experienced microstructural and property
alterations is termed
a) Solidification zone
b) Heat-affected zone
c) Weldability
d) Diffusion bonding
e) All of the above
6.
The mechanisms of brittle failure of ceramic materials can be explained by:
a) Difficulty of slip
b) Electrically charged nature of the ions
c) Easy dislocation motion
d) a) and b) above
e) b) and c) above
