Mechanical Engineering : Engineering Materials QUESTIONS AND ANSWERS :: part2 : 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.Chilled cast iron has |
| no graphite |
| a very high percentage of graphite |
| a low percentage of graphite |
| graphite as its basic constituent of composition |
| none of the above is true. |
7.The percentage of carbon in grey iron castings usually varies between |
| 0.5 to 1% |
| 1 - 2% |
| 2.5 to 4.5% |
| 5 - 7% |
| 7-9%. |
8.Pig iron is the name given to |
| raw material for blast furnace |
| product of blast furnace made by reduction of iron ore |
| iron containing huge quantities of carbon |
| iron in molten form in the ladles |
| iron scrap. |
9.A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as |
| allotropic change |
| recrystallization |
| heat treatment |
| precipitation |
| austempering. |
10.The crystal structure of gamma iron is |
| body centred cubic |
| face centred cubic |
| hexagonal close packed |
| cubic structure |
| orthorhombic crystal. |
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