MCQOPTIONS
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MCQOPTIONS
This section includes 10 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 shortest repeat-distance is aligned parallel to the direction of diffusion (fiber texture). This statement is known as____ |
| A. | Perkin rule |
| B. | Thumb rule |
| C. | Henrys rule |
| D. | Marks direction principle |
| Answer» C. Henrys rule | |
| 2. |
If a single crystalline layer of is growing between single crystalline substrate and , one might expect a completely_____ |
| A. | Straight / and / interfaces |
| B. | Curved / and / interfaces |
| C. | Straight / and / interfaces |
| D. | Curved / and / interfaces |
| Answer» B. Curved / and / interfaces | |
| 3. |
The direction of the longest crystallographic axis is invariably oriented __________ |
| A. | Parallel to diffusion direction |
| B. | Perpendicular to interface |
| C. | Perpendicular to diffusion direction |
| D. | Cannot be predicted |
| Answer» D. Cannot be predicted | |
| 4. |
Accurate microbe analysis near the interfaces are very difficult if the fluorescent effect affects the concentration measurements at distance as large as 40*10-6m from the interface. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 5. |
The flux of atoms to the interface balance the________ |
| A. | Rate of accumulation due to the boundary migration |
| B. | Mass of the system |
| C. | Volume of the system |
| D. | Stability of the grain boundary |
| Answer» B. Mass of the system | |
| 6. |
Under some circumstances the interface migration is said to be interface controlled. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7. |
Which among the following can give an extra information on layer growth mechanism and concentration limit of various phases? |
| A. | Edges and free surface of diffusion couple |
| B. | Positions of dislocation |
| C. | Composition ratio |
| D. | Shape of the interface |
| Answer» B. Positions of dislocation | |
| 8. |
If the diffusion couple technique is not used in a proper way which of the following error is most likely to occur? |
| A. | The necessity to use the decremented couples |
| B. | Small roles played by impurities |
| C. | Steep concentration gradient may occur in the growing phases |
| D. | No errors are likely to occur |
| Answer» D. No errors are likely to occur | |
| 9. |
Non equilibrium diffusion couples, a situation often encountered at ________ |
| A. | High temperature |
| B. | Low temperature |
| C. | When nucleation is perfect |
| D. | Annealing time is too long |
| Answer» D. Annealing time is too long | |
| 10. |
Which of the following is an example of Diffusion in multi-phase binary system? |
| A. | Alcohol in water |
| B. | Aldehyde in water |
| C. | Ketone in water |
| D. | Galvanized iron and hot-dipped tin plate |
| Answer» E. | |