MCQOPTIONS
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MCQOPTIONS
This section includes 9 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. |
Which of the following microstructure of steel will have the lowest fatigue strength? |
| A. | Pearlite |
| B. | Globular |
| C. | Nodular |
| D. | Acicular |
| Answer» B. Globular | |
| 2. |
What will be the fatigue ratio of a notched specimen to an un-notched sample? |
| A. | The un-notched sample will have higher fatigue ratio |
| B. | The notched specimen will have higher fatigue ratio |
| C. | Both will have the same fatigue ratio |
| D. | Cannot comment |
| Answer» C. Both will have the same fatigue ratio | |
| 3. |
The ratio of fatigue limit to tensile limit is called _________ |
| A. | notch sensitivity factor |
| B. | fatigue strength reduction factor |
| C. | fatigue ratio |
| D. | stress concentration factor |
| Answer» D. stress concentration factor | |
| 4. |
The fatigue limit of the cast and wrought iron is around ___________ of tensile strength. |
| A. | 50% |
| B. | 90% |
| C. | 10% |
| D. | 1% |
| Answer» B. 90% | |
| 5. |
The infrequent tensile stress ____________ the fatigue life, whereas the infrequent compressive load ____________ fatigue life. |
| A. | increases, increases |
| B. | Increases, decreases |
| C. | decrease, increases |
| D. | decreases, decreases |
| Answer» C. decrease, increases | |
| 6. |
The minor s rule states that ____________ where n1, n2 is the number of cycle at the given stress level and N1, N2 are total number of cycle to failure at the given stress level. |
| A. | n<sub>1</sub>/N<sub>1</sub>+n<sub>2</sub>/N<sub>2</sub>+n<sub>3</sub>/N<sub>3</sub>+ ..+n<sub>k</sub>/N<sub>k</sub>=1 |
| B. | N<sub>1</sub>+N<sub>2</sub>+N<sub>3</sub>+ ..+N<sub>k</sub>=1 |
| C. | n<sub>1</sub>+n<sub>2</sub>+n<sub>3</sub>+ ..+n<sub>k</sub>=1 |
| D. | n<sub>1</sub>/N<sub>1</sub>+n<sub>2</sub>/N<sub>2</sub>+n<sub>3</sub>/N<sub>3</sub>+ ..+n<sub>k</sub>/N<sub>k</sub>=0 |
| Answer» B. N<sub>1</sub>+N<sub>2</sub>+N<sub>3</sub>+ ..+N<sub>k</sub>=1 | |
| 7. |
The Minor s rule is used to calculate the ____________ |
| A. | cumulative fatigue life |
| B. | endurance limit |
| C. | number of cycles to failure |
| D. | stress ratio |
| Answer» B. endurance limit | |
| 8. |
The fatigue failure of the material is cumulative property. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
The electroplating always has a positive effect on fatigue properties. |
| A. | True |
| B. | False |
| Answer» C. | |