MCQOPTIONS
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MCQOPTIONS
This section includes 9 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 strain rate sensitivity (m) in the superplastic material is __________ |
| A. | 0 |
| B. | 1 |
| C. | 0.5 |
| D. | 10 |
| Answer» D. 10 | |
| 2. |
The grain shape in the superplastic material is generally __________ and remains ___________ even after deformation. |
| A. | elongated, equiaxial |
| B. | acicular, elongated |
| C. | equiaxial, equiaxial |
| D. | irregular, elongated |
| Answer» D. irregular, elongated | |
| 3. |
The superplasticity is reduced by the presence of the second phase particle in the matrix. |
| A. | True |
| B. | False |
| Answer» C. | |
| 4. |
The applied flow stress to cause the superplasticity of the material has to be ___________ |
| A. | very large |
| B. | large |
| C. | small |
| D. | very small |
| Answer» E. | |
| 5. |
The two necessary conditions for superplasticity is higher temperature and low strain rate of deformation. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6. |
The creep deformation rate of gamma iron is higher than alpha iron because the gamma iron is high-temperature phase. |
| A. | True |
| B. | False |
| Answer» C. | |
| 7. |
The activation energy of creep for a pure metal at high temperature is equal to activation energy of _____________ |
| A. | interstitial diffusion |
| B. | substitutional diffusion |
| C. | self-diffusion |
| D. | grain growth |
| Answer» D. grain growth | |
| 8. |
If the strain rate on the material increases, the Coble creep region of the creep map will _________ |
| A. | increase and the curve will shift upwards |
| B. | increase and the curve will shift towards the right |
| C. | decrease and the curve will shift downwards |
| D. | decreases and the curve will shift towards left |
| Answer» C. decrease and the curve will shift downwards | |
| 9. |
The following creep map is plotted with homologous stress and temperature, as shown in the region.
|
| A. | n<a href="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-creep-stress-rupture-creep-deformation-mechanism-2-q1.png"><img alt="Coble creep region by region I for creep map is with homologous stress & temperature" class="alignnone size-full wp-image-266013" height="331" sizes="(max-width: 449px) 100vw, 449px" src="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-creep-stress-rupture-creep-deformation-mechanism-2-q1.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-creep-stress-rupture-creep-deformation-mechanism-2-q1.png 449w, https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-creep-stress-rupture-creep-deformation-mechanism-2-q1-300x221.png 300w" width="449"/></a> |
| B. | I |
| C. | II |
| D. | III |
| E. | IV |
| Answer» E. IV | |