MCQOPTIONS
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MCQOPTIONS
This section includes 18 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. |
___________ is a eutectic mixture of α iron and Fe3C. |
| A. | Pearlite |
| B. | Martensite |
| C. | Ledeburite |
| D. | Sorbite |
| Answer» D. Sorbite | |
| 2. |
Which microconstituent of iron-carbon alloys does this figure demonstrate? |
| A. | Pearlite |
| B. | Bainite |
| C. | Ledeburite |
| D. | Martensite |
| Answer» B. Bainite | |
| 3. |
___________ is a mixture of radial lamellae of ferrite and cementite. |
| A. | Troostite |
| B. | Ferrite |
| C. | Martensite |
| D. | Sorbite |
| Answer» B. Ferrite | |
| 4. |
What microconstituent of iron-carbon alloys does this diagram illustrate? |
| A. | Pearlite |
| B. | Austenite |
| C. | Cementite |
| D. | Sorbite |
| Answer» E. | |
| 5. |
Cementite is magnetic up to ________ |
| A. | 100oC |
| B. | 250oC |
| C. | 600oC |
| D. | 850oC |
| Answer» C. 600oC | |
| 6. |
Which of the following is applicable to α iron? |
| A. | Soft |
| B. | Ductile |
| C. | Magnetic |
| D. | Can be hot worked |
| Answer» E. | |
| 7. |
At what temperature range is δ iron stable? |
| A. | Up to 908oC |
| B. | 908-1388oC |
| C. | 1388-1535oC |
| D. | 1535-1800oC |
| Answer» D. 1535-1800oC | |
| 8. |
What is the crystal structure of ϒ iron? |
| A. | Body-centered cubic |
| B. | Face-centered cubic |
| C. | Hexagonal closely packed |
| D. | Body-centered tetrahedral |
| Answer» C. Hexagonal closely packed | |
| 9. |
____________IS_A_MIXTURE_OF_RADIAL_LAMELLAE_OF_FERRITE_AND_CEMENTITE.?$ |
| A. | Troostite |
| B. | Ferrite |
| C. | Martensite |
| D. | Sorbite |
| Answer» B. Ferrite | |
| 10. |
___________ is a eutectic mixture of α iron and Fe3C.$# |
| A. | Pearlite |
| B. | Martensite |
| C. | Ledeburite |
| D. | Sorbite |
| Answer» D. Sorbite | |
| 11. |
Cementite is magnetic up to _______? |
| A. | 100<sup>o</sup>C |
| B. | 250<sup>o</sup>C |
| C. | 600<sup>o</sup>C |
| D. | 850<sup>o</sup>C |
| Answer» C. 600<sup>o</sup>C | |
| 12. |
Which of the following is a nonmagnetic iron? |
| A. | Ferrite |
| B. | Austenite |
| C. | Cementite |
| D. | Alnico |
| Answer» C. Cementite | |
| 13. |
Which of the following is applicable to α iron?$ |
| A. | Soft |
| B. | Ductile |
| C. | Magnetic |
| D. | Can be hot worked |
| Answer» E. | |
| 14. |
At what temperature range is δ iron stable?$ |
| A. | Up to 908<sup>o</sup>C |
| B. | 908-1388<sup>o</sup>C |
| C. | 1388-1535<sup>o</sup>C |
| D. | 1535-1800<sup>o</sup>C |
| Answer» D. 1535-1800<sup>o</sup>C | |
| 15. |
What is the crystal structure of ϒ iron?$ |
| A. | Body-centered cubic |
| B. | Face-centered cubic |
| C. | Hexagonal closely packed |
| D. | Body-centered tetrahedral |
| Answer» C. Hexagonal closely packed | |
| 16. |
Pure iron exists in ________ allotropic forms. |
| A. | One |
| B. | Two |
| C. | Three |
| D. | Four |
| Answer» D. Four | |
| 17. |
The existence of two or more crystal structures for any substance, depending on temperature, is known as _________ |
| A. | Allotropy |
| B. | Solidification |
| C. | Solubility |
| D. | Interstices |
| Answer» B. Solidification | |
| 18. |
Alloys containing 2.0-6.7% carbon are considered as __________ |
| A. | Steel |
| B. | Cast-iron |
| C. | Aluminum |
| D. | Brass |
| Answer» C. Aluminum | |