MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Materials Metallurgy knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Why can’t cold working be used for strengthening in case of plastic deformation? |
| A. | Recrystallization |
| B. | Thermal instability |
| C. | Lowers tensile strength |
| D. | Introduces coarsening |
| Answer» B. Thermal instability | |
| 2. |
Strengthening of an iron base, nickel bade, and cobalt base alloys is done by __________ |
| A. | Precipitation hardening |
| B. | Grain boundary hardening |
| C. | Dispersion hardening |
| D. | Transformation hardening |
| Answer» D. Transformation hardening | |
| 3. |
Iron base alloys have melting point around __________ |
| A. | 900oC |
| B. | 1500oC |
| C. | 1900oC |
| D. | 2400oC |
| Answer» C. 1900oC | |
| 4. |
MgO and Al2O3 can be used at high temperature creep resistance due to _________ |
| A. | High melting point |
| B. | High oxygen concentration |
| C. | Low density |
| D. | Chemical stability |
| Answer» B. High oxygen concentration | |
| 5. |
The time required for the occurrence of creep is known as _________ |
| A. | Creep resistance |
| B. | Creep life |
| C. | Creep limit |
| D. | Creep recurrence |
| Answer» C. Creep limit | |
| 6. |
WHY_CAN‚ÄÖ√Ñ√∂‚ÀÖ√Ë‚ÀÖ¬•T_COLD_WORKING_BE_USED_FOR_STRENGTHENING_IN_CASE_OF_PLASTIC_DEFORMATION??$# |
| A. | Recrystallization |
| B. | Thermal instability |
| C. | Lowers tensile strength |
| D. | Introduces coarsening |
| Answer» B. Thermal instability | |
| 7. |
STRENGTHENING_OF_IRON_BASE,_NICKEL_BADE,_AND_COBALT_BASE_ALLOYS_IS_DONE_BY___________?$ |
| A. | Precipitation hardening |
| B. | Grain boundary hardening |
| C. | Dispersion hardening |
| D. | Transformation hardening |
| Answer» D. Transformation hardening | |
| 8. |
Iron base alloys have melting point around _________? |
| A. | 900<sup>o</sup>C |
| B. | 1500<sup>o</sup>C |
| C. | 1900<sup>o</sup>C |
| D. | 2400<sup>o</sup>C |
| Answer» C. 1900<sup>o</sup>C | |
| 9. |
MgO and Al2O3 can be used at high temperature creep resistance due to _________ |
| A. | High melting point |
| B. | High oxygen concentration |
| C. | Low density |
| D. | Chemical stability |
| Answer» B. High oxygen concentration | |
| 10. |
Which of the following will be rendered useless for prevention of creep? |
| A. | Coarse-grained material |
| B. | Strain hardening |
| C. | Precipitation hardening |
| D. | Quenching |
| Answer» E. | |
| 11. |
The time required for occurrence of creep is known as _________ |
| A. | Creep resistance |
| B. | Creep life |
| C. | Creep limit |
| D. | Creep recurrence |
| Answer» C. Creep limit | |
| 12. |
Which of the following does not affect creep? |
| A. | Grain size |
| B. | Thermal stability |
| C. | Chemical reactions |
| D. | Crystal structure |
| Answer» E. | |
| 13. |
_______ is known as steady-state creep. |
| A. | Primary creep |
| B. | Secondary creep |
| C. | Tertiary creep |
| D. | Quaternary creep |
| Answer» C. Tertiary creep | |
| 14. |
__________ experiences creep at room temperature. |
| A. | Iron |
| B. | Copper |
| C. | Nickel |
| D. | Lead |
| Answer» E. | |
| 15. |
Creep occurs at a temperature above ________ |
| A. | 0.16 T<sub>m</sub> |
| B. | 0.22 T<sub>m</sub> |
| C. | 0.4 T<sub>m</sub> |
| D. | 0.91 T<sub>m</sub> |
| Answer» D. 0.91 T<sub>m</sub> | |