MCQOPTIONS
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MCQOPTIONS
This section includes 8 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. |
When a liquid drop is in contact with a solid surface, the contact angle at equilibrium is given by ______ |
| A. | cos = ( frac{ gamma_{GS}- gamma_{SL}}{ gamma_{LG}} ) |
| B. | sin = ( frac{ gamma_{GS}- gamma_{SL}}{ gamma_{LG}} ) |
| C. | cos = ( frac{ gamma_{SL}- gamma_{GS}}{ gamma_{LG}} ) |
| D. | cos = ( frac{ gamma_{LG}- gamma_{SL}}{ gamma_{GS}} ) |
| Answer» B. sin = ( frac{ gamma_{GS}- gamma_{SL}}{ gamma_{LG}} ) | |
| 2. |
Which of the following is the correct sequence for liquid phase sintering? |
| A. | Liquid flow stage Precipitation stage Solid-state sintering stage |
| B. | Liquid flow stage Condensation stage Liquid-state sintering stage |
| C. | Liquid flow stage Solution and reprecipitation stage Liquid-state sintering stage |
| D. | Liquid flow stage Solution and reprecipitation stage Solid-state sintering stage |
| Answer» E. | |
| 3. |
______ is the form of liquid phase sintering where liquid formed is temporary in nature. |
| A. | Transient liquid phase sintering |
| B. | Persistent liquid phase sintering |
| C. | Transistor liquid phase sintering |
| D. | Progressive liquid phase sintering |
| Answer» B. Persistent liquid phase sintering | |
| 4. |
Which of the is the must consideration for liquid phase sintering to occur? |
| A. | Incomplete wetting of liquid in solid |
| B. | Appreciable insolubility of solid in liquid |
| C. | Presence of a limited amount of liquid phase |
| D. | Appreciable solubility of solid in liquid |
| Answer» E. | |
| 5. |
_________ is an example of multicomponent sintering. |
| A. | Liquid phase sintering |
| B. | Solid-state sintering |
| C. | Microwave sintering |
| D. | Reaction sintering |
| Answer» B. Solid-state sintering | |
| 6. |
The __________ is the motion of the interface that occurs due to the difference in diffusion rates of the metal atoms. |
| A. | Darkens effect |
| B. | Schroter effect |
| C. | Kirkendall effect |
| D. | Harmer effect |
| Answer» D. Harmer effect | |
| 7. |
Enhanced volume diffusion is the reason for adding Ni for activated sintering of refractory metals. |
| A. | True |
| B. | False |
| Answer» C. | |
| 8. |
In sintering of multicomponent systems, the material transport mechanisms involve ______ |
| A. | Self-diffusion |
| B. | Self-diffusion and inter-diffusion |
| C. | Inter-diffusion |
| D. | Intra-diffusion and self-diffusion |
| Answer» C. Inter-diffusion | |