Mechanical Engineering : Engineering Materials QUESTIONS AND ANSWERS :: part1 : 6 to 10
Following Mechanical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
6.Which of the following represents the allotropic forms of iron |
| alpha iron, beta iron and gamma iron |
| alpha iron and beta iron |
| body centered cubic a-iron and face centered cubic a-iron |
| alpha iron, gamma from and delta iron |
| none of the above. |
7.Ferromagnetic alpha iron exists in temperature range of |
| below 723�C |
| 770 - 910�C |
| 910-1440�C |
| 1400-1539�C |
| above 1539�C. |
8.Slow plastic defoliation of metals under a constant stress is known as |
| creep |
| fatigue |
| endurance |
| plastic deformation |
| non-plastic deformation. |
9.The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is |
| 770�C |
| 910�C |
| 1050�C |
| below recrystallization temperature |
| above recrystallization temperature. |
10.Mild steel belongs to the following category |
| low carbon steel |
| medium carbon steel |
| high carbon steel |
| alloy steel |
| special steel. |
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