MCQOPTIONS
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MCQOPTIONS
This section includes 13 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. |
DQ and DQ2 are the two types bearings produced by Glacier Metal Co. Ltd. by dispersing brass and Pb respectively. |
| A. | True |
| B. | False |
| Answer» C. | |
| 2. |
The performance of P.T.F.E /metal bearings largely depends on _________ |
| A. | Base material |
| B. | Compacting pressure |
| C. | Journal material |
| D. | Sintering temperature |
| Answer» D. Sintering temperature | |
| 3. |
Which of the following is the limitation of aqueous impregnation method? |
| A. | Easy to get a penetration depth > 0.01 |
| B. | Suitable for flat sheets only |
| C. | Suitable for curved sections only |
| D. | No loss of P.T.F.E by extrusion |
| Answer» C. Suitable for curved sections only | |
| 4. |
Which of the following are methods for impregnating the metallic matrix with P.T.F.E, according to Blainey? |
| A. | Hot pressing |
| B. | Hot rolling, and aqueous impregnation |
| C. | Hot rolling |
| D. | Hot pressing, and aqueous impregnation |
| Answer» E. | |
| 5. |
Which of the following is a drawback of the P.T.F.E material for bearings? |
| A. | High thermal expansion |
| B. | High thermal conductivity |
| C. | High shear strength |
| D. | Non-toxic |
| Answer» B. High thermal conductivity | |
| 6. |
Which of the following is not a feature related to the P.T.F.E material for bearings? |
| A. | Low coefficient of friction |
| B. | Sintering temperature is 90 C |
| C. | Sintering temperature is 900 C |
| D. | Chemical stability from -200 C up to 300 C |
| Answer» D. Chemical stability from -200 C up to 300 C | |
| 7. |
_________ are used in hot water circulating pump. |
| A. | P.T.F.E bearing |
| B. | Non-porous bearing |
| C. | Infiltrated bearing |
| D. | Dry-lubricated bearing incorporating graphite |
| Answer» E. | |
| 8. |
Overlay layer of lead-tin alloy on copper-lead alloy has reduced fatigue properties. |
| A. | True |
| B. | False |
| Answer» C. | |
| 9. |
_________ are employed in gearboxes. |
| A. | Copper-lead bearings |
| B. | Lead-tin alloy |
| C. | Self-lubricating bearing |
| D. | Infiltrated bearing |
| Answer» B. Lead-tin alloy | |
| 10. |
__________ is used in food industries. |
| A. | P.T.F.E bearing |
| B. | Non-porous bearing |
| C. | Infiltrated bearing |
| D. | Dry-lubricated bearing incorporating graphite |
| Answer» D. Dry-lubricated bearing incorporating graphite | |
| 11. |
________ clearance for higher PV values are required. |
| A. | Small |
| B. | Large |
| C. | Moderate |
| D. | Nil |
| Answer» C. Moderate | |
| 12. |
The ratio of interference to bore closure doesn t rely on ______ |
| A. | density of bearing |
| B. | rigidity of housing |
| C. | density of shaft |
| D. | strength of bearing |
| Answer» D. strength of bearing | |
| 13. |
The radial crushing strength of a bearing is given by _______ |
| A. | P=KLT<sup>2</sup>/(D-T) |
| B. | P=KLT<sup>2</sup>/(T-D) |
| C. | P=KDT<sup>2</sup>/(L-T) |
| D. | P=KLT<sup>3</sup>/(T-D) |
| Answer» B. P=KLT<sup>2</sup>/(T-D) | |