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. |
Two edge dislocation of opposite sign lies in parallel slip angle with an angle of 55 degrees with each other. What will the nature of force between these two dislocations? |
| A. | Attractive |
| B. | Repulsive |
| C. | Neither attractive nor repulsive |
| D. | Cannot predict with given information |
| Answer» C. Neither attractive nor repulsive | |
| 2. |
Two edge dislocation of same sign lies in parallel slip angle with an angle of 30 degrees with each other. What will the nature of force between these two dislocations? |
| A. | Attractive |
| B. | Repulsive |
| C. | Neither attractive nor repulsive |
| D. | Cannot predict with given information |
| Answer» C. Neither attractive nor repulsive | |
| 3. |
No Diffusion of atom is needed to allow ____________ to move from one plane to another plane. |
| A. | edge dislocation |
| B. | screw dislocation |
| C. | jog |
| D. | kink |
| Answer» C. jog | |
| 4. |
Dislocation climb is temperature dependent phenomena and present in both edge and screw dislocation. |
| A. | True |
| B. | False |
| Answer» C. | |
| 5. |
The activation for the climb is equal to _____where;Uj = Activation for nucleation of jogUv = Activation for formation of the vacancyUm = Activation for formation of the self diffusionUi = Activation for formation of the interstitial diffusion |
| A. | Uj+Uv+Um |
| B. | Uj |
| C. | Uj+Uv |
| D. | Uj+Uv+Um+Ui |
| Answer» B. Uj | |
| 6. |
It is commonly observed that climb generate jog in dislocation line because ________ |
| A. | dislocation climb creates stress in dislocation line to bend it |
| B. | the extra plane of atoms is highly unlikely to remove from the entire width of dislocation |
| C. | a jog is a form of dislocation climb |
| D. | statement is incorrect |
| Answer» C. a jog is a form of dislocation climb | |
| 7. |
The dislocation climb is least affected by ___________ |
| A. | movement of the atom to dislocation |
| B. | movement of vacancy to the dislocation |
| C. | shear stress |
| D. | high Temperature |
| Answer» D. high Temperature | |
| 8. |
Which of the following is a non-conservative type of movement of dislocation? |
| A. | The glide of positive edge dislocation on the slip plane |
| B. | The glide of positive edge dislocation on the slip plane |
| C. | The glide of positive screw dislocation on the slip plane |
| D. | The climb of an edge dislocation |
| Answer» E. | |
| 9. |
A dislocation always feels the attractive force from the surface of the material. |
| A. | True |
| B. | False |
| Answer» C. | |
| 10. |
The stacking fault energy of aluminium is 200 mJ m-2. Find the equilibrium spacing between partial dislocation of aluminium. If the shear modulus of the material is 27 GPa and lattice parameter is 3.57 A°. |
| A. | 20 A° |
| B. | 1000 A° |
| C. | 1 A° |
| D. | 20 micron |
| Answer» B. 1000 A° | |