MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 11 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 industries uses Tafel extrapolation or linear polarization to measure low corrosion rates? |
| A. | Nuclear industries |
| B. | Pharmaceutical industries |
| C. | Food processing industries |
| D. | Nuclear, pharmaceutical and food processing industries |
| Answer» E. | |
| 2. |
What is the formula to determine the slope of linear polarization curve? |
| A. | E/ i =[2.3*icorr*( a+ b)]/[ a* b] |
| B. | E/ i=[ a+ b]/[2.3*icorr*( a* b)] |
| C. | E/ i=[ a* b]/[2.3*icorr*( a+ b)] |
| D. | E/ i=[2.3*icorr*( a* b)]/[ a+ b] |
| Answer» D. E/ i=[2.3*icorr*( a* b)]/[ a+ b] | |
| 3. |
What is the range of current density around corrosion potential that will observe that the applied current density is a linear function of the electrode potential? |
| A. | 10 mV more noble or active around corrosion potential |
| B. | 5 mV more noble or active around corrosion potential |
| C. | 10 V more noble or active around corrosion potential |
| D. | 5 V more noble or active around corrosion potential |
| Answer» B. 5 mV more noble or active around corrosion potential | |
| 4. |
Which of the following is/are the limitations of Tafel extrapolation? |
| A. | For reasonable accuracy, the Tafel region must be extended |
| B. | It can be applied to systems containing one reduction process only |
| C. | Much interference from concentration polarization |
| D. | It can be applied to systems containing one reduction process, for reasonable accuracy the Tafel region must be extended and there will be much interference from concentration polarization |
| Answer» E. | |
| 5. |
Which of the following is/are the advantages of Tafel extrapolation? |
| A. | It can measure extremely low corrosion rates |
| B. | It can be used for continuously monitoring the corrosion rate of a system |
| C. | It can be used for continuously monitoring the corrosion rate of a system with high accuracy and measures extremely low corrosion rates |
| D. | It can be performed rapidly with high accuracy |
| Answer» D. It can be performed rapidly with high accuracy | |
| 6. |
The applied current cathodic polarization curve of a corroding metal is non-linear at low currents, but it becomes linear at higher currents on a semilogarithmic plot. |
| A. | False |
| B. | True |
| Answer» C. | |
| 7. |
Which of the following electrochemical methods is/are used to determine the corrosion rate? |
| A. | Tafel extrapolation |
| B. | Linear polarization |
| C. | Tafel extrapolation and linear polarization |
| D. | Neither Tafel extrapolation nor linear polarization |
| Answer» D. Neither Tafel extrapolation nor linear polarization | |
| 8. |
Stainless steels containing small quantities of platinum passivates more readily in the presence of oxygen, ferric salts, and other oxidizing agents. |
| A. | False |
| B. | True |
| Answer» C. | |
| 9. |
Which of the following noble metals will improve the corrosion resistance of titanium and chromium on galvanic coupling? |
| A. | Platinum |
| B. | Palladium |
| C. | Rhodium |
| D. | Platinum, palladium, and rhodium |
| Answer» E. | |
| 10. |
The optimum potential for anodic protection is in the mid of passive region since it permits slight variations. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 11. |
What is meant by anodic protection? |
| A. | Accompanying the sacrificial metal with metallic structure |
| B. | Prevention of corrosion by impressed cathodic current by supply electrons |
| C. | Prevention of corrosion by the impressed anodic current is used to transform from active to a passive state |
| D. | Additions of oxidizers and oxidizing agents for the formation of an oxide layer |
| Answer» D. Additions of oxidizers and oxidizing agents for the formation of an oxide layer | |