MCQOPTIONS
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MCQOPTIONS
This section includes 12 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. |
The dislocation bowing decreases with increasing applied stress. |
| A. | True |
| B. | False |
| Answer» C. | |
| 2. |
Frank-Read source is a mechanism of dislocation multiplication. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3. |
Which of the following term is used to refer to the immobile pinning sites in the Frank-Read source? |
| A. | Nodal points |
| B. | Pin points |
| C. | Frank points |
| D. | Shear points |
| Answer» B. Pin points | |
| 4. |
Which factor is not a reason of Frank-Read source immobile pinning sites? |
| A. | Other solute atoms |
| B. | Second phase particles |
| C. | Solvent atoms |
| D. | Intersection with other dislocations |
| Answer» D. Intersection with other dislocations | |
| 5. |
The stress required for the generation of dislocation through Frank-Read source is inversely proportional to _____ |
| A. | shear modulus |
| B. | burgers vector |
| C. | distance between the pinning sites |
| D. | p-n stress |
| Answer» D. p-n stress | |
| 6. |
Dislocations generate on _____ under applied stress. |
| A. | every plane |
| B. | slip planes |
| C. | planes with Frank-Read source |
| D. | {1 1 1} planes |
| Answer» D. {1 1 1} planes | |
| 7. |
Higher dislocation density ____ yield strength of the metal. |
| A. | increases |
| B. | decreases |
| C. | doesn t affect |
| D. | can increase or decrease |
| Answer» B. decreases | |
| 8. |
Which metals can be cold worked to the largest extent? |
| A. | FCC |
| B. | BCC |
| C. | HCP |
| D. | SC |
| Answer» B. BCC | |
| 9. |
What is the density of dislocations in heavily deformed crystal? |
| A. | 10<sup>8</sup>-10<sup>10</sup> m<sup>-2</sup> |
| B. | 10<sup>10</sup>-10<sup>12</sup> m<sup>-2</sup> |
| C. | 10<sup>12</sup>-10<sup>14</sup> m<sup>-2</sup> |
| D. | 10<sup>14</sup>-10<sup>16</sup> m<sup>-2</sup> |
| Answer» E. | |
| 10. |
What is density of dislocations in annealed crystal? |
| A. | 10<sup>8</sup>-10<sup>10</sup> m<sup>-2</sup> |
| B. | 10<sup>10</sup>-10<sup>12</sup> m<sup>-2</sup> |
| C. | 10<sup>12</sup>-10<sup>14</sup> m<sup>-2</sup> |
| D. | 10<sup>14</sup>-10<sup>16</sup> m<sup>-2</sup> |
| Answer» C. 10<sup>12</sup>-10<sup>14</sup> m<sup>-2</sup> | |
| 11. |
The density of dislocations increases by an order of ____ in magnitude during deformation. |
| A. | 2-4 |
| B. | 6-7 |
| C. | 8-9 |
| D. | 12-13 |
| Answer» B. 6-7 | |
| 12. |
The stress required to activate the longest Frank-Read source would be _____ and _____ on the crystal structure. |
| A. | large, depends |
| B. | large, doesn t depend |
| C. | small, depends |
| D. | small, doesn t depend |
| Answer» D. small, doesn t depend | |