MCQOPTIONS
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MCQOPTIONS
This section includes 11 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. |
P/M bearings may be of the type ____________ |
| A. | dry type containing aluminum |
| B. | porous type infiltrated with a lubricant |
| C. | dry type containing teflon |
| D. | porous type infiltrated with a lubricant, dry type containing teflon |
| Answer» E. | |
| 2. |
The porous-metal bearings are used where re-lubrication is difficult. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3. |
What is the property of material for the application of fractional-horsepower motor bearings? |
| A. | Moderate porosity |
| B. | Low porosity |
| C. | Minimum lubricating oil |
| D. | High porosity |
| Answer» E. | |
| 4. |
Which kind of bearing material is suitable for oscillating and reciprocating motions? |
| A. | Low-graphite content |
| B. | High graphite content |
| C. | High-oil content |
| D. | High porosity |
| Answer» C. High-oil content | |
| 5. |
Dry bearing is made up of ______ with metal backing of _______ is available. |
| A. | teflon, aluminum |
| B. | aluminum, teflon |
| C. | leaded bronze, aluminum |
| D. | teflon, bismuth |
| Answer» B. aluminum, teflon | |
| 6. |
Which of the following is not a feature of oil-impregnated bearings? |
| A. | Excellent self-lubrication properties |
| B. | Wide range of operating temperature |
| C. | High-thermal expansion |
| D. | Low-thermal expansion |
| Answer» D. Low-thermal expansion | |
| 7. |
What should be added to the iron powder mix to improve the speed capability? |
| A. | Bismuth |
| B. | Lead |
| C. | Vanadium |
| D. | Molybdenum |
| Answer» C. Vanadium | |
| 8. |
Copper is added to iron-copper-graphite powder mix to suppress the formation of ________ |
| A. | Cementite |
| B. | Iron oxide |
| C. | Copper oxide |
| D. | Ledeburite |
| Answer» B. Iron oxide | |
| 9. |
Which of the following is not a characteristic of the bearings produced from iron? |
| A. | Good wear resistance |
| B. | High-oil-volume capacity |
| C. | High porosity |
| D. | Low-oil-volume capacity |
| Answer» E. | |
| 10. |
Which of the following substance is added to iron powder to improve the compressive strength of bearing? |
| A. | Bismuth |
| B. | Zinc |
| C. | Copper |
| D. | Lead |
| Answer» D. Lead | |
| 11. |
What is the pore volume in bearing materials? |
| A. | 14-20% |
| B. | 17-30% |
| C. | 11-50% |
| D. | 28-43% |
| Answer» C. 11-50% | |