MCQOPTIONS
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MCQOPTIONS
This section includes 14 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?b1 = b2+ b3a/6[0 1 1]->a/6[1 2 -1]+a/6[-1 -1 2] |
| A. | Reaction is not balanced and not feasible |
| B. | Reaction is balanced but not feasible |
| C. | Reaction not balance but feasible |
| D. | Reaction is balanced and feasible |
| Answer» C. Reaction not balance but feasible | |
| 2. |
A dislocation with Burger vector b1 will dissociate into two partial dislocations of burger vector b2 and b3 respectively;b1 -> b2 + b3b1, b2, b3 are magnitude of burger vectors.So the reaction will occur only if __________ |
| A. | b1 > b2 + b3 |
| B. | b1 > b22 + b32 |
| C. | b12 > b22 + b32 |
| D. | b12 > b2 + b3 |
| Answer» D. b12 > b2 + b3 | |
| 3. |
Strain energy of dislocation with burger vector (b) is proportional to ______ |
| A. | b |
| B. | is proportional to ______a) bb) b2 |
| C. | b3 |
| D. | b1/2 |
| Answer» C. b3 | |
| 4. |
Is it possible to have dislocation with strength larger than the dislocation of unit strength? |
| A. | True |
| B. | False |
| Answer» C. | |
| 5. |
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 | |
| 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. |
Select the correct option: |
| A. | A – parallel to burger vector; B – parallel to burger vector; C – parallel; D – Perpendicular |
| B. | A – parallel to burger vector; B – perpendicular to burger vector; C – parallel; D – Perpendicular |
| C. | A – parallel to burger vector; B – parallel to burger vector; C – Perpendicular; D – parallel |
| D. | A – parallel to burger vector; B – perpendicular to burger vector; C – Perpendicular; D – parallelView Answer |
| Answer» B. A – parallel to burger vector; B – perpendicular to burger vector; C – parallel; D – Perpendicular | |
| 8. |
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 | |
| 9. |
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. | |
| 10. |
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. | |
| 11. |
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. | |
| 12. |
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 | |
| 13. |
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 | |
| 14. |
Single Dislocation can be physically seen with ________________ |
| A. | optical microscope |
| B. | x-ray diffraction |
| C. | scanning electron microscope |
| D. | transmission electron microscope |
| Answer» E. | |