Mechanical Engineering : Engineering Materials QUESTIONS AND ANSWERS :: part5 : 1 to 5
Following Mechanical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
1.Grey cast iron |
| contains 1.7 to 3.5% carbon in fre< state and is obtained by the slov cooling of molten cast iron |
| is also known as chilled cast iron am is obtained by cooling rapidly. It i: almost unmachinable |
| is produced by annealing process. I is soft, tough and easily machinec metal |
| is produced by small additions o magnesium (or cerium) in the ladle Graphite is in nodular or spheroida form and is well dispersed throughou the material |
| none of the above is true. |
2.The hardness of steel increases if it contains |
| austenite |
| martensite |
| pearlite |
| cementite |
| all of the above. |
3.Which of the following element results in presence of free graphite in C.I. |
| carbon |
| sulphur |
| silicon |
| manganese |
| phosphorous. |
4.Compressive strength of grey cast iron in tonnes/cm is of the order of |
| 3- 5 |
| 5-7 |
| 7-10 |
| 10-15 |
| 15-22. |
5.Cobalt in steel |
| improves wear resistance, cuttin ability and toughness |
| refines grain size and produces les tendency to caricaturisation, improve corrosion and heat resistant proper ties |
| improves cutting ability and reduce harden ability |
| gives ductility, toughness, tensil strength and anti corrosion properties: |
| none of the above. |
More Engineering Materials QUESTIONS AND ANSWERS available in next pages
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