MCQOPTIONS
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MCQOPTIONS
This section includes 13 Mcqs, each offering curated multiple-choice questions to sharpen your Corrosion Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following is/are the benefits of selective leaching? |
| A. | Enrichment of silicon on stainless steel for better passivity |
| B. | Preparation of Raney nickel catalyst |
| C. | Extraction of metals using hydrometallurgy |
| D. | Enrichment of silicon on stainless steel for better passivity, preparation of Raney nickel catalyst and extraction of metals using hydrometallurgy |
| Answer» E. | |
| 2. |
Which of the following is/are the other names of selective leaching? |
| A. | Dealloying |
| B. | Parting |
| C. | Dealloying and parting |
| D. | Neither dealloying nor parting |
| Answer» D. Neither dealloying nor parting | |
| 3. |
Which of the following acid that results in selective removal of aluminum in aluminum bronzes? |
| A. | Hydrochloric acid (HCl) |
| B. | Hydrofluoric acid (HF) |
| C. | Nitric acid (HNO<sub>3</sub>) |
| D. | Hydrochloric, hydrofluoric and nitric acid |
| Answer» C. Nitric acid (HNO<sub>3</sub>) | |
| 4. |
Which of the following type of cast irons that exhibits graphitization? |
| A. | Grey cast iron |
| B. | Nodular cast iron |
| C. | Malleable cast iron |
| D. | Grey cast iron, nodular cast iron, and malleable cast iron |
| Answer» B. Nodular cast iron | |
| 5. |
Which of the following phenomenon that results in the dissolution of iron by leaving porous graphite on the surface of grey cast iron? |
| A. | Dezincification |
| B. | Decalcification |
| C. | Graphitization |
| D. | Dezincification and graphitization |
| Answer» D. Dezincification and graphitization | |
| 6. |
Which of the following is/are the preventions of dezincification? |
| A. | Minimizing oxygen concentration |
| B. | Use of less susceptible alloy |
| C. | Adding a small amount of arsenic, antimony |
| D. | Removal of oxygen concentration, use of less susceptible alloy and adding a small amount of arsenic, antimony |
| Answer» E. | |
| 7. |
Which of the following type of brasses is/are highly prone to localize or plug-type dezincification? |
| A. | Low brasses |
| B. | High brasses |
| C. | Low and high brasses |
| D. | Neither low nor high brasses |
| Answer» B. High brasses | |
| 8. |
Which of the following type of brasses is/are highly prone to the uniform or layer-type dezincification? |
| A. | Low brasses |
| B. | High brasses |
| C. | Low and high brasses |
| D. | Neither high nor low brasses |
| Answer» C. Low and high brasses | |
| 9. |
Which of the following is/are the characteristics of dezincified brass alloy? |
| A. | Weak |
| B. | Permeable |
| C. | Porous |
| D. | Weak, permeable and porous |
| Answer» E. | |
| 10. |
The Alloying of zinc to copper lowers the corrosion resistance of the copper. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 11. |
Which of the following is/are the types of dezincification? |
| A. | Layer-type |
| B. | Plug-type |
| C. | Layer-type and Plug-type |
| D. | Neither Layer-type nor Plug-type |
| Answer» D. Neither Layer-type nor Plug-type | |
| 12. |
What is the percent of zinc that consists of common yellow brass? |
| A. | 70% |
| B. | 30% |
| C. | 40% |
| D. | 60% |
| Answer» C. 40% | |
| 13. |
Selective Leaching is the removal of one element from a solid alloy by the corrosion process. |
| A. | True |
| B. | False |
| Answer» B. False | |