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 corrosives that induce intergranular corrosion in austenitic stainless steel? |
| A. | Acetic acid |
| B. | Acetic acid+salicylic acid |
| C. | Ammonium nitrate |
| D. | Acetic acid, acetic acid+salicylic acid, ammonium nitrate |
| Answer» E. | |
| 2. |
Electric arc welding is used more than the gas welding for stainless steel to reduces the chances of weld decay. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3. |
Which of the following is used to visualize the heat flow and temperatures during welding? |
| A. | Weld decay |
| B. | Intergranular corrosion |
| C. | Tablecloth analogy |
| D. | Weld decay and intergranular corrosion |
| Answer» D. Weld decay and intergranular corrosion | |
| 4. |
Which of the following term is associated with intergranular corrosion in welded structures? |
| A. | Intergranular weld |
| B. | Weld failure |
| C. | Weld decay |
| D. | Weld corrosion |
| Answer» D. Weld corrosion | |
| 5. |
What is the structure of chromium carbide that precipitates at the grain boundaries? |
| A. | Acicular structure |
| B. | Leaflike structure |
| C. | Lamellar structure |
| D. | No specific structure |
| Answer» C. Lamellar structure | |
| 6. |
Which of the following characteristics of the impoverished area, results in a rapid corrosion attack? |
| A. | Less corrosion resistance |
| B. | The high content of chromium |
| C. | The large unfavorable area ratio |
| D. | Less corrosion resistance and large unfavorable area ratio |
| Answer» E. | |
| 7. |
What is the minimum percent of chromium is needed to make stainless steel? |
| A. | 2% |
| B. | 20% |
| C. | 1% |
| D. | 11% |
| Answer» E. | |
| 8. |
Which of the following areas is/are corroded in the intergranular corrosion of stainless steel? |
| A. | Grain only |
| B. | Grain boundary only |
| C. | Chromium depleted zone near the grain boundary |
| D. | Both grain and grain boundary |
| Answer» D. Both grain and grain boundary | |
| 9. |
What is the molecular formula of chromium carbide formed due to the depletion of chromium in 18-8 stainless steel? |
| A. | Cr<sub>3</sub>C |
| B. | Cr<sub>5</sub>C<sub>3</sub> |
| C. | CrC |
| D. | Cr<sub>23</sub>C<sub>6</sub> |
| Answer» E. | |
| 10. |
Numerous failures of 18-8 Stainless steel have occurred in the temperature range of 950 to 1450 F |
| A. | True |
| B. | False |
| Answer» B. False | |
| 11. |
Which of the following alloys is/are prone to intergranular corrosion? |
| A. | Iron in aluminum |
| B. | Zinc in brass |
| C. | 18-8 Stainless steel |
| D. | Iron in aluminum, zinc in brass and 18-8 stainless steel |
| Answer» E. | |
| 12. |
Which of the following is/are the causes of intergranular corrosion? |
| A. | Impurities at the grain boundaries |
| B. | Enrichment of one of the alloying elements at the grain boundary |
| C. | Depletion of one of the alloying elements at the grain boundary |
| D. | Impurities at the grain boundaries, enrichment, and depletion of one of the alloying elements at the grain boundary |
| Answer» E. | |
| 13. |
What is Intergranular corrosion? |
| A. | Localized attack at the grain boundaries |
| B. | Localized attack at the grain faces |
| C. | Uniform attack on grains |
| D. | Localized attack at and adjacent to the grain boundaries |
| Answer» E. | |
| 14. |
Which of the following is/are more reactive in intergranular corrosion? |
| A. | Grain |
| B. | Grain boundary |
| C. | Both grain and grain boundary |
| D. | Neither grain nor grain boundary |
| Answer» C. Both grain and grain boundary | |