MCQOPTIONS
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MCQOPTIONS
This section includes 15 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. |
Calculate the driving force at temperature 300K if the value of Xi (Concentration adjacent to the interface) and Xe (equilibrium concentration) are given as 4mols and 2mols respectively? |
| A. | 300Rln3 |
| B. | 300Rln2 |
| C. | 150Rln2 |
| D. | 150Rln3 |
| Answer» C. 150Rln2 | |
| 2. |
Growth ledges are by no means restricted to solid/solid systems. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3. |
If a single atom attaches itself to a flat close-packed interface it will raise the interfacial free energy. |
| A. | False |
| B. | True |
| Answer» C. | |
| 4. |
The accommodation factor (A) at the incoherent interfaces and diffuse solid/liquid interfaces can be close to________ |
| A. | 0 |
| B. | 1 |
| C. | 0.5 |
| D. | 6 |
| Answer» C. 0.5 | |
| 5. |
What happens to the driving force , when Xi (Concentration adjacent to the interface) approaches Xe (equilibrium concentration)? (For a dilute or ideal solution) |
| A. | =0 |
| B. | >0 |
| C. | <0 |
| D. | cannot be predicted |
| Answer» B. >0 | |
| 6. |
In the limit of a very low mobility it is possible that ____ |
| A. | ( C/ x) interface = 0 |
| B. | ( C/ x) interface > 0 |
| C. | ( C/ x) interface < 0 |
| D. | ( C/ x) interface = 1 |
| Answer» B. ( C/ x) interface > 0 | |
| 7. |
If we consider a precipitate of an almost pure metal B with Interface mobility given as M, Molar volume V of the phase, and the driving force is given as . Calculate the flux across the interface? |
| A. | J = M /V |
| B. | J = -M /V |
| C. | J = -M /V |
| D. | J = M /V |
| Answer» D. J = M /V | |
| 8. |
Just for a simplicity consider a pure substance B. By analogy with the migration of a high-angle grain boundary the net flux of B across the interface will produce an interface velocity v given by____(Interface mobility is given as M, Molar volume V, and the driving force is given as ) |
| A. | M /V |
| B. | M +V |
| C. | M/ *V |
| D. | MV/ |
| Answer» B. M +V | |
| 9. |
Martensitic transformations belongs to____ |
| A. | Base transformation |
| B. | Civilian transformation |
| C. | Military transformation |
| D. | Mixed transformation |
| Answer» D. Mixed transformation | |
| 10. |
During civilian transformations the parent and product will have _____ (Composition). |
| A. | Same composition |
| B. | Different composition |
| C. | Time dependent composition |
| D. | Nothing can be predicted |
| Answer» E. | |
| 11. |
Civilian transformation is a phenomenon that occurs when the uncoordinated transfer of atoms occurs across a____________ |
| A. | Glissile interface |
| B. | Mixed interface |
| C. | Partially coherent interface |
| D. | Non-Glissile interface |
| Answer» E. | |
| 12. |
The migration of which among the following interfaces is extremely sensitive to temperature? |
| A. | Mixed |
| B. | Corrupted |
| C. | Glissile |
| D. | Non-Glissile |
| Answer» E. | |
| 13. |
Athermal migration is related to which of the following interface? |
| A. | Mixed |
| B. | Corrupted |
| C. | Non-Glissile |
| D. | Glissile |
| Answer» E. | |
| 14. |
Most of the transformation products are formed during the growth stage by the_____ |
| A. | Transfer of atoms across the moving parent/product interface |
| B. | Movement of atoms in the formed nuclei |
| C. | Nucleation |
| D. | Random oscillation of parent particle |
| Answer» B. Movement of atoms in the formed nuclei | |
| 15. |
In a way we can say that an interface is created during the____ |
| A. | Nucleation |
| B. | Destruction |
| C. | Vibration |
| D. | Growth |
| Answer» B. Destruction | |