MCQOPTIONS
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MCQOPTIONS
This section includes 13 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 is/are the preventions of stray current effect in an underground channel? |
| A. | Use of bus conductor |
| B. | Rearrangement of anodes |
| C. | Use of bus conductor and rearrangement of anodes |
| D. | Neither use of bus conductor nor rearrangements of anodes |
| Answer» D. Neither use of bus conductor nor rearrangements of anodes | |
| 2. |
Which of the following statements is/are correct about stray current? |
| A. | It usually encountered in cathodic-protection systems |
| B. | It refers to extraneous direct current in the earth |
| C. | Acceleration corrosion will occur at the point where the current enters the soil |
| D. | Stray current refers to extraneous direct current in the earth that usually encountered in cathodic protection systems and accelerated corrosion will occur at the point where current enters the soil |
| Answer» E. | |
| 3. |
Which of the following is an impressed current anode that is efficient in a marine environment? |
| A. | Platinized titanium |
| B. | Silicon-iron |
| C. | Scrap steel |
| D. | Graphite |
| Answer» B. Silicon-iron | |
| 4. |
Which of the following is/are the typical sacrificial anodes? |
| A. | Magnesium only |
| B. | Zinc and magnesium |
| C. | Aluminum-tin only |
| D. | Magnesium, Zinc, and aluminum-tin |
| Answer» E. | |
| 5. |
Which of the following reference electrode is used for cathodic-protection surveys? |
| A. | Standard hydrogen electrode |
| B. | Copper/copper sulfate reference electrode |
| C. | Calomel electrode |
| D. | Either calomel or standard hydrogen electrode |
| Answer» C. Calomel electrode | |
| 6. |
Which of the metallic structure will require more impressed current density for cathodic protection? |
| A. | Water heaters in hot freshwater |
| B. | Underground pipelines |
| C. | The storage tank of H<sub>2</sub>SO<sub>4</sub> |
| D. | Reinforcement rods |
| Answer» D. Reinforcement rods | |
| 7. |
Which of the following materials is/are used as backfill around the anode in impressed currents? |
| A. | Coke breeze |
| B. | Gypsum |
| C. | Bentonite |
| D. | Coke breeze, gypsum, and bentonite |
| Answer» E. | |
| 8. |
Which of the following material is/are used as an impressed-currents anode? |
| A. | Graphite |
| B. | Platinized titanium |
| C. | Silicon-iron |
| D. | Graphite, platinized titanium, and silicon-iron |
| Answer» E. | |
| 9. |
Which of the following terminal of the power supply should be connected to the metal to be protected? |
| A. | Negative terminal |
| B. | Positive terminal |
| C. | Both positive and negative terminals |
| D. | Either positive or negative terminal |
| Answer» B. Positive terminal | |
| 10. |
Which of the following is/are the types of cathodic protection? |
| A. | External impressed current supply |
| B. | Sacrificial anode |
| C. | External impressed current supply and sacrificial anode |
| D. | Neither external impressed current supply nor sacrificial anode |
| Answer» D. Neither external impressed current supply nor sacrificial anode | |
| 11. |
Which of the following cases in which the metal structure is protected? |
| A. | Current passes from metal to electrolyte |
| B. | Current enters it from the electrolyte |
| C. | Electrical contact with dissimilar metals |
| D. | Connecting the positive terminal of the power supply |
| Answer» C. Electrical contact with dissimilar metals | |
| 12. |
Cathodic protection is achieved by supplying electrons to the metal structure to be protected. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 13. |
Which of the following is/are the common electrochemical reactions that occur during corrosion? |
| A. | M==>M<sup>+</sup>+ne |
| B. | 2H<sup>+</sup>+2e=>H<sub>2</sub> |
| C. | O<sub>2</sub>+4H<sup>+</sup>+4e==>H<sub>2</sub>O |
| D. | M==>M<sup>+</sup>+ne, 2H<sup>+</sup>+2e=>H<sub>2</sub> and O<sub>2</sub>+4H<sup>+</sup>+4e==>H<sub>2</sub>O |
| Answer» E. | |