MCQOPTIONS
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MCQOPTIONS
This section includes 10 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. |
What is the equilibrium spacing between the edge dislocation along a low angle grain boundary of 1.5-degree misorientation? (Given that the burger s vector of dislocation is equal to 3 A ). |
| A. | 10 A |
| B. | 1550 A |
| C. | 30 A |
| D. | 115 A |
| Answer» E. | |
| 2. |
If there are 10000 grains in 1 mm2 at 50X, how many grains will be there in the same area at 100X? |
| A. | 20000 |
| B. | 5000 |
| C. | 2500 |
| D. | 100000 |
| Answer» D. 100000 | |
| 3. |
If there are 40 grains in 1 mm2 at 100X, how many grains were there in the actual grain of 1 mm2 of the surface? |
| A. | 200 |
| B. | 200000 |
| C. | 0.4 |
| D. | 400000 |
| Answer» E. | |
| 4. |
Determine the grain diameter if ASTM grain size number is 5? |
| A. | 9.32*10<sup>-5</sup> m |
| B. | 6.32*10<sup>-3</sup> m |
| C. | 44.7*10<sup>-6</sup> m |
| D. | 44.7*10<sup>-8</sup> m |
| Answer» C. 44.7*10<sup>-6</sup> m | |
| 5. |
As the ASTM grain size number increases, the number of grain per unit volume will ______________ |
| A. | increase |
| B. | decrease |
| C. | remain constant |
| D. | increase first, then decrease |
| Answer» B. decrease | |
| 6. |
As the ASTM grain size number increases, the grain diameter will ______________ |
| A. | increase |
| B. | decrease |
| C. | remain constant |
| D. | increase first, then decrease |
| Answer» C. remain constant | |
| 7. |
ASTM Grain size measurement method counts the __________________ |
| A. | number of grain in 1 mm<sup>2</sup> at magnification of 1X |
| B. | number of grain in 1 mm<sup>2</sup> at magnification of 100X |
| C. | number of grain in 100 mm<sup>2</sup> at magnification of 1X |
| D. | number of grain in 100 mm<sup>2</sup> at a magnification of 100X |
| Answer» B. number of grain in 1 mm<sup>2</sup> at magnification of 100X | |
| 8. |
The mean intercept method of grain size measurement ______________ |
| A. | overestimates the grain size |
| B. | underestimates the grain size |
| C. | predicts the accurate grain size |
| D. | no defined relation |
| Answer» C. predicts the accurate grain size | |
| 9. |
The yield strength of a material is 200MPa when the grain size is 80 micron. If the frictional stress is 80MPa, find the strength when the grain diameter is 160 micron? |
| A. | 100 MPa |
| B. | 150MPa |
| C. | 250MPa |
| D. | 180 MPa |
| Answer» E. | |
| 10. |
The Li model to predict the yield strength is based on dislocation density, which states that:-> o= i+ G -1/2 |
| A. | nWhere is constant, and is dislocation density. |
| B. | True |
| C. | False |
| Answer» B. True | |