MCQOPTIONS
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MCQOPTIONS
This section includes 20 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. |
Fatigue initiation only occurs in slip planes in FCC metals. |
| A. | True |
| B. | False |
| Answer» C. | |
| 2. |
Which of the following material fails by both hysteric heating and crack propagation? |
| A. | Nylon |
| B. | Polyethylene |
| C. | Propylene |
| D. | PMMA |
| Answer» E. | |
| 3. |
Which of the following materials is predominated by thermal failure? |
| A. | PMMA |
| B. | Actual |
| C. | Nylon |
| D. | Polycarbonate |
| Answer» D. Polycarbonate | |
| 4. |
Material with a high surface to volume ratio have _________ fatigue life. |
| A. | Very low fatigue life |
| B. | Very high fatigue life |
| C. | Lower fatigue life |
| D. | Improved fatigue life |
| Answer» E. | |
| 5. |
Stage of crack growth is called _________ |
| A. | I stage |
| B. | II stage |
| C. | III stage |
| D. | IV stage |
| Answer» C. III stage | |
| 6. |
Wood’s theory is described by _________ |
| A. | Microscopic voids |
| B. | Microscopic slip bands |
| C. | Weak crystal |
| D. | Grain boundaries |
| Answer» C. Weak crystal | |
| 7. |
Orowan’s theory is related to _________ |
| A. | Grain boundaries |
| B. | Weak crystal |
| C. | Slip band |
| D. | Gas pores |
| Answer» C. Slip band | |
| 8. |
WHICH_OF_THE_FOLLOWING_MATERIALS_IS_PREDOMINATED_BY_THERMAL_FAILURE??$ |
| A. | PMMA |
| B. | Actual |
| C. | Nylon |
| D. | Polycarbonate |
| Answer» D. Polycarbonate | |
| 9. |
Fatigue initiation only occurs in slip planes in FCC metals.$ |
| A. | True |
| B. | False |
| Answer» C. | |
| 10. |
Which of the following material fails by both hysteric heating and crack propagation?$ |
| A. | Nylon |
| B. | Polyethylene |
| C. | Propylene |
| D. | PMMA |
| Answer» E. | |
| 11. |
Paris-Erdogan relationship is applicable to some ceramics and plastics along with metals. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 12. |
Material with a high surface to volume ratio have _________ fatigue life? |
| A. | Very low fatigue life |
| B. | Very high fatigue life |
| C. | Lower fatigue life |
| D. | Improved fatigue life |
| Answer» E. | |
| 13. |
Stage of crack growth is called ________? |
| A. | I stage |
| B. | II stage |
| C. | III stage |
| D. | IV stage |
| Answer» C. III stage | |
| 14. |
What term is used for initial crack formation during fatigue? |
| A. | Cracking |
| B. | Stage I fatigue |
| C. | Stage II fatigue |
| D. | Micro cracking |
| Answer» C. Stage II fatigue | |
| 15. |
Which theory defines fatigue failure using microscopic slip bands? |
| A. | Orowan’s theory |
| B. | Wood’s theory |
| C. | Cottrell’s theory |
| D. | Dislocation theory |
| Answer» C. Cottrell‚Äö√Ñ√∂‚àö√ë‚àö¬•s theory | |
| 16. |
Slip band are notch root of _________ dimensions. |
| A. | Micro |
| B. | Macro |
| C. | Nano |
| D. | Atomic |
| Answer» E. | |
| 17. |
Wood’s theory is described by _________$ |
| A. | Microscopic voids |
| B. | Microscopic slip bands |
| C. | Weak crystal |
| D. | Grain boundaries |
| Answer» C. Weak crystal | |
| 18. |
Orowan’s theory is related to _________$ |
| A. | Grain boundaries |
| B. | Weak crystal |
| C. | Slip band |
| D. | Gas pores |
| Answer» C. Slip band | |
| 19. |
Crack mostly starts at _________ |
| A. | Surface |
| B. | Inclusion |
| C. | Pore |
| D. | Soft spots |
| Answer» B. Inclusion | |
| 20. |
Which of the following is not a reason for crack initiation? |
| A. | Inclusions |
| B. | Gas pores |
| C. | Local soft spots |
| D. | Vacancy |
| Answer» E. | |