MCQOPTIONS
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MCQOPTIONS
This section includes 17 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Metallurgy knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
If the Larsen-Miller parameter is 50*103 at the temperature of 600 degrees. The C1 is equal to 50. Find the fatigue life of the component in hr? |
| A. | 1400 hr |
| B. | 500 hr |
| C. | 1442 hr |
| D. | 54841 hr |
| Answer» D. 54841 hr | |
| 2. |
The Laser miller parameter is defined as ____________ |
| A. | T(ln t+C<sub>1</sub>) = P<sub>1</sub> |
| B. | ln T(ln t+C<sub>1</sub>) = P<sub>1</sub> |
| C. | T(t+C<sub>1</sub>) = P<sub>1</sub> |
| D. | T/t+C<sub>1</sub> = P<sub>1</sub> |
| Answer» B. ln T(ln t+C<sub>1</sub>) = P<sub>1</sub> | |
| 3. |
The Larser-Miller parameter is used to predict the creep strength and the life of the component in long time by comparing the results obtained at elevated temperature in shorter time. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 4. |
For a creep strain of 1% in 1000hr, determine the strain rate in sec-1 for the given material? |
| A. | 10<sup>-2</sup> s<sup>-1</sup> |
| B. | 10<sup>-5</sup> s<sup>-1</sup> |
| C. | 2.8*10<sup>-9</sup> s<sup>-1</sup> |
| D. | 10<sup>-9</sup> s<sup>-1</sup> |
| Answer» D. 10<sup>-9</sup> s<sup>-1</sup> | |
| 5. |
According to Monkman and Grant, the relationship between the minimum creep rate and the rupture time is given as ________ (where the C and K are constant, and the tr is time to rupture and minimum creep rate). |
| A. | t<sub>r</sub> + C = K |
| B. | t<sub>r</sub> + C log = K |
| C. | log t<sub>r</sub> + C log = K |
| D. | t<sub>r</sub> + C = log K |
| Answer» D. t<sub>r</sub> + C = log K | |
| 6. |
The high-temperature alloys are fabricated by which of the following method? |
| A. | Rolling |
| B. | Forging |
| C. | Precision casting |
| D. | Extrusion |
| Answer» D. Extrusion | |
| 7. |
Which of the following is not a nickel-based high-temperature application alloy? |
| A. | Astroloy |
| B. | Inconel |
| C. | Udimet |
| D. | Vitallium |
| Answer» E. | |
| 8. |
The Inconel is an alloy which consists of _____________ |
| A. | Cr, Co, Mo |
| B. | Cr, W, Ti |
| C. | Cr, Ni, Fe |
| D. | Ti, Al, Co |
| Answer» D. Ti, Al, Co | |
| 9. |
Which of the following is not a high-temperature application precipitate? |
| A. | VC |
| B. | TiC |
| C. | Cr<sub>23</sub>C<sub>6</sub> |
| D. | Cu<sub>3</sub>Al |
| Answer» E. | |
| 10. |
The Suzuki Interaction in the crystal lattice is defined as the interaction between _______ |
| A. | dislocations |
| B. | solute atom and dislocation |
| C. | stacking faults |
| D. | grain boundary and solute atom |
| Answer» D. grain boundary and solute atom | |
| 11. |
Which of the following is preferred as solute for high-temperature application for metals? |
| A. | Interstitial solute with low valance |
| B. | Interstitial solute with high valance |
| C. | Substitutional solute with high valance |
| D. | Substitutional solute with low valance |
| Answer» D. Substitutional solute with low valance | |
| 12. |
Which of the following strengthening mechanism is most effective in increasing the creep resistance of the material? |
| A. | Precipitation hardening |
| B. | Strain hardening |
| C. | Dispersion strengthening |
| D. | Solid solution strengthening |
| Answer» D. Solid solution strengthening | |
| 13. |
The metal with ________ stacking fault energy has higher creep resistance. |
| A. | low |
| B. | high |
| C. | average |
| D. | alternate |
| Answer» B. high | |
| 14. |
The larger grain material will have _________ equicohesive temperature(ECT), while the fine grain material will have ____________ ECT. |
| A. | lower, higher |
| B. | higher, lower |
| C. | lower, lower |
| D. | higher, higher |
| Answer» C. lower, lower | |
| 15. |
The equicohesive temperature is a material property and always fixed for a given material. |
| A. | True |
| B. | False |
| Answer» C. | |
| 16. |
The equicohesive temperature is defined as the temperature at which both the grain and grain boundary have the same strength. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 17. |
As the temperature increases in polycrystalline metal, the nature of fracture change from _____________ to __________ |
| A. | intergranular, transgranular |
| B. | transgranular, intergranular |
| C. | tuctile, brittle |
| D. | creep, fatigue |
| Answer» C. tuctile, brittle | |