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 nil ductility temperature (NDT) was used in world war-II for analysis of breaking ship. The NDT is defined as the ______ |
| A. | maximum temperature where fracture is 100% brittle |
| B. | minimum temperature where fracture is 100% ductile |
| C. | maximum Temperature where fracture is 50% brittle and 50% ductile |
| D. | maximum Temperature above which the fracture is 100% ductile |
| Answer» C. maximum Temperature where fracture is 50% brittle and 50% ductile | |
| 2. |
The fracture appearance transition temperature (FATT) point is defined as the _______ |
| A. | point where fracture is 100% brittle |
| B. | point where fracture is 100% ductile |
| C. | point where fracture is 50% brittle and 50% ductile |
| D. | point above which the fracture is 100% ductile |
| Answer» D. point above which the fracture is 100% ductile | |
| 3. |
The fracture transition plastic (FTP) point is defined as __________ |
| A. | point where fracture is 100% brittle |
| B. | point where fracture is 100% ductile |
| C. | point where fracture is 50% brittle and 50% ductile |
| D. | point above which the fracture is 100% ductile |
| Answer» E. | |
| 4. |
12.The ductile to brittle transition temperature in ceramic is around ____ of melting point (Tm)? |
| A. | 0.1 T<sub>m</sub> |
| B. | 0.5 T<sub>m</sub> |
| C. | 0.9 T<sub>m</sub> |
| D. | 0.0001 T<sub>m</sub> |
| Answer» C. 0.9 T<sub>m</sub> | |
| 5. |
The ductile to brittle transition temperature in metal is around ____ of melting point (Tm)? |
| A. | 0.1 T<sub>m</sub> |
| B. | 0.5 T<sub>m</sub> |
| C. | 0.9 T<sub>m</sub> |
| D. | 0.0001 T<sub>m</sub> |
| Answer» B. 0.5 T<sub>m</sub> | |
| 6. |
Which of the following material has highest tendency for ductile to brittle transition? |
| A. | FCC |
| B. | HCP |
| C. | BCC |
| D. | DBTT does depends on crystal structure |
| Answer» D. DBTT does depends on crystal structure | |
| 7. |
The nature of fracture in charpy test is not determine by __________ |
| A. | distance hammer travelled after impact |
| B. | appearance of the fracture surface |
| C. | the amount of energy absorbed |
| D. | the type of loading |
| Answer» E. | |
| 8. |
The principle result in the impact test is the energy absorbed in the fracturing of the sample. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
The maximum plastic stress concentration accumulated at the crack tip, is given by ________ (where w is the included flank angle of the notch). |
| A. | K<sub> </sub>=[1+( /2)-(w/2)] |
| B. | K<sub> </sub>=[1+( /2)+(w/2)] |
| C. | K<sub> </sub>=[1+( /2)(w/2)] |
| D. | K<sub> </sub>=[1-( /2)-(w/2)] |
| Answer» B. K<sub> </sub>=[1+( /2)+(w/2)] | |
| 10. |
In both the Charpy and Izod impact testing, the load is applied from the backside on notch for causing fracture. |
| A. | True |
| B. | False |
| Answer» C. | |
| 11. |
Which of the following is not among the basic condition responsible for causing the fracture of brittle? |
| A. | A triaxle state of stress |
| B. | Low temperature |
| C. | High strain rate |
| D. | Large sample width |
| Answer» E. | |