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 is/are the limitations of high-temperature non-metallic materials? |
| A. | Lack of ductility |
| B. | Less resistance to thermal shock |
| C. | Weldability, less resistance to thermal shock, lack of ductility and formability |
| D. | Weldability and formability |
| Answer» D. Weldability and formability | |
| 2. |
Which of the following is/are the high melting point metals? |
| A. | Molybdenum |
| B. | Tungsten |
| C. | Columbium |
| D. | Molybdenum, tungsten, columbium, and tantalum |
| Answer» E. | |
| 3. |
Which of the following nickel-based alloys is/are superalloys? |
| A. | Hastelloy C-276 |
| B. | Inconel 718 |
| C. | Hastelloy C-276, Inconel 718 and Hastelloy HX |
| D. | Hastelloy HX |
| Answer» D. Hastelloy HX | |
| 4. |
Which of the following metallurgical changes that affect the structural stability of metals at high temperatures? |
| A. | Grain growth, phase changes, precipitation dissolution and precipitation over aging |
| B. | Grain growth and phase changes |
| C. | Precipitation dissolution and precipitation over aging |
| D. | Phase changes, precipitation dissolution and precipitation over aging |
| Answer» B. Grain growth and phase changes | |
| 5. |
Which of the following strengthening mechanisms is/are used to attain high-temperature strength? |
| A. | Solid-solution strengthening |
| B. | Precipitation hardening |
| C. | Dispersion hardening |
| D. | Solid-solution strengthening, precipitation hardening or dispersion hardening |
| Answer» E. | |
| 6. |
Which of the following is/are the adequate high-temperature mechanical properties to avoid fracture? |
| A. | Low creep rate and high stress-rupture strength |
| B. | High stress-rupture strength, low creep rate, and high fracture toughness |
| C. | High stress-rupture strength and high fracture toughness |
| D. | Low creep rate and high fracture toughness |
| Answer» C. High stress-rupture strength and high fracture toughness | |
| 7. |
Which of the following is/are true regarding stress rupture? |
| A. | The stress required to cause a rupture in a predetermined time at a constant temperature |
| B. | It is important in short-term high-temperature applications |
| C. | Stress rupture is an important mechanical property for gas turbine or rocket engines |
| D. | The stress required to cause a rupture in short-term high-temperature applications at a predetermined time is known as stress rupture and it is an important mechanical property for gas turbines and rocket engines |
| Answer» E. | |
| 8. |
Which of the following is/are correct regarding creep? |
| A. | It is the continuous plastic elongation of metal under constant load |
| B. | It is the high-temperature mechanical effect of a metal |
| C. | It is the continuous plastic elongation of metal under constant load at high temperature and it can be minimized by the fraction of grain boundaries |
| D. | It can be minimized by reducing the fraction of grain boundaries |
| Answer» D. It can be minimized by reducing the fraction of grain boundaries | |
| 9. |
Which of the following mechanical properties is/are important in structural applications of metals? |
| A. | Tensile strength |
| B. | Yield strength |
| C. | Ductility and Elasticity |
| D. | Tensile strength, Yield strength, Ductility, and Fracture toughness |
| Answer» E. | |
| 10. |
Dilute alloying elements of base metals exhibiting a relatively high solubility and diffusivity for atomic oxygen are subject to internal corrosion. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 11. |
Which of the following is/are true regarding internal corrosion? |
| A. | Corrosion products precipitate in the metal matrix |
| B. | Corrosion products precipitate in the metal matrix and metals such as Fe, Ni, and Co are highly prone to internal corrosion |
| C. | Corrosion occurs on external surfaces of metals |
| D. | It is due to the stable corrosion products of base metals |
| Answer» C. Corrosion occurs on external surfaces of metals | |
| 12. |
Which of the following metals results in the formation of volatile oxides? |
| A. | Molybdenum |
| B. | Tungsten |
| C. | Osmium, tungsten, molybdenum, and Vanadium |
| D. | Vanadium |
| Answer» D. Vanadium | |
| 13. |
Which of the following metals results in the ignition in extreme cases? |
| A. | Sodium |
| B. | Magnesium |
| C. | Niobium |
| D. | Sodium, magnesium, and niobium |
| Answer» E. | |
| 14. |
Metals that follow linear oxidation kinetics at low temperatures tend to oxidize catastrophicallyat high temperatures. |
| A. | True |
| B. | False |
| Answer» B. False | |