MCQOPTIONS
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MCQOPTIONS
This section includes 12 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Behaviour knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Microcracks can be used to toughen the ceramics. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
R-curve behaviour is a material related property. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
What is the volume % change in a transformation from tetragonal to monoclinic? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 4. |
What is the structure of zirconia in a temperature range of 1100 to 2360 C? |
| A. | Monoclinic |
| B. | Cubic |
| C. | Tetragonal |
| D. | Hexagonal |
| Answer» D. Hexagonal | |
| 5. |
In what temperature range zirconia is cubic? |
| A. | Below 1100 C |
| B. | 1100-2360 C |
| C. | 2360-2680 C |
| D. | Above 2680 C |
| Answer» E. | |
| 6. |
In which technique ceramics are toughened by incorporation of second phase whiskers? |
| A. | Crack deflection |
| B. | Transformation |
| C. | Crack bridging |
| D. | Microcrack |
| Answer» B. Transformation | |
| 7. |
Which materials show steeply rising R-curve? |
| A. | High toughness and strength |
| B. | High toughness / low strength |
| C. | Low toughness / strength |
| D. | Low toughness and strength |
| Answer» D. Low toughness and strength | |
| 8. |
Which material shows a gradual rising R-curve with failure governed by R-curve behaviour? |
| A. | High toughness and strength |
| B. | High toughness / low strength |
| C. | Low toughness / strength |
| D. | Low toughness and strength |
| Answer» C. Low toughness / strength | |
| 9. |
What is on X and Y axis on R-curves? |
| A. | Stress intensity factor versus crack length |
| B. | Fracture surface energy versus crack length |
| C. | Critical fracture stress versus elastic modulus. |
| D. | Critical fracture stress versus fracture strength |
| Answer» B. Fracture surface energy versus crack length | |
| 10. |
What is an example of alloyed ceramic? |
| A. | Pewter |
| B. | Sialon |
| C. | Monel |
| D. | Amalgam |
| Answer» C. Monel | |
| 11. |
What is the relation between critical fracture stress and flaw size? |
| A. | <sub>fr</sub> a |
| B. | <sub>fr</sub> a<sup>2</sup> |
| C. | <sub>fr</sub> 1/a |
| D. | <sub>fr</sub> 1/(a)<sup>1/2</sup> |
| Answer» E. | |
| 12. |
What is the reason for limited applications of ceramics in structural applications? |
| A. | Brittle nature |
| B. | Poor surface finish |
| C. | Poor aesthetic |
| D. | Less tensile strength. |
| Answer» B. Poor surface finish | |