FRACTURES SET 02

FRACTURES SET 02

1. Ceramics generally undergo ductile fracture.
a) True
b) False
 

Answer: b
 
2. Necking means local deformation of a ductile material subjected to tensile loading.
a) True
b) False
 

Answer: a

3. Which of the following is not a stage of ductile fracture?
a) Nucleation of crack
b) Growth of crack
c) Coalescence of cracks
d) Development of tensile stresses
 

Answer: d

4. Cracks can’t nucleate at ____________
a) Grain boundaries
b) Crystal
c) Interfaces
d) Inclusion brittle particles
 

Answer: b

5. In aluminum copper system, which causes crack initiation?
a) Fe3C
b) CuAl2
c) Ti3Al
d) NiAl
 

Answer: b

6. What causes nucleation of crack in steel?
a) CuAl2
b) Ti3Al
c) Oxides
d) Fe3C
 

Answer: d

7. What is nucleation sites in copper?
a) CuAl2
b) Fe3C
c) Oxide inclusions
d) NiAl
 

Answer: c

8. Titanium aluminum alloys generate cracks due to ___________ particles.
a) Ti3Al
b) Fe3N
c) CuAl2
d) Oxide inclusions
 

Answer: a
9. On stressing a material, necking starts at a point of _______________
a) Plastic instability
b) Higher elastic modules
c) Higher regular arrangement
d) Higher stress
 

Answer: a

10. _____________ occurs during tensile deformation.
a) Compressive stress
b) Strain hardening
c) Forging
d) Shear stress
 

Answer: b