MCQOPTIONS
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MCQOPTIONS
This section includes 20 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. |
Below the equicohesive temperature, the strength of grain boundaries are higher than grains. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
Equicohesive temperature is twice that of recrystallization. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
Which process doesn’t occur at high temperature? |
| A. | Sub grain formation |
| B. | Recovery |
| C. | Recrystallization |
| D. | Slip and twinning |
| Answer» E. | |
| 4. |
With increasing strain rate, ECT _________ |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | First increases, then decrease |
| Answer» B. Decreases | |
| 5. |
Which of the following temperature is used to differentiate transgranular and intergranular modes of fracture? |
| A. | Recrystallization |
| B. | Equi-cohesive |
| C. | Curie |
| D. | Critical |
| Answer» C. Curie | |
| 6. |
Grain boundary ________ occurs at a high temperature causing an intergranular fracture. |
| A. | Gliding |
| B. | Strengthening |
| C. | Sliding |
| D. | Twinning |
| Answer» D. Twinning | |
| 7. |
At _________________ the grain boundaries of polycrystalline metals act as ________ for cracks. |
| A. | Low temperature, barrier |
| B. | High temperature, barrier |
| C. | High stress, barrier |
| D. | High stress, nucleation sites |
| Answer» B. High temperature, barrier | |
| 8. |
WITH_INCREASING_STRAIN_RATE,_ECT__________?$ |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | First increases, then decrease |
| Answer» B. Decreases | |
| 9. |
WHAT_TERM_IS_USED_FOR_THE_TEMPERATURE_AT_WHICH_FRACTURE_MODE_CHANGE??$ |
| A. | Recrystallization |
| B. | Equi-cohesive |
| C. | Curie |
| D. | Critical |
| Answer» C. Curie | |
| 10. |
Equicohesive temperature is twice that of recrystallization.$ |
| A. | True |
| B. | False |
| Answer» C. | |
| 11. |
Which process doesn’t occur at high temperature?$# |
| A. | Sub grain formation |
| B. | Recovery |
| C. | Recrystallization |
| D. | Slip and twinning |
| Answer» E. | |
| 12. |
Below the equicohesive temperature, the given boundaries are stronger. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 13. |
Grain boundary ________ occurs at a high temperature causing an intergranular fracture? |
| A. | Gliding |
| B. | Strengthening |
| C. | Sliding |
| D. | Twinning |
| Answer» D. Twinning | |
| 14. |
With an increase in temperature, the cohesiveness of grain boundary ________ |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | First increases, then decrease |
| Answer» C. Remains constant | |
| 15. |
Why grain boundaries become weak on high temperatures? |
| A. | Mobility of atoms |
| B. | Partial melting |
| C. | Dislocation pile up |
| D. | Substructure |
| Answer» B. Partial melting | |
| 16. |
Which temperature is more important for alloys? |
| A. | Melting temperature |
| B. | Boiling temperature |
| C. | Recrystallization temperature |
| D. | Sub-zero temperature |
| Answer» D. Sub-zero temperature | |
| 17. |
In polycrystalline metals at ________ grain boundaries act as ________ for cracks. |
| A. | Low temperature, barrier |
| B. | High temperature, barrier |
| C. | High stress, barrier |
| D. | High stress, nucleation sites |
| Answer» B. High temperature, barrier | |
| 18. |
A fracture through grain boundaries is _________ |
| A. | Trans granular |
| B. | Trans crystalline |
| C. | Cohesive |
| D. | Intergranular |
| Answer» E. | |
| 19. |
The fracture through grains is known as ________ |
| A. | Rupture |
| B. | Trans granular |
| C. | Inter crystalline |
| D. | Intergranular |
| Answer» C. Inter crystalline | |
| 20. |
At low temperature, metals under stress deform by ________ |
| A. | Slip and twin |
| B. | Softening |
| C. | Rupture |
| D. | Residual stresses |
| Answer» B. Softening | |