MCQOPTIONS
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MCQOPTIONS
This section includes 21 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. |
Titanium alloys can be used up to 1000°C. |
| A. | True |
| B. | False |
| Answer» C. | |
| 2. |
Which material can’t be used above 1000°C? |
| A. | W |
| B. | Pb |
| C. | Mo |
| D. | Nb |
| Answer» C. Mo | |
| 3. |
In the alloy Incoloy 901, part of the iron is replaced by _________ to improve high temperature stability. |
| A. | Co |
| B. | Ni |
| C. | Mo |
| D. | Al |
| Answer» C. Mo | |
| 4. |
What is the largest use for superalloys? |
| A. | Refrigeration |
| B. | Bullets |
| C. | Transportation |
| D. | Gas turbines |
| Answer» E. | |
| 5. |
Protective action against corrosion is provided by _________ |
| A. | CO2 |
| B. | Cl2 |
| C. | Cr2O3 |
| D. | ZnO |
| Answer» D. ZnO | |
| 6. |
Which of the following is a superalloy category? |
| A. | Lead-base |
| B. | Tin-base |
| C. | Zinc-base |
| D. | Cobalt-base |
| Answer» E. | |
| 7. |
Ferritic steels are susceptible to 475°C embrittlement when chromium exceeds _________ |
| A. | 2% |
| B. | 5% |
| C. | 13% |
| D. | 15% |
| Answer» D. 15% | |
| 8. |
PROTECTIVE_ACTION_AGAINST_CORROSION_IS_PROVIDED_BY__________?$ |
| A. | CO<sub>2</sub> |
| B. | Cl<sub>2</sub> |
| C. | Cr<sub>2</sub>O<sub>3</sub> |
| D. | ZnO |
| Answer» D. ZnO | |
| 9. |
In the alloy Incoloy 901, part of the iron is replaced by _________ to improve high temperature stability.$ |
| A. | Co |
| B. | Ni |
| C. | Mo |
| D. | Al |
| Answer» C. Mo | |
| 10. |
What_is_the_largest_use_for_superalloys?$ |
| A. | Refrigeration |
| B. | Bullets |
| C. | Transportation |
| D. | Gas turbines |
| Answer» E. | |
| 11. |
Ni is used to stabilize FCC structure in iron-base superalloys. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 12. |
Titanium alloys can be used up to 1000°C.$ |
| A. | True |
| B. | False |
| Answer» C. | |
| 13. |
Which material can’t be used above 1000°C?$ |
| A. | W |
| B. | Pb |
| C. | Mo |
| D. | Nb |
| Answer» C. Mo | |
| 14. |
Nickel base superalloys have _________ solid solution matrix. |
| A. | BCC |
| B. | HCP |
| C. | FCC |
| D. | BCT |
| Answer» D. BCT | |
| 15. |
Which of the following is not a superalloy category? |
| A. | Iron-base |
| B. | Nickel-base |
| C. | Copper-base |
| D. | Cobalt-base |
| Answer» D. Cobalt-base | |
| 16. |
Ferritic steels are susceptible to 475°C embrittlement when chromium exceeds _________$ |
| A. | 2% |
| B. | 5% |
| C. | 13% |
| D. | 15% |
| Answer» D. 15% | |
| 17. |
What is the advantage of ferritic steels? |
| A. | Weldable |
| B. | Oxidation resistant |
| C. | Sub-zero temperature |
| D. | Ductility |
| Answer» C. Sub-zero temperature | |
| 18. |
_________ are difficult to weld. |
| A. | Austenitic steels |
| B. | Ferritic steels |
| C. | Aluminum |
| D. | Cast iron |
| Answer» C. Aluminum | |
| 19. |
What is the most important method of improving creep strength? |
| A. | Solid solution strengthening |
| B. | Precipitation hardening |
| C. | Dispersion hardening |
| D. | Quenching |
| Answer» D. Quenching | |
| 20. |
Which method improves creep resistance but not strength? |
| A. | Solution strengthening |
| B. | Alloying |
| C. | Grain coarsening |
| D. | Precipitation hardening |
| Answer» D. Precipitation hardening | |
| 21. |
In ferrite the self-diffusion coefficient _________ with increasing carbon content. |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | First increases, then decrease |
| Answer» B. Decreases | |