MCQOPTIONS
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MCQOPTIONS
This section includes 11 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. |
According to the model based on atomic mobility (as suggested by Darken in the year 1950), if a system has 3 mobilities then the number of independent coefficients is given by_____ |
| A. | 6 |
| B. | 5 |
| C. | 3 |
| D. | 2 |
| Answer» D. 2 | |
| 2. |
If a system has 3 components, the number of independent coefficients present if we utilize the ORR is given by____________ |
| A. | 3 |
| B. | 6 |
| C. | 2 |
| D. | 4 |
| Answer» B. 6 | |
| 3. |
What was the new feature introduced in the study of diffusion by Onsager? |
| A. | Barrel effect |
| B. | Cross effect |
| C. | Multi phase effect |
| D. | Side effect |
| Answer» C. Multi phase effect | |
| 4. |
In order to describe the transport process in a ternary diffusion system, we need 4 inter-diffusion coefficients. Why? |
| A. | Doppler principle |
| B. | Catherine cross diagonal |
| C. | Linear extension of ficks law |
| D. | Shear pressure |
| Answer» D. Shear pressure | |
| 5. |
Who made the extension of Fick s law to multicomponent system in the year 1945? |
| A. | Onsager |
| B. | Kirkland |
| C. | Brown |
| D. | Raoult |
| Answer» B. Kirkland | |
| 6. |
Which of the following relate the flux of one component to the composition gradient of the other independent constituent in ternary system? |
| A. | Off-diagonal |
| B. | Side-diagonal |
| C. | Triangle rule |
| D. | Fick s law |
| Answer» B. Side-diagonal | |
| 7. |
In ternary alloy systems, because of the additional degree of freedom in the composition we may see composition profile which do not change monotonically through solid solution ranges and stable non- planar phase interfaces. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
Less striking effects can arise in ternary systems where all three components diffuse substitutionally if their diffusivities (or mobilities) are unequal. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
The inter-diffusion flux for a multicomponent system can be calculated using____ |
| A. | Matano-Boltzmann analysis |
| B. | Henry s laws |
| C. | Raoult s Equation |
| D. | Perkins equation |
| Answer» D. Perkins equation | |
| 10. |
In Fe-Si-C alloys, why does carbon diffuse far more rapidly than the substitutionally dissolved silicon? |
| A. | Because it is large in size |
| B. | Because it has more mass |
| C. | Because it is an interstitial solute |
| D. | Because it is more volatile |
| Answer» D. Because it is more volatile | |
| 11. |
The addition of a third diffusing species to a solid solution produces some effects. Fe-Si-C alloys are particularly instructive for some reasons. Which among the following is a reason for the above-mentioned statement? |
| A. | Carbon raises the chemical potential of silicon |
| B. | Silicon raises the chemical potential of carbon |
| C. | Ferrous becomes inactive |
| D. | Mobility of carbon and silicon are almost same |
| Answer» C. Ferrous becomes inactive | |