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. |
In the ductile material the necking begins, at the point where ________________ |
| A. | increased strain hardening cross the yield point |
| B. | increased strain hardening fails to compensate for the decrease in the cross-section area |
| C. | the decrease cross-sectional area reaches half the initial cross-sectional area |
| D. | the decrease cross-sectional area reaches one-fourth of the initial cross-sectional area |
| Answer» C. the decrease cross-sectional area reaches half the initial cross-sectional area | |
| 2. |
Rupture is a type of _________ |
| A. | ductile fracture |
| B. | brittle fracture |
| C. | fatigue fracture |
| D. | creep fracture |
| Answer» B. brittle fracture | |
| 3. |
The necking is phenomena observed in ___________ |
| A. | ductile fracture |
| B. | brittle fracture |
| C. | fatigue fracture |
| D. | creep fracture |
| Answer» B. brittle fracture | |
| 4. |
If the surface energy is high then _____________ is not likely to happen. |
| A. | brittle fracture |
| B. | ductile fracture |
| C. | fatigue fracture |
| D. | pure shear fracture |
| Answer» B. ductile fracture | |
| 5. |
As the grain size decreases, the ductile to brittle transition temperature _________ |
| A. | increases |
| B. | decreases |
| C. | remains the same |
| D. | no defined relationship between them |
| Answer» C. remains the same | |
| 6. |
The ductile to brittle transition does not depend on the metallurgical feature. It is material-specific property. |
| A. | True |
| B. | False |
| Answer» C. | |
| 7. |
Which of the following equation depicts the Cottrell formulation of ductile to brittle transition? |
| A. | ( <sub>i</sub>D<sup>1/2</sup>+k )k = G <sub>s</sub> |
| B. | ( <sub>i</sub>D<sup>1/2</sup>+k )k > G <sub>s</sub> |
| C. | ( <sub>i</sub>D<sup>1/2</sup>+k )k < G <sub>s</sub> |
| D. | ( <sub>i</sub>D<sup>1/2</sup>+k ) = G <sub>s</sub> |
| Answer» C. ( <sub>i</sub>D<sup>1/2</sup>+k )k < G <sub>s</sub> | |
| 8. |
The grain size has an effect on the ductile or brittle failure of material. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
Which of the following force is responsible for forcing dislocation together during cracking? |
| A. | Tensile force |
| B. | Shear force |
| C. | Bending force |
| D. | Torsional force |
| Answer» C. Bending force | |
| 10. |
The form of microcrack nucleation equation is_________ |
| A. | ( <sub>s</sub>- <sub>i</sub>)nb = 2 <sub>s</sub> |
| B. | ( <sub>s</sub>- <sub>i</sub>)nb = 3 <sub>s</sub> |
| C. | ( <sub>s</sub>- <sub>i</sub>)nb = 4 <sub>s</sub> |
| D. | ( <sub>s</sub>- <sub>i</sub>)nb = 8 <sub>s</sub> |
| Answer» B. ( <sub>s</sub>- <sub>i</sub>)nb = 3 <sub>s</sub> | |