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Engineering Materials - Interview Questions and Answers

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11. Melting point of iron is
A. 1539�C
B. 1601�C
C. 1489�C
D. 1712�C
E. 1131�C.
Explanation:
12. Which of lh6 following pipes is least corrosion resistant
A. brass
B. mild steel
C. cast iron
D. wrought iron
E. copper.
Explanation:
13. Which of the following constituents of steels is softest and least strong
A. austenite
B. pearlite
C. ferrite
D. cementlte
E. bainite.
Explanation:
14. White cast iron
A. contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron
B. is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
C. is produced by annealing process. It is soft, tough and easily machined metal
D. is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material
E. none of the above.
Explanation:
15. The following element can't impart high strength at elevated temperature
A. manganese
B. magnesium
C. nickel
D. silicon
E. none of the above.
Explanation:
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