MCQOPTIONS
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MCQOPTIONS
This section includes 16 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Behaviour knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
When dislocation glide is assisted by vacancy diffusion, resulting creep is known as ___________ creep. |
| A. | Coble |
| B. | Dislocation |
| C. | Diffusion |
| D. | Nabarro-Herring |
| Answer» C. Diffusion | |
| 2. |
P-N stress is the ___________ obstacle. |
| A. | Athermal |
| B. | Long range |
| C. | Thermal |
| D. | Kinetic |
| Answer» D. Kinetic | |
| 3. |
Which of the following is an athermal obstacle? |
| A. | Forest dislocations |
| B. | Cross slip |
| C. | Climb |
| D. | Second phase particles |
| Answer» E. | |
| 4. |
WHICH_OF_THE_FOLLOWING_IS_AN_ATHERMAL_OBSTACLE??$ |
| A. | Forest dislocations |
| B. | Cross slip |
| C. | Climb |
| D. | Second phase particles |
| Answer» E. | |
| 5. |
When dislocation glide is assisted by vacancy diffusion, resulting creep is known as ___________ creep.$ |
| A. | Coble |
| B. | Dislocation |
| C. | Diffusion |
| D. | Nabarro-Herring |
| Answer» C. Diffusion | |
| 6. |
P-N stress is the ___________ obstacle.$ |
| A. | Athermal |
| B. | Long range |
| C. | Thermal |
| D. | Kinetic |
| Answer» D. Kinetic | |
| 7. |
Motion of jogs is the athermal obstacle. |
| A. | True |
| B. | False |
| Answer» C. | |
| 8. |
In ultra-fine grain polycrystalline metal, grain boundary sliding is predominant. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
Which of the following is a thermal obstacle? |
| A. | Dislocation on parallel slip planes |
| B. | Incoherent precipitate |
| C. | Climb of edge dislocations |
| D. | Second phase particles |
| Answer» D. Second phase particles | |
| 10. |
Normalized stress is the ratio of applied stress and ___________ |
| A. | Bulk modulus |
| B. | Shear modulus |
| C. | Strain |
| D. | Strain rate |
| Answer» C. Strain | |
| 11. |
___________ dominates at all temperatures but above the normalized stress of 10-2. |
| A. | Coble creep |
| B. | Nabarro-Herring creep |
| C. | Dislocation creep |
| D. | Dislocation glide |
| Answer» E. | |
| 12. |
P-N stress is low for ___________ structure. |
| A. | FCC |
| B. | BCC |
| C. | BCT |
| D. | SC |
| Answer» B. BCC | |
| 13. |
Co-base superalloys can sustain temperature ___________ |
| A. | 500-600 °C |
| B. | 600-740 °C |
| C. | 700-1040 °C |
| D. | 1000-2040 °C |
| Answer» D. 1000-2040 ¬¨¬®‚Äö√†√ªC | |
| 14. |
_________ provides oxidation resistance in Ni-base superalloys. |
| A. | Mo |
| B. | Ta |
| C. | Al |
| D. | W |
| Answer» D. W | |
| 15. |
___________ impart hot corrosion resistance in Ni-base superalloys. |
| A. | Cr |
| B. | Ti |
| C. | Mo |
| D. | Ta |
| Answer» C. Mo | |
| 16. |
Co is added in Ni-base alloy so as to increase ___________ temperature. |
| A. | Melting |
| B. | Boiling |
| C. | ϒ’ solvus |
| D. | Recrystallization |
| Answer» D. Recrystallization | |