MCQOPTIONS
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MCQOPTIONS
This section includes 10 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. |
______ is carried out after sintering of self-lubricating bearings. |
| A. | Sizing |
| B. | Impregnation |
| C. | Plating |
| D. | Joining |
| Answer» B. Impregnation | |
| 2. |
Iron base bearings are sintered at _______ |
| A. | 1500-1800°C |
| B. | 900-1000°C |
| C. | 800-850°C |
| D. | 1100-1125°C |
| Answer» E. | |
| 3. |
Which of the following atmosphere is used for the sintering of bronze bearings? |
| A. | Reducing |
| B. | Oxidizing |
| C. | Protective |
| D. | Vacuum |
| Answer» B. Oxidizing | |
| 4. |
The microstructure of sintered copper base self-lubricating bearing consists of ________ |
| A. | pores |
| B. | graphite particles |
| C. | alpha phase, graphite particles |
| D. | alpha phase, graphite particles, and pores |
| Answer» E. | |
| 5. |
What is the compaction pressure range used for bronze bearings? |
| A. | 775-1000 MPa |
| B. | 500-800 MPa |
| C. | 275-480 MPa |
| D. | 200-300 MPa |
| Answer» D. 200-300 MPa | |
| 6. |
Green density distribution is an important factor for production of porous bearings. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7. |
Mixing of elemental powder is essential prior to compaction. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
_______ base bearings, atomized or reduced powders are employed. |
| A. | Bismuth |
| B. | Bronze |
| C. | Iron |
| D. | Tin |
| Answer» D. Tin | |
| 9. |
Tin powder is made by _________ |
| A. | Atomization |
| B. | Electrolysis |
| C. | Reduction |
| D. | Cold stream process |
| Answer» B. Electrolysis | |
| 10. |
_______ are bearings containing bronze or iron powder mixed with graphite. |
| A. | Hydrocarbon impregnated |
| B. | Oil impregnated |
| C. | Plastic impregnated |
| D. | Metal impregnated |
| Answer» C. Plastic impregnated | |