MCQOPTIONS
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MCQOPTIONS
This section includes 13 Mcqs, each offering curated multiple-choice questions to sharpen your Phase Transformation knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The interfacial energies of semi coherent interfaces are generally in the range of_______ (approximately) |
| A. | 0-200 mJm<sup>-2</sup> |
| B. | 200-500 mJm<sup>-2</sup> |
| C. | 500-1000 mJm<sup>-2</sup> |
| D. | 10000 mJm<sup>-2</sup> |
| Answer» D. 10000 mJm<sup>-2</sup> | |
| 2. |
The degree of coherency can be greatly increased if_______ |
| A. | Macroscopically irrational interface is formed |
| B. | Microscopically rational interface is formed |
| C. | Macroscopically rational interface is formed |
| D. | Microscopically irrational interface is formed |
| Answer» B. Microscopically rational interface is formed | |
| 3. |
Incoherent interface can also exist between crystals with an orientation relationship if the interface has a different structure in the two crystals. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 4. |
When the value of ( ) misfit is greater than 0.25, the kind of interface is known as _________ |
| A. | Coherent interface |
| B. | Mixed interface |
| C. | Semi coherent interface |
| D. | Incoherent interface |
| Answer» E. | |
| 5. |
For small values of misfit , the structural contribution to the interfacial energy is approximately proportional to the____ (Semi coherent interface). |
| A. | Size and shape of dislocation |
| B. | Density of dislocation |
| C. | Texture |
| D. | Position of dislocation |
| Answer» E. | |
| 6. |
The interfacial energy of a semi coherent interface can be approximately considered as the sum of two parts. What are they? |
| A. | Chemical and structural contribution |
| B. | Chemical and bulk contribution |
| C. | Magnetic contribution and structural |
| D. | Physical and bulk contribution |
| Answer» E. | |
| 7. |
A spacing D can be used to completely accommodate the lattice misfit in the one direction without any long-range strain field by a set of edge location. Calculate the value of D if the interplanar spacing s of matching planes are given as 20mm, 19mm respectively? (Assume the misfit to be very small) |
| A. | 390mm |
| B. | 240mm |
| C. | 795mm |
| D. | 800mm |
| Answer» B. 240mm | |
| 8. |
Assume that 5mm and 5mm are the unstressed interplanar spacing s of matching planes in the and phases respectively, the disregistry, or misfit between the two lattices ( ) is defined by__ |
| A. | 0 |
| B. | 0.5 |
| C. | 1 |
| D. | 2 |
| Answer» B. 0.5 | |
| 9. |
In a semi coherent interface, the disregistry is periodically taken up by _________ |
| A. | Coarsened structure |
| B. | Proper fit |
| C. | Misfit dislocations |
| D. | Cross dislocation |
| Answer» D. Cross dislocation | |
| 10. |
In which among the following case there is only one plane that can form a coherent interface? |
| A. | Simple cubic |
| B. | BCC |
| C. | Edge centered lattice |
| D. | HCP |
| Answer» E. | |
| 11. |
The resultant lattice distortion to maintain the coherency is known as__ |
| A. | Strain rupture |
| B. | Coherency strain |
| C. | Rupture plane |
| D. | Maintenance plane |
| Answer» C. Rupture plane | |
| 12. |
Within the bulk of each phase every atom has an optimum arrangement of nearest neighbours that produces a low energy. At the interface, however, there is usually a change in composition so that each atom is partly bonded to wrong neighbours across the interface. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 13. |
HCP silicon-rich k phase and the FCC copper-rich -matrix in Cu-Si alloys forms ___ |
| A. | A coherent interface |
| B. | An incoherent interface |
| C. | Mixed interface |
| D. | A semi coherent interface |
| Answer» E. | |