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 the correct sequence of grinding cemented carbides? |
| A. | Rough grinding |
| B. | Coarse grinding, polishing, and fine grinding |
| C. | Rough grinding, and final grinding |
| D. | Fine grinding |
| Answer» D. Fine grinding | |
| 2. |
Which of the following is not a characteristic of hot-pressed material? |
| A. | Hard |
| B. | Ductile |
| C. | Wear- resistant |
| D. | Zero residual porosity |
| Answer» C. Wear- resistant | |
| 3. |
_________ is used to produce large carbide balls, bushes and hollow sections with more uniform density. |
| A. | Isostatic pressing |
| B. | Extrusion compaction |
| C. | Rolling |
| D. | Forging |
| Answer» B. Extrusion compaction | |
| 4. |
Milled powder mixtures are unsuitable for automatic pressing in comparison to agglomerated carbide-cobalt powder mixtures. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 5. |
During _______, no liquid phase forms and ________ of only the binder metal occurs. |
| A. | Pre-sintering, liquid phase sintering |
| B. | Liquid phase sintering, pre-sintering |
| C. | Pre-sintering, solid phase sintering |
| D. | Solid phase sintering, pre-sintering |
| Answer» D. Solid phase sintering, pre-sintering | |
| 6. |
The classical method of production of cemented carbide tips is ________ |
| A. | Hot pressing |
| B. | Infiltration |
| C. | Double-sintering |
| D. | Liquid phase sintering |
| Answer» D. Liquid phase sintering | |
| 7. |
In which organic liquid is the lubricant, paraffin wax dissolved? |
| A. | Gasoline |
| B. | Ether |
| C. | Light hydrocarbons |
| D. | Alcohol |
| Answer» B. Ether | |
| 8. |
Which of the following is not a characteristic of vibratory mill used for milling of cemented carbide? |
| A. | Shorter milling time (1-2 days) |
| B. | Wear of balls and mills is reduced |
| C. | Ratio of powders to balls in mills = 1:3.5 1:5.5 |
| D. | Ratio of powders to balls in mills = 1:1 1:3 |
| Answer» E. | |
| 9. |
______ carbide alloys possess better resistance to diffusion wear under seizure conditions. |
| A. | Medium-grained |
| B. | Ultra-fine grained |
| C. | Coarse-grained |
| D. | Fine-grained |
| Answer» D. Fine-grained | |