MCQOPTIONS
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MCQOPTIONS
This section includes 10 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 non-metallic has the highest corrosive resistance to the phosphoric acid with temperature? |
| A. | Teflon |
| B. | Graphite |
| C. | Polyvinyl chloride |
| D. | Polyethylene |
| Answer» B. Graphite | |
| 2. |
Which of the following is/are the impurities that cause corrosion in commercial phosphoric acid? |
| A. | Fluorides |
| B. | Chlorides |
| C. | Sulfuric acids |
| D. | Fluorides, chlorides and sulfuric acid |
| Answer» E. | |
| 3. |
Which of the following materials exhibits poor corrosion resistance to phosphoric acid? |
| A. | Aluminum and brass |
| B. | Aluminum, brass, steel, cast iron, ferritic and martensitic stainless steels |
| C. | Steel and cast iron |
| D. | Ferritic and martensitic stainless steels |
| Answer» C. Steel and cast iron | |
| 4. |
Which of the following materials is/are widely used for phosphoric acid? |
| A. | 316 stainless steel |
| B. | Durimet 20 |
| C. | Neither 316 stainless steel nor Durimet 20 |
| D. | Both 316 stainless steel and Durimet 20 |
| Answer» E. | |
| 5. |
Why straight chromium stainless steels and austenitic stainless steels are not recommended for hydrofluoric acid applications? |
| A. | Due to susceptibility to crevice |
| B. | Due to limited corrosion resistance |
| C. | Due to susceptibility to pitting |
| D. | Sensitive to erosion-corrosion |
| Answer» D. Sensitive to erosion-corrosion | |
| 6. |
Which of the following metal is an outstanding material that resists all concentrations of hydrofluoric acid at all temperatures? |
| A. | Wrought Monel |
| B. | Steel |
| C. | Stainless steel |
| D. | Hastelloy C |
| Answer» B. Steel | |
| 7. |
Which of the following is/are the impurities in commercial hydrofluoric acid that decreases corrosion of steel? |
| A. | Sulfuric acid |
| B. | Fluosilicic acid |
| C. | Neither sulfuric acid nor fluosilicic acid |
| D. | Both sulfuric acid and fluosilicic acid |
| Answer» E. | |
| 8. |
Which of the following metal is suitable in handling high concentrations (>60%) of hydrofluoric acid? |
| A. | Stainless steel |
| B. | Brass |
| C. | Steel |
| D. | Titanium |
| Answer» D. Titanium | |
| 9. |
Hydrofluoric acid and fluorine are toxic and extreme care are mandatory in the handling of these materials. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 10. |
Which of the following material is/are primarily used for hydrofluoric acid? |
| A. | High-silicon cast iron |
| B. | Magnesium |
| C. | Aluminum |
| D. | Glass and stoneware |
| Answer» C. Aluminum | |