MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Powder Metallurgy knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following is not a mechanism of by which surface transportation occur during solid-state sintering? |
| A. | Plastic flow |
| B. | Volume diffusion |
| C. | Viscous flow |
| D. | Surface diffusion |
| Answer» E. | |
| 2. |
________ is the mechanism by which bulk transportation can take place in solid-state sintering. |
| A. | Surface diffusion |
| B. | Plastic flow |
| C. | Adhesion |
| D. | Evaporation-condensation |
| Answer» C. Adhesion | |
| 3. |
The driving force for the various stages of solid-state sintering are ________ and ________ |
| A. | Lattice diffusion and capillary force |
| B. | Surface tension forces and diffusional flow |
| C. | Surface tension forces and plastic flow |
| D. | Lattice diffusion and surface tension force |
| Answer» C. Surface tension forces and plastic flow | |
| 4. |
The ________ gradient is high for small neck size leading to faster sintering. |
| A. | Curvature |
| B. | Linear |
| C. | Volume |
| D. | Velocity |
| Answer» B. Linear | |
| 5. |
In the second stage of sintering, with sufficient neck growth, the pore channels become more _______ in nature. |
| A. | Spherical |
| B. | Cylindrical |
| C. | Cubical |
| D. | Linear |
| Answer» C. Cubical | |
| 6. |
In which stage of solid-state sintering the pores are interconnected and pore shape is irregular? |
| A. | 1<sup>st</sup> |
| B. | 2<sup>nd</sup> |
| C. | 3<sup>rd</sup> |
| D. | 4<sup>th</sup> |
| Answer» B. 2<sup>nd</sup> | |
| 7. |
The first stage of solid-state sintering, includes _______ of vacancies and ________ between surface regions with different radii of curvature. |
| A. | Surface diffusion, volume diffusion |
| B. | Volume diffusion, surface diffusion |
| C. | Lattice diffusion, surface diffusion |
| D. | Plastic flow, surface diffusion |
| Answer» C. Lattice diffusion, surface diffusion | |
| 8. |
In final stage of solid-state sintering, _____ become isolated and are no longer _______ |
| A. | Grains, connected |
| B. | Grains, interconnected |
| C. | Pores, open |
| D. | Pores, interconnected |
| Answer» E. | |
| 9. |
Solid-state sintering can be broadly divided into _____ stages. |
| A. | Adhesion, and Densification |
| B. | Adhesion, Densification, and spheroidization of isolated pores |
| C. | Adhesion, and grain growth |
| D. | Initial bonding, and spheroidization of isolated pores |
| Answer» C. Adhesion, and grain growth | |