MCQOPTIONS
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MCQOPTIONS
This section includes 13 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. |
A vacancy is a must for self-diffusion. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
Climb of edge dislocation is a chief recovery in FCC metals. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
Decreasing creep rate in transient creep is because of _________ dislocation density. |
| A. | Increased |
| B. | Decreased |
| C. | Zero |
| D. | Locked |
| Answer» B. Decreased | |
| 4. |
Decreasing creep rate during __________ arises from increasing dislocation density. |
| A. | Secondary creep |
| B. | Viscous creep |
| C. | Transient creep |
| D. | Tertiary creep |
| Answer» D. Tertiary creep | |
| 5. |
Why does creep rate decrease with time at a low temperature? |
| A. | Vacancy movement |
| B. | Activation energy unavailable |
| C. | Dislocation movement |
| D. | Kinetic energy low |
| Answer» C. Dislocation movement | |
| 6. |
At lower temperatures creep rate _________ with time. |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | First increases, then decrease |
| Answer» C. Remains constant | |
| 7. |
The transient creep described mathematically by _________ is expressed logarithmically by _________ |
| A. | Andrade, Manson |
| B. | Andrade, Cottrell |
| C. | Coffin, Manson |
| D. | W.A. Wood, Orowan |
| Answer» C. Coffin, Manson | |
| 8. |
What are the predominant recovery processes? |
| A. | Cross slip of screw dislocations |
| B. | Cross slip of edge dislocations |
| C. | Climbing of screw dislocations |
| D. | Climbing of edge dislocations |
| Answer» B. Cross slip of edge dislocations | |
| 9. |
Creep rate according to Cottrell equation depends on the activation energy to move ______ |
| A. | Dislocations |
| B. | Jogs |
| C. | Kinks |
| D. | Solute atoms |
| Answer» B. Jogs | |
| 10. |
When material under stress is heated, creep rate ______ with time. |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | First increases, then decrease |
| Answer» B. Decreases | |
| 11. |
The stress that a material can withstand for a specified period of time without excessive deformation at higher temperature is ______ |
| A. | Fatigue strength |
| B. | Creep strength |
| C. | Tensile strength |
| D. | Yield strength |
| Answer» C. Tensile strength | |
| 12. |
What is the predominant process below 0.5 Tm? |
| A. | Viscous creep |
| B. | Tertiary stage |
| C. | Secondary stage |
| D. | Transient creep |
| Answer» E. | |
| 13. |
At lower temperature (below 0.3 Tm), what causes creep phenomenon? |
| A. | Diffusion process |
| B. | Diffusion less process |
| C. | Recrystallization |
| D. | Softening |
| Answer» C. Recrystallization | |