MCQOPTIONS
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MCQOPTIONS
This section includes 13 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. |
Determine whether dislocation reaction is feasible or not?
|
| A. | na/6[0 1 1]->a/6[1 2 -1]+a/6[-1 -1 2] |
| B. | Reaction is not balanced and not feasible |
| C. | Reaction is balanced but not feasible |
| D. | Reaction not balance but feasible |
| E. | Reaction is balanced and feasible |
| Answer» C. Reaction is balanced but not feasible | |
| 2. |
Strain energy of dislocation with burger vector (b) is proportional to ______ |
| A. | b |
| B. | b<sup>2</sup> |
| C. | b<sup>3</sup> |
| D. | b<sup>1/2</sup> |
| Answer» C. b<sup>3</sup> | |
| 3. |
Is it possible to have dislocation with strength larger than the dislocation of unit strength? |
| A. | True |
| B. | False |
| Answer» C. | |
| 4. |
A dislocation with burger vector equal to one lattice spacing is said to be a dislocation of __________ |
| A. | unit strength |
| B. | perfect edge |
| C. | ideal screw |
| D. | universal lattice |
| Answer» B. perfect edge | |
| 5. |
Which of the following diagram is the correct representation of the dislocation loop? |
| A. | <a href="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-burger-vector-dislocation-loop-q9a.png"><img alt="The following diagram is the correct representation of the dislocation loop - option a" class="alignnone size-full wp-image-265636" height="194" sizes="(max-width: 456px) 100vw, 456px" src="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-burger-vector-dislocation-loop-q9a.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-burger-vector-dislocation-loop-q9a.png 456w, https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-burger-vector-dislocation-loop-q9a-300x128.png 300w" width="456"/></a> |
| B. | <a href="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-burger-vector-dislocation-loop-q9b.png"><img alt="The following diagram is the correct representation of the dislocation loop - option b" class="alignnone size-full wp-image-265635" height="179" sizes="(max-width: 451px) 100vw, 451px" src="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-burger-vector-dislocation-loop-q9b.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-burger-vector-dislocation-loop-q9b.png 451w, https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-burger-vector-dislocation-loop-q9b-300x119.png 300w" width="451"/></a> |
| C. | <a href="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-burger-vector-dislocation-loop-q9c.png"><img alt="The following diagram is the correct representation of the dislocation loop - option c" class="alignnone size-full wp-image-265634" height="174" sizes="(max-width: 468px) 100vw, 468px" src="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-burger-vector-dislocation-loop-q9c.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-burger-vector-dislocation-loop-q9c.png 468w, https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-burger-vector-dislocation-loop-q9c-300x112.png 300w" width="468"/></a> |
| D. | <a href="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-burger-vector-dislocation-loop-q9d.png"><img alt="The following diagram is the correct representation of the dislocation loop - option d" class="alignnone size-full wp-image-265633" height="189" sizes="(max-width: 455px) 100vw, 455px" src="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-burger-vector-dislocation-loop-q9d.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-burger-vector-dislocation-loop-q9d.png 455w, https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-burger-vector-dislocation-loop-q9d-300x125.png 300w" width="455"/></a> |
| Answer» D. <a href="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-burger-vector-dislocation-loop-q9d.png"><img alt="The following diagram is the correct representation of the dislocation loop - option d" class="alignnone size-full wp-image-265633" height="189" sizes="(max-width: 455px) 100vw, 455px" src="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-burger-vector-dislocation-loop-q9d.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-burger-vector-dislocation-loop-q9d.png 455w, https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-burger-vector-dislocation-loop-q9d-300x125.png 300w" width="455"/></a> | |
| 6. |
It is possible that the dislocation will end inside the crystal without interacting with free surface or forming dislocation loop. |
| A. | True |
| B. | False |
| Answer» C. | |
| 7. |
The Burgers vector b is the vector which defines the magnitude and direction of slip. For a pure edge dislocation, the Burgers vector is perpendicular to the dislocation line, while for a pure screw dislocation, the Burgers vector is parallel to the dislocation line. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
Which of the given characterization techniques has the highest resolution? |
| A. | X-ray microscopy |
| B. | Optical microscopy |
| C. | Scanning electron microscopy |
| D. | Field ion microscopy |
| Answer» E. | |
| 9. |
Which of the following phenomena is not associated with dislocation? |
| A. | Stacking fault |
| B. | Lomer-Cottrell barrier |
| C. | Frank-reed source |
| D. | Pourbix curve |
| Answer» E. | |
| 10. |
The thickness of the analysis sample used in the Transmission electron microscope is in order of ______ |
| A. | meters |
| B. | millimeters |
| C. | micrometers |
| D. | nanometres |
| Answer» E. | |
| 11. |
The method of detecting dislocations by forming a visible precipitate along the dislocation lines is known as ____________ the small amount of impurity is intensely added to form the precipitate after heat treatment. |
| A. | decoration |
| B. | etching |
| C. | trimming |
| D. | dressing |
| Answer» B. etching | |
| 12. |
Etch pit technique of dislocation detection is based on ___________ |
| A. | chemical method |
| B. | physical Method |
| C. | mechanical method |
| D. | analytical method |
| Answer» B. physical Method | |
| 13. |
Single Dislocation can be physically seen with ________________ |
| A. | optical microscope |
| B. | x-ray diffraction |
| C. | scanning electron microscope |
| D. | transmission electron microscope |
| Answer» E. | |