MCQOPTIONS
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MCQOPTIONS
This section includes 14 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. |
Metals or alloys that depend on oxide films for corrosive resistance are highly susceptible to crevice corrosion. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
What is the incubation period associated with a crevice attack? |
| A. | 1 month 10 months |
| B. | 1 hour 10 hours |
| C. | 1 day 10 days |
| D. | 6 months 1 year |
| Answer» E. | |
| 3. |
As the metal dissolution within the crevice increases, the rate of oxygen reduction on adjacent surfaces increases. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 4. |
Which of the following metal is highly resistant to crevice corrosion? |
| A. | Stainless steel |
| B. | Copper |
| C. | Aluminum |
| D. | Hastelloy C-276 |
| Answer» E. | |
| 5. |
Which of the following ions that accelerate the dissolution rate of metals or alloys in a crevice? |
| A. | H<sup>+</sup>, OH<sup> </sup> |
| B. | H<sup>+</sup>, Cl<sup> </sup> |
| C. | OH<sup> </sup>, Cl<sup> </sup> |
| D. | OH<sup> </sup>, Cl<sup> </sup> and H<sup> </sup> |
| Answer» C. OH<sup> </sup>, Cl<sup> </sup> | |
| 6. |
Which of the following chemical reaction that usually occurs in the crevice? |
| A. | M<sup>+</sup>+H<sub>2</sub>O=MOH |
| B. | M<sup>+</sup>+Cl<sup> </sup>=MCl<sub>(s)</sub> |
| C. | M<sup>+</sup>Cl<sup> </sup>+H<sub>2</sub>O=MOH<sub>(aq)</sub>+H<sup>+</sup>Cl<sup> </sup> |
| D. | 4OH<sup> </sup>=O<sub>2</sub>+2H<sub>2</sub>O+4e<sup> </sup> |
| Answer» D. 4OH<sup> </sup>=O<sub>2</sub>+2H<sub>2</sub>O+4e<sup> </sup> | |
| 7. |
The difference in metal ion or oxygen concentration between the crevice and its surroundings is the main reason for crevice corrosion. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
What is the primary condition regarding the velocity of an electrolyte to form crevice corrosion? |
| A. | The velocity of the electrolyte should be greater than 10cm/s |
| B. | The velocity of the electrolyte should be less than 10cm/s |
| C. | The velocity of the electrolyte should be equal to 10cm/s |
| D. | The stagnant electrolytic solution should be present |
| Answer» E. | |
| 9. |
Which of the following characteristics of the crevice is a must to act as a corrosion site? |
| A. | It should be wide enough to permit liquid entry |
| B. | It should be narrow enough to maintain a stagnant zone |
| C. | It should be wide enough to avoid a stagnant zone |
| D. | It should be wide enough to permit liquid entry and narrow enough to maintain a stagnant zone |
| Answer» E. | |
| 10. |
Which of the following combination results in crevice corrosion? |
| A. | Metal and absorbent gaskets |
| B. | Continuous weld metals |
| C. | Metal and non-absorbent gaskets |
| D. | Single metal piece |
| Answer» B. Continuous weld metals | |
| 11. |
Which of the following metal is more susceptible to crevice corrosion? |
| A. | Titanium |
| B. | Hastelloy C |
| C. | Stainless steel-430 |
| D. | Titanium and stainless steel |
| Answer» D. Titanium and stainless steel | |
| 12. |
Which of the following is the other name of crevice corrosion? |
| A. | Filiform corrosion |
| B. | Deposit or gasket corrosion |
| C. | Two-metal corrosion |
| D. | Surface corrosion |
| Answer» C. Two-metal corrosion | |
| 13. |
Which of the following type of corrosion is localized in nature? |
| A. | Crevice corrosion |
| B. | Galvanic corrosion |
| C. | Uniform corrosion |
| D. | Inter-granular corrosion |
| Answer» B. Galvanic corrosion | |
| 14. |
Which of the following is/are the reasons for the cause of crevice corrosion? |
| A. | The stagnant solution in the holes and gasket surfaces |
| B. | The stagnant solution in the lap joints and surface deposits |
| C. | Dissimilar metal contact |
| D. | The stagnant solution in the holes, gasket surfaces, lap joints, and surface deposits |
| Answer» E. | |