MCQOPTIONS
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MCQOPTIONS
This section includes 21 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Materials Metallurgy knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The thermal coating ‘thermally grown oxide’ is formed by the oxidation of _______ |
| A. | Silicon |
| B. | Magnesium |
| C. | Molybdenum |
| D. | Aluminum |
| Answer» E. | |
| 2. |
Which crystal structure is the Gamma Double Prime phase of nickel-based superalloy composed of? |
| A. | FCC |
| B. | BCC |
| C. | BCT |
| D. | HCP |
| Answer» D. HCP | |
| 3. |
Which phase represents the matrix of the alloy? |
| A. | Gamma |
| B. | Gamma Prime |
| C. | Gamma Double Prime |
| D. | Carbide |
| Answer» B. Gamma Prime | |
| 4. |
What is the oxidizing temperature of niobium? |
| A. | 100oC |
| B. | 200oC |
| C. | 400oC |
| D. | 600oC |
| Answer» D. 600oC | |
| 5. |
How can the ductility of tungsten be improved? |
| A. | Cold working |
| B. | Condensation |
| C. | Hot working |
| D. | Forming |
| Answer» B. Condensation | |
| 6. |
Which type of refractory brick does the following illustration represent? |
| A. | Wedge |
| B. | End Skew |
| C. | Jamb |
| D. | Soap |
| Answer» D. Soap | |
| 7. |
WHAT_IS_THE_OXIDIZING_TEMPERATURE_OF_NIOBIUM??$ |
| A. | 100<sup>o</sup>C |
| B. | 200<sup>o</sup>C |
| C. | 400<sup>o</sup>C |
| D. | 600<sup>o</sup>C |
| Answer» D. 600<sup>o</sup>C | |
| 8. |
Which crystal structure is the Gamma Double Prime phase of nickel-based superalloy composed of?$ |
| A. | FCC |
| B. | BCC |
| C. | BCT |
| D. | HCP |
| Answer» D. HCP | |
| 9. |
Which phase represents the matrix of the alloy?$ |
| A. | Gamma |
| B. | Gamma Prime |
| C. | Gamma Double Prime |
| D. | Carbide |
| Answer» B. Gamma Prime | |
| 10. |
Which of the following applications does a tungsten-carbide coating provide? |
| A. | Abrasion resistance |
| B. | Corrosion resistance |
| C. | Loss of coating mass |
| D. | Heat resistance |
| Answer» D. Heat resistance | |
| 11. |
The thermal coating ‘thermally grown oxide’ is formed by the oxidation of _______$ |
| A. | Silicon |
| B. | Magnesium |
| C. | Molybdenum |
| D. | Aluminum |
| Answer» E. | |
| 12. |
Which of the following is not an effect of adding boron and silicon to superalloys? |
| A. | Improves adhesion |
| B. | Maintains oxide layer |
| C. | Increases spalling |
| D. | Reduces spalling |
| Answer» D. Reduces spalling | |
| 13. |
TCP phase of nickel-based superalloys are formed at a temperature of _______ |
| A. | 200<sup>o</sup>C |
| B. | 400<sup>o</sup>C |
| C. | 600<sup>o</sup>C |
| D. | > 750<sup>o</sup>C |
| Answer» E. | |
| 14. |
In which temperature range is Gamma Prime phase of nickel-based superalloys unstable? |
| A. | 100-200<sup>o</sup>C |
| B. | 200-400<sup>o</sup>C |
| C. | 600-850<sup>o</sup>C |
| D. | 850-1000<sup>o</sup>C |
| Answer» D. 850-1000<sup>o</sup>C | |
| 15. |
How can ductility of tungsten be improved? |
| A. | Cold working |
| B. | Condensation |
| C. | Hot working |
| D. | Forming |
| Answer» B. Condensation | |
| 16. |
Which of the following is not a characteristic of tungsten? |
| A. | Good strength |
| B. | Good electrical conductivity |
| C. | Heavy |
| D. | Good insulation |
| Answer» E. | |
| 17. |
TMZ is an alloy of _______ |
| A. | Tungsten |
| B. | Magnesium |
| C. | Molybdenum |
| D. | Tin |
| Answer» D. Tin | |
| 18. |
What is the hardness of tungsten at room temperature? |
| A. | 250 VHN |
| B. | 480 VHN |
| C. | 155 VHN |
| D. | 60 VHN |
| Answer» C. 155 VHN | |
| 19. |
How is the corrosion resistance of high alumina when compared against fireclay? |
| A. | Higher |
| B. | Equal |
| C. | Lower |
| D. | No resistance |
| Answer» B. Equal | |
| 20. |
Which of the following is a property of fireclay? |
| A. | Rigid under load |
| B. | Poor resistance to spalling |
| C. | Instability in volume |
| D. | Poor resistance to attack by alkalies |
| Answer» B. Poor resistance to spalling | |
| 21. |
How much silica do silica refractories usually contain? |
| A. | 95 – 97% |
| B. | 0.2 – 1.0% |
| C. | 1.8 – 3.5% |
| D. | 0.3 – 0.9% |
| Answer» B. 0.2 ‚Äö√Ñ√∂‚àö√ë‚àö¬® 1.0% | |