Question

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

          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

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

Added by Juan Manuel D.

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