Metal Fracture Types MCQs : This section focuses on the "Metal Fracture Types". These Multiple Choice Questions (MCQs) should be practiced to improve the Metal Fracture Types skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
Determine the cohesive strength of glass fibre, if E = 90 GPa, Surface energy = 1.2 Jm-1/2 and a0=0.18 nm?
A. 29.5 GPa
B. 10 GPa
C. 24.5 GPa
D. 150 MPa
Question 2
If the crack length inside the material is increased by 4 times. The fracture strength will ___________
A. decrease by 4 times
B. decrease by 2 times
C. increase by 4 times
D. increase by 2 times
Question 3
The appearance of surface of brittle fracture will be ___________
A. grey and fibrous
B. bright and granular
C. dull and granular
D. riverlike pattern
Question 4
The appearance of surface of ductile fracture will be ___________
A. grey and fibrous
B. bright and granular
C. dull and granular
D. riverlike pattern
Question 5
The brittle fracture is considered much more severe than ductile fracture.
A. True
B. False
Question 6
The brittle fracture is not observed in ___________
A. BCC
B. FCC
C. HCP
D. DC
Question 7
The Ionic crystal generally fracture in __________
A. ductile manner
B. brittle manner
C. creep manner
D. fatigue manner
Question 8
The sensitivity of the fracture of the brittle solid to surface condition has been termed as the ____________
A. Bauschinger effect
B. Doppler effect
C. Joffe effect
D. Polarity effect
Question 9
The statement of Griffith theory of brittle fracture says that “A crack will propagate when the decrease in elastic strain energy is at least equal to the energy required to create the new surface”.
A. True
B. false
Question 10
The tendency of brittle fracture increase on ___________
A. decreasing temperature and strain rate
B. increasing temperature and strain rate
C. decreasing temperature and increasing strain rate
D. increasing temperature and decreasing strain rate
Question 11
The theoretical cohesive strength of brittle material is approximately equal to ________
A. E
B. E/2
C. E/π
D. E/2π
Question 12
Which of the following is correct?
A. Trangranular crack: crack propagates through the grain
B. Intergranular crack: crack propagates through the grain
C. Trangranular crack: crack propagates along the grain boundary
D. Intergranular crack: crack propagates along the surface of the sample
Question 13
Which of the following statement is correct?
A. Crack inside the material of length 2c and surface crack length c will have some impact in reducing the strength of the material
B. Crack inside the material of length c, and surface crack length 2c will have the same effect on reducing the strength of the material
C. Crack inside the material of length 4c and surface crack length c will have an equal impact in reducing the strength of the material
D. Crack inside the material of length c, and surface crack length 4c will have same impact in reducing the strength of the material