MCQOPTIONS
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MCQOPTIONS
This section includes 12 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. |
Why infiltrated pump cylinder blocks are popular in use? |
| A. | Mechanical strength |
| B. | Resistance to thermal stress |
| C. | Pressure- tightness |
| D. | Light-weight |
| Answer» D. Light-weight | |
| 2. |
Why alloy infiltrant is used for the production of copper-infiltrated ferrous base materials? |
| A. | Cost-saving |
| B. | Reduce erosion of contact surfaces of the skeleton |
| C. | Material saving |
| D. | Variety production |
| Answer» C. Material saving | |
| 3. |
Erosion of the contact surfaces of the skeleton metal can be reduced by ______ method. |
| A. | Bridge method |
| B. | Oil method |
| C. | Flyover method |
| D. | Compensation method |
| Answer» B. Oil method | |
| 4. |
The infiltration process is used to prepare ____ kinds of material. |
| A. | Single phase materials |
| B. | Duplex materials |
| C. | Single phase, and duplex materials |
| D. | Multicomponent materials |
| Answer» D. Multicomponent materials | |
| 5. |
A _____ wetting angle promotes infiltration. |
| A. | low |
| B. | 0 |
| C. | 90 |
| D. | large |
| Answer» B. 0 | |
| 6. |
Which of the following changes does not improve the process of infiltration? |
| A. | Lowering the interfacial tension between skeleton and infiltrant |
| B. | Removing dissolved or adsorbed elements in the skeleton |
| C. | Increasing surface energy of the infiltrant |
| D. | Increasing the interfacial tension between skeleton and infiltrant |
| Answer» E. | |
| 7. |
__________ are among the most important P/M parts produced by infiltration. |
| A. | Electrical contacts |
| B. | Cermet |
| C. | Sintered carbides |
| D. | Porous P/M parts |
| Answer» B. Cermet | |
| 8. |
For infiltration, the porosity in the skeleton should be ________ |
| A. | Closed |
| B. | Interconnected |
| C. | Open |
| D. | Intermittent |
| Answer» C. Open | |
| 9. |
Which of the following is not a characteristic of infiltrant? |
| A. | Melting point lower than the skeleton metal |
| B. | High surface tension |
| C. | Good or perfect wetting |
| D. | Must not alloy or react with the skeleton metal |
| Answer» C. Good or perfect wetting | |
| 10. |
How many stages occur in the process of infiltration? |
| A. | 5 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 11. |
A continuous network of infiltrant metal is a must. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 12. |
______ process involves preparing a porous metallic body and filing its pores with a molten metal having a lower melting point. |
| A. | Liquid phase sintering |
| B. | Infiltration |
| C. | Densification |
| D. | Alloying |
| Answer» C. Densification | |