MCQOPTIONS
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MCQOPTIONS
This section includes 17 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Behaviour knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Retained austenite can be eliminated by tempering. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
Martensitic transformation is an irreversible transformation only. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
What is habit plane for medium carbon steel for martensitic transformation? |
| A. | (1 1 1) |
| B. | (1 0 0) |
| C. | (2 2 5) |
| D. | (2 5 9) |
| Answer» D. (2 5 9) | |
| 4. |
Retained austenite is sometimes desirable because it ______ |
| A. | Lowers hardness |
| B. | Is nonmagnetic |
| C. | Provide dimensional stability |
| D. | Control strength |
| Answer» D. Control strength | |
| 5. |
Amount of retained austenite _______ with an increase in the amount of carbon in martensite. |
| A. | Increases linearly |
| B. | Decreases |
| C. | Remains constant |
| D. | Increases nonlinearly |
| Answer» E. | |
| 6. |
Which alloying element enhances the Ms temperature? |
| A. | Al |
| B. | Ni |
| C. | Mo |
| D. | Cr |
| Answer» B. Ni | |
| 7. |
RETAINED_AUSTENITE_IS_SOMETIMES_DESIRABLE_BECAUSE_IT_______?$ |
| A. | Lowers hardness |
| B. | Is nonmagnetic |
| C. | Provide dimensional stability |
| D. | Control strength |
| Answer» D. Control strength | |
| 8. |
Martensitic transformation is irreversible transformation.$ |
| A. | True |
| B. | False |
| Answer» C. | |
| 9. |
What_is_habit_plane_for_medium_carbon_steel_for_martensitic_transformation?$ |
| A. | (1 1 1) |
| B. | (1 0 0) |
| C. | (2 2 5) |
| D. | (2 5 9) |
| Answer» D. (2 5 9) | |
| 10. |
Retained_austenite_can_be_eliminated_by_tempering. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 11. |
Amount of retained austenite _______ with an increase in the amount of carbon in martensite? |
| A. | Increases linearly |
| B. | Decreases |
| C. | Remains constant |
| D. | Increases nonlinearly |
| Answer» E. | |
| 12. |
Ms temperature depends on ______ and Mf temperature depends on ______ |
| A. | Cooling rate, composition |
| B. | Composition, cooling rate |
| C. | Cooling rate, austenite grain size |
| D. | Cooling rate, cooling rate |
| Answer» C. Cooling rate, austenite grain size | |
| 13. |
Which alloying element increases the Ms temperature? |
| A. | Cu |
| B. | Co |
| C. | Cr |
| D. | Mn |
| Answer» C. Cr | |
| 14. |
With an increase in carbon content, hardness of martensite ____ |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | First increases then decrease |
| Answer» B. Decreases | |
| 15. |
Martensitic transformation is _____ |
| A. | Diffusion less |
| B. | Long range diffusion of atoms |
| C. | Strain less |
| D. | Second order transformation |
| Answer» B. Long range diffusion of atoms | |
| 16. |
The major strengthening due to martensite transformation is caused by ______ |
| A. | Solid solution strengthening |
| B. | Lattice distortion |
| C. | Dislocation hardening |
| D. | Precipitation hardening |
| Answer» C. Dislocation hardening | |
| 17. |
What is the dislocation density of lath martensite? |
| A. | 10<sup>6</sup>-10<sup>8</sup> cm<sup>-2</sup> |
| B. | 10<sup>8</sup>-10<sup>10</sup> cm<sup>-2</sup> |
| C. | 10<sup>10</sup>-10<sup>12</sup> cm<sup>-2</sup> |
| D. | 10<sup>12</sup>-10<sup>14</sup> cm<sup>-2</sup> |
| Answer» D. 10<sup>12</sup>-10<sup>14</sup> cm<sup>-2</sup> | |