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 corrosion test is most reliable to know the extent of pitting corrosion? |
| A. | To measure the average depth of pits |
| B. | To measure the maximum depth of a pit |
| C. | Weight loss method |
| D. | Weight gain method |
| Answer» C. Weight loss method | |
| 2. |
Which of the following ions, that can reduce pitting corrosion? |
| A. | Hydroxide salts |
| B. | Chromate salts |
| C. | Silicate salts |
| D. | Hydroxide, chromate and silicate salts |
| Answer» E. | |
| 3. |
Which of the following ions have a high tendency to pitting corrosion? |
| A. | Chlorides |
| B. | Bromides |
| C. | Hypo chlorites |
| D. | Chlorides, bromides, and hypochlorites |
| Answer» E. | |
| 4. |
Which of the following is/are the difference between the crevice and pitting corrosion? |
| A. | Autocatalytic nature |
| B. | Corrosion mechanism |
| C. | Initiation method |
| D. | Both the corrosion mechanism and initiation method |
| Answer» D. Both the corrosion mechanism and initiation method | |
| 5. |
Which of the following statement is correct regarding pitting corrosion? |
| A. | Adjacent surfaces cathodically protect pits |
| B. | Pits cathodically protect adjacent surfaces |
| C. | Neither pits nor adjacent surfaces protect each other |
| D. | Both pits and adjacent surfaces protect each other |
| Answer» C. Neither pits nor adjacent surfaces protect each other | |
| 6. |
Which of the following corrosion form is/are autocatalytic in nature? |
| A. | Pitting and crevice corrosion |
| B. | Crevice corrosion only |
| C. | Pitting corrosion only |
| D. | Pitting and intergranular corrosion |
| Answer» B. Crevice corrosion only | |
| 7. |
Which of the following corrosion form is considered as the intermediate stage between uniform corrosion and complete corrosion resistance? |
| A. | Galvanic corrosion |
| B. | Pitting corrosion |
| C. | Intergranular corrosion |
| D. | Erosion corrosion |
| Answer» C. Intergranular corrosion | |
| 8. |
Pitting usually requires an incubation period ranges from months to years. |
| A. | False |
| B. | True |
| Answer» C. | |
| 9. |
What is the usual direction for the growth of pits? |
| A. | Vertically downwards |
| B. | Vertically upwards |
| C. | Horizontally sideward |
| D. | Any primary direction |
| Answer» B. Vertically upwards | |
| 10. |
Which of the following metal is highly prone to pitting corrosion? |
| A. | 18-8 stainless steel by sulfuric acid with FeCl<sub>3</sub> |
| B. | Titanium by sulfuric acid with FeCl<sub>3</sub> |
| C. | Nickel by sulfuric acid with FeCl<sub>3</sub> |
| D. | Copper by sulfuric acid with FeCl<sub>3</sub> |
| Answer» B. Titanium by sulfuric acid with FeCl<sub>3</sub> | |
| 11. |
Which of the following are the reasons that make it difficult to detect pits? |
| A. | Small size |
| B. | Varying depths |
| C. | Pits covered with corrosion products |
| D. | Small size, varying depths and covered with corrosion products |
| Answer» E. | |
| 12. |
Which of the following form of corrosion is more destructive and insidious in nature? |
| A. | Uniform corrosion |
| B. | Intergranular corrosion |
| C. | Pitting corrosion |
| D. | Galvanic corrosion |
| Answer» D. Galvanic corrosion | |
| 13. |
Which of the following is the characteristic of a pit? |
| A. | Cavity with the surface diameter about the less than the depth |
| B. | Cavity with the surface diameter about the same as or less than the depth |
| C. | Cavity with the surface diameter about the same as or high than the depth |
| D. | Cavity with the surface diameter about the high than the depth |
| Answer» C. Cavity with the surface diameter about the same as or high than the depth | |
| 14. |
Pitting is a form of extremely localized attack that results in holes in the metal. |
| A. | True |
| B. | False |
| Answer» B. False | |