MCQOPTIONS
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MCQOPTIONS
This section includes 6 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Metallurgy Questions and Answers 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. |
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 | |
| 5. |
The Li model to predict the yield strength is based on dislocation density, which states that: |
| A. | -> σo=σi+αGρ-1/2 |
| B. | Where α is constant, and ρ is dislocation density. |
| C. | True |
| D. | False |
| Answer» B. Where α is constant, and ρ is dislocation density. | |
| 6. |
Considering Hall-Patch relationship, the Red-colored marked region is called __________ |
| A. | yield strength |
| B. | critical diameter |
| C. | friction stress |
| D. | hall-patch constant |
| Answer» D. hall-patch constant | |