Mechanical Engineering : Engineering Materials QUESTIONS AND ANSWERS :: part4 : 16 to 20
Following Mechanical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
16.Process of austempering results in |
| formation of bainite structure |
| carburised structure |
| martenistic structure |
| lamellar layers of carbide distributed throughout the structure |
| relieving of stresses throughout a com-ponent. |
17.Sulphur in steel |
| acts as deoxidiser |
| reduces the grain size |
| decreases tensile strength and hard-ness |
| lowers the toughness and transverse ductility |
| increases hardness. |
18.Hardness of lower bainite (tempered martensite) is about |
| RC 65 |
| RC 48 |
| RC 57 |
| RC 80 |
| RC 32. |
19.An example of amorphous material is |
| zinc |
| lead |
| silver |
| glass |
| brass. |
20.Carbon in iron is an example of |
| substitutional solution |
| interstitial solid solution |
| intermetallic compounds |
| all of the above |
| none of the above. |
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