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. |
Which of the following phenomenon that occurs on metal surface during inhibition? |
| A. | Adsorption only |
| B. | Adsorption and phase layers |
| C. | Phase layers only |
| D. | Neither adsorption nor phase layers |
| Answer» C. Phase layers only | |
| 2. |
Which of the following inhibitor is used for steel in the water? |
| A. | Sodium silicate |
| B. | Alkali metal nitrates |
| C. | Benzoic acid |
| D. | 2% boron trifluoride |
| Answer» D. 2% boron trifluoride | |
| 3. |
Which of the following inhibitor is used for steel in 80% pure sulfuric acid? |
| A. | 2% boron trifluoride |
| B. | Sodium silicate |
| C. | Alkali metal nitrates |
| D. | Benzoic acid |
| Answer» B. Sodium silicate | |
| 4. |
Which of the following inhibitor is used for aluminum in the hydrogen peroxide environment? |
| A. | 2% boron trifluoride |
| B. | Alkali metal nitrates |
| C. | Sodium silicate |
| D. | Benzoic acid |
| Answer» C. Sodium silicate | |
| 5. |
Which of the following is/are the limitations of inhibitors? |
| A. | It contaminates the environment |
| B. | Inhibitors are toxic |
| C. | Its efficiency decreases with time and temperature |
| D. | It contaminates the environment, toxic in nature, and its efficiency decreases with time and temperature. |
| Answer» E. | |
| 6. |
Which of the following phenomenon in which the inhibiting effect is sometimes greater than that would be achieved by either of the two or substances alone? |
| A. | Galvanic effect |
| B. | Cathodic protection |
| C. | Synergistic effect |
| D. | Inhibiting effect |
| Answer» D. Inhibiting effect | |
| 7. |
Which of the following is/are the characteristics of the vapor phase inhibitor? |
| A. | It has a very high vapor pressure |
| B. | Inhibit the atmospheric corrosion without being contact with the metal surface |
| C. | Effective in closed spaces |
| D. | It has very high vapor pressure, inhibit atmosphere corrosion without being contact with the metal surface and very effective in closed spaces |
| Answer» E. | |
| 8. |
Oxidizers such as chromates, nitrates, and ferric salts inhibit the corrosion of metal and alloys that demonstrate active-passive transition. |
| A. | False |
| B. | True |
| Answer» C. | |
| 9. |
Which of the following is/are the examples of scavengers? |
| A. | Arsenic and Antimony |
| B. | Chromates and ferric salts |
| C. | Sodium sulfite and hydrazine |
| D. | Organic amines |
| Answer» D. Organic amines | |
| 10. |
Which of the following is/are the examples of Hydrogen-evolution poisons? |
| A. | Arsenic and Antimony |
| B. | Sodium sulfite and hydrazine |
| C. | Chromates and ferric salts |
| D. | Organic amines |
| Answer» B. Sodium sulfite and hydrazine | |
| 11. |
Which of the following inhibitors are effective in acid solutions? |
| A. | Oxidizers |
| B. | Hydrogen-evolution poisons |
| C. | Vapor-phase inhibitors |
| D. | Oxidizers and hydrogen-evolution poisons |
| Answer» C. Vapor-phase inhibitors | |
| 12. |
Which of the following is an example of adsorption-type inhibitors? |
| A. | Arsenic |
| B. | Sodium sulfite |
| C. | Organic amines |
| D. | Chromates |
| Answer» D. Chromates | |
| 13. |
Which of the following is/are the types of inhibitors? |
| A. | Adsorption inhibitors |
| B. | Scavengers |
| C. | Vapor-phase inhibitors |
| D. | Adsorption inhibitors, scavengers, and vapor-phase inhibitors |
| Answer» E. | |
| 14. |
An inhibitor is a chemical substance that added in small concentrations to an environment, to decrease the corrosion rate. |
| A. | True |
| B. | False |
| Answer» B. False | |