MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 11 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Materials and Metallurgy knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Bainite in iron-carbon alloys has a ___________ structure. |
| A. | Dendritic |
| B. | Non-lamellar |
| C. | Linear |
| D. | Hexahedral |
| Answer» C. Linear | |
| 2. |
Hot-quenching of eutectoid steels in austenitic condition results in formation of ___________ |
| A. | Pearlite |
| B. | Bainite |
| C. | Ferrite |
| D. | Cementite |
| Answer» C. Ferrite | |
| 3. |
Rapid quenching of eutectoid steel ___________ transforms the austenite into martensite. |
| A. | At room temperature |
| B. | Below 320<sup>o</sup>C |
| C. | At 550<sup>o</sup>C |
| D. | Above 723<sup>o</sup>C |
| Answer» E. | |
| 4. |
Isothermal transformations of eutectoid steel between 723oC and 550oC produces __________ microstructure. |
| A. | Pearlite |
| B. | Bainite |
| C. | Ferrite |
| D. | Cementite |
| Answer» B. Bainite | |
| 5. |
Examination of transformation time after quenching is done ___________ |
| A. | At room temperature |
| B. | Below melting point |
| C. | Above eutectoid temperature |
| D. | Above boiling temperature |
| Answer» B. Below melting point | |
| 6. |
Austenising of samples for TTT diagram is done __________ temperature. |
| A. | At room temperature |
| B. | Below melting point |
| C. | Above eutectoid temperature |
| D. | Above boiling temperature |
| Answer» D. Above boiling temperature | |
| 7. |
The first step in constructing a TTT diagram involves _________ the sample. |
| A. | Annealing |
| B. | Normalising |
| C. | Quenching |
| D. | Austenising |
| Answer» E. | |
| 8. |
Which of the following is not an alternative name for the TTT diagram? |
| A. | S curve |
| B. | C curve |
| C. | Adiabatic curve |
| D. | Bain s curve |
| Answer» D. Bain s curve | |
| 9. |
__________ is used to predict quenching reactions in steels. |
| A. | Isothermal transformation diagram |
| B. | Iron-iron carbide equilibrium diagram |
| C. | Continuous cooling transformation diagram |
| D. | Logarithm scale |
| Answer» B. Iron-iron carbide equilibrium diagram | |
| 10. |
What does CCT diagram stand for? |
| A. | Constant-critical-temperature |
| B. | Constant-cooling-temperature |
| C. | Continuous-cooling-transformation |
| D. | Continuous-creep-transformation |
| Answer» D. Continuous-creep-transformation | |
| 11. |
Non-equilibrium phases are shown for their time and transformation using _________ |
| A. | Fe-Fe3C diagram |
| B. | TTT diagram |
| C. | CCT diagram |
| D. | TTT and CCT diagram |
| Answer» E. | |