MCQOPTIONS
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MCQOPTIONS
This section includes 11 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. |
The dynamic strain aging is not associated with _______ |
| A. | Diffusion of carbon |
| B. | Serration in the stress-strain curve |
| C. | Portevin-LeChatelier effect |
| D. | Dislocation multiplication |
| Answer» E. | |
| 2. |
Which of the following method helps in avoiding stretcher strain marks in deep drawing? |
| A. | Shot Peening |
| B. | Coating |
| C. | Skin pass rolling |
| D. | Carburation |
| Answer» D. Carburation | |
| 3. |
Aluminum, vanadium, titanium are generally added in steel to eliminate the yield point because they ___________ |
| A. | occupy the place of carbon in lattice |
| B. | increase the required value of stress to cause yield point |
| C. | they are strong carbide former to catch the carbon |
| D. | they act as a deoxidant |
| Answer» D. they act as a deoxidant | |
| 4. |
The stretcher strain marks are generally observed in which of the following metal working process? |
| A. | Forging |
| B. | Casting |
| C. | Deep drawing |
| D. | Rolling |
| Answer» D. Rolling | |
| 5. |
The nitrogen plays a higher role in strain aging than carbon in case of iron. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6. |
The reappearance of yield point in strain aging is due to the diffusion of carbon and nitrogen to the dislocation atmosphere. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7. |
After the strain ageing of the material, the _________ |
| A. | strength increases and ductility decreases |
| B. | strength decreases and ductility increases |
| C. | strength and ductility both increases |
| D. | strength and ductility both decreases |
| Answer» B. strength decreases and ductility increases | |
| 8. |
Find the strain rate (in /sec) of testing of metal with dislocation density 109 m-2 with burger s vector equal to 5 Ao? velocity of dislocation is 1 micron/sec. |
| A. | 5 |
| B. | 10<sup>-5</sup> |
| C. | 5*10<sup>-7</sup> |
| D. | 10<sup>-8</sup> |
| Answer» D. 10<sup>-8</sup> | |
| 9. |
In steel, the responsible alloying element to cause yield point phenomena? |
| A. | Carbon |
| B. | Molybdenum |
| C. | Sulfur |
| D. | Nickel |
| Answer» B. Molybdenum | |
| 10. |
The yield point phenomena are observed in which part of the stress-strain curve?Note: Yield point phenomena is not shown in the image. |
| A. | n<a href="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-strengthening-mechanisms-yield-point-phenomena-q2.png"><img alt="Yield point phenomena after proportional limit is crossed & material is plastic region" class="alignnone size-full wp-image-265696" height="241" sizes="(max-width: 405px) 100vw, 405px" src="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-strengthening-mechanisms-yield-point-phenomena-q2.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-strengthening-mechanisms-yield-point-phenomena-q2.png 405w, https://www.sanfoundry.com/wp-content/uploads/2020/01/mechanical-metallurgy-questions-answers-strengthening-mechanisms-yield-point-phenomena-q2-300x179.png 300w" width="405"/></a> |
| B. | A |
| C. | B |
| D. | C |
| E. | D |
| Answer» C. B | |
| 11. |
Yield point phenomena is observed in ____________ |
| A. | pure metal |
| B. | low carbon steel |
| C. | high carbon steel |
| D. | polymers |
| Answer» C. high carbon steel | |