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 stress required to move a dislocation when the width of dislocation is equal to the Burger s vector of the dislocation? |
| A. | G |
| B. | G/10<sup>27</sup> |
| C. | G/400 |
| D. | G/2 |
| Answer» D. G/2 | |
| 2. |
The Peierls stress (stress required to move the dislocation) will be least in which type of crystal element? |
| A. | Covalent compound |
| B. | Metallic compound |
| C. | Ionic compound |
| D. | Intermetallic compound |
| Answer» C. Ionic compound | |
| 3. |
The force required to move a dislocation is known as ____________ |
| A. | peierls-nabarro force |
| B. | hearing-nabarro force |
| C. | drag force |
| D. | frictional force |
| Answer» B. hearing-nabarro force | |
| 4. |
Theoretical shear strength of metal range in _______ |
| A. | GPa |
| B. | MPa |
| C. | KPa |
| D. | Pa |
| Answer» B. MPa | |
| 5. |
The theoretical shear strength of perfect crystal is approximately equal to ___________ |
| A. | G/2 |
| B. | G/4 |
| C. | 2 G |
| D. | G |
| Answer» B. G/4 | |
| 6. |
Which of the following is not a reason for the wavy appearance Slip lines in bcc metals? |
| A. | The slip occurs on several planes, (110), (112), (123) but always in the close-packed (111) direction |
| B. | Dislocations can readily move from one type of plane to another by cross sip |
| C. | Higher shearing stresses are required to cross-slip |
| D. | The ductile nature of BCC causes wavy nature |
| Answer» E. | |
| 7. |
Which of the following is not a slip system in body centered cubic lattice? |
| A. | {110} <111> |
| B. | {112} <111> |
| C. | {123} <111> |
| D. | {112} <111> |
| Answer» E. | |
| 8. |
What is closed packed direction body-centered cubic system? |
| A. | <111> |
| B. | <110> |
| C. | <100> |
| D. | <122> |
| Answer» B. <110> | |
| 9. |
In the face-centered cubic structure, the (111) octahedral planes and the (110) directions are the close-packed systems. What is the total number of possible slip system in FCC? |
| A. | 8 |
| B. | 12 |
| C. | 48 |
| D. | 16 |
| Answer» C. 48 | |
| 10. |
The closed packed plane and close packed direction of hexagonal closed packed structure is _________ and _____________ respectively. |
| A. | (0001) and <1120> |
| B. | (0112) and <0001> |
| C. | (1120) and <1120> |
| D. | (0012) and <1212> |
| Answer» B. (0112) and <0001> | |