 
			 
			MCQOPTIONS
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				This section includes 12 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. | Which of the following is not a favorable condition for the formation of mechanical twins? | 
| A. | The rapid rate of loading | 
| B. | Low temperature | 
| C. | BCC or HCP lattice | 
| D. | Higher temperature | 
| Answer» E. | |
| 2. | In slip, the orientation of the crystal above and below the slip plane is _________ after deformation as before. While twinning results in ___________ orientation across the twin plane. | 
| A. | same, different | 
| B. | different, same | 
| C. | same, same | 
| D. | different, different | 
| Answer» B. different, same | |
| 3. | Which two metal shows the significant strain hardening among Cu, Al, Mg, Zn? | 
| A. | Cu, Al | 
| B. | Mg, Zn | 
| C. | Cu, Mg | 
| D. | Al, Zn | 
| Answer» B. Mg, Zn | |
| 4. | The ratio of the resolved shear stress to the axial stress is called the Schmid factor m. | 
| A. | True | 
| B. | False | 
| Answer» B. False | |
| 5. | How the addition of impurity in pure metal affects the critical solved shear stress? | 
| A. | Increases | 
| B. | decreases | 
| C. | Remains unaffected | 
| D. | Cannot be predicted | 
| Answer» B. decreases | |
| 6. | The highest value of the critical resolved shear stress will be obtained in which of the following case? | 
| A. | <a href="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-plastic-deformation-single-crystal-critical-resolved-shear-stress-q7a.png"><img alt="The highest value of the critical resolved shear stress will be obtained - option a" class="alignnone size-full wp-image-265609" height="268" src="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-plastic-deformation-single-crystal-critical-resolved-shear-stress-q7a.png" width="160"/></a> | 
| B. | <a href="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-plastic-deformation-single-crystal-critical-resolved-shear-stress-q7b.png"><img alt="The highest value of the critical resolved shear stress will be obtained - option b" class="alignnone size-full wp-image-265608" height="270" src="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-plastic-deformation-single-crystal-critical-resolved-shear-stress-q7b.png" width="161"/></a> | 
| C. | <a href="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-plastic-deformation-single-crystal-critical-resolved-shear-stress-q7c.png"><img alt="The highest value of the critical resolved shear stress will be obtained - option c" class="alignnone size-full wp-image-265607" height="268" src="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-plastic-deformation-single-crystal-critical-resolved-shear-stress-q7c.png" width="159"/></a> | 
| D. | <a href="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-plastic-deformation-single-crystal-critical-resolved-shear-stress-q7d.png"><img alt="The highest value of the critical resolved shear stress will be obtained - option d" class="alignnone size-full wp-image-265606" height="351" sizes="(max-width: 161px) 100vw, 161px" src="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-plastic-deformation-single-crystal-critical-resolved-shear-stress-q7d.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-plastic-deformation-single-crystal-critical-resolved-shear-stress-q7d.png 161w, https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-plastic-deformation-single-crystal-critical-resolved-shear-stress-q7d-138x300.png 138w" width="161"/></a> | 
| Answer» E. | |
| 7. | Determine the tensile stress that is applied along the [1-10] axis of a silver crystal to cause slip on the (1-1-1) [0-11] system. The critical resolved shear stress is 10 MPa. | 
| A. | 10 | 
| B. | 10 2 | 
| C. | 10 6 | 
| D. | 10/ 6 | 
| Answer» D. 10/ 6 | |
| 8. | Determine the angle between the [110] axis of a copper crystal with (11-1)[0-11] slip system? | 
| A. | 35.26 and 30 | 
| B. | 30 and 60 | 
| C. | 30 and 45 | 
| D. | 60 and 35.26 | 
| Answer» B. 30 and 60 | |
| 9. | Slip begins when the shearing stress on the slip plane in the slip direction reaches a threshold value called the critical resolved shear stress. | 
| A. | True | 
| B. | False | 
| Answer» B. False | |
| 10. | Shear strain rate is equal to _____ | 
| A. | b x | 
| B. | b v | 
| C. | v | 
| D. | bv | 
| Answer» C. v | |
| 11. | Find the shear strain in the material if the burger vector of dislocation is 0.1nm, average distance moved by dislocation is 1 micron, and dislocation density is 108 m-2? | 
| A. | 10 | 
| B. | 10<sup>8</sup> | 
| C. | 10<sup>-8</sup> | 
| D. | 10<sup>-10</sup> | 
| Answer» C. 10<sup>-8</sup> | |
| 12. | The unit of dislocation density is ___________ | 
| A. | m | 
| B. | m<sup>2</sup> | 
| C. | m<sup>-2</sup> | 
| D. | m<sup>3</sup> | 
| Answer» D. m<sup>3</sup> | |