MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Metallurgy knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The metal undergoing creep operates under only one creep mechanism at a time. |
| A. | True |
| B. | False |
| Answer» C. | |
| 2. |
The chief mechanism responsible for Coble creep is _____________ |
| A. | dislocation glide |
| B. | diffusional Creep |
| C. | dislocation creep |
| D. | grain boundary sliding |
| Answer» C. dislocation creep | |
| 3. |
The chief mechanism responsible for Nabarro-Herring creep is _____________ |
| A. | dislocation glide |
| B. | dislocation creep |
| C. | diffusional creep |
| D. | grain boundary sliding |
| Answer» D. grain boundary sliding | |
| 4. |
The diffusional creep is the chief mechanism activated in the stress range of ___________ |
| A. | /G > 10<sup>-2</sup> |
| B. | 10 > /G > 10<sup>-2</sup> |
| C. | 10<sup>-4</sup> < /G < 10<sup>-2</sup> |
| D. | /G < 10<sup>-4</sup> |
| Answer» E. | |
| 5. |
The dislocation creep mechanism is active in the region ___________, where is applied stress and G is shear modulus. |
| A. | /G > 10<sup>-2</sup> |
| B. | 10 > /G > 10<sup>-2</sup> |
| C. | 10<sup>-4</sup> < /G < 10<sup>-2</sup> |
| D. | /G < 10<sup>-4</sup> |
| Answer» D. /G < 10<sup>-4</sup> | |
| 6. |
The dislocation glide is one of the mechanisms responsible for creep of the metals. Its condition for dislocation mechanism is _______________ |
| A. | high stress |
| B. | low stress |
| C. | high temperature |
| D. | low temperature |
| Answer» B. low stress | |
| 7. |
The total strain in the material is 47 %. Find the approximate percentage of strain which is caused by grain boundary sliding in total deformation? |
| A. | 47% |
| B. | 40% |
| C. | 5% |
| D. | 0.01% |
| Answer» D. 0.01% | |
| 8. |
The grain boundary sliding is promoted by increasing ____________ and decreasing ___________ |
| A. | temperature, strain rate |
| B. | strain rate, temperature |
| C. | temperature, stress |
| D. | stress, temperature |
| Answer» B. strain rate, temperature | |
| 9. |
The grain boundary sliding is a shear process occurring along the ________ |
| A. | direction of the grain boundary |
| B. | perpendicular direction of the grain boundary |
| C. | outward plane of the grain boundary |
| D. | inward plane of the grain boundary |
| Answer» B. perpendicular direction of the grain boundary | |
| 10. |
The material with low stacking fault energy is prone to sub-grain formation compared to the metal with high stacking fault energy. |
| A. | True |
| B. | False |
| Answer» C. | |