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Engineering Materials - Interview Questions and Answers

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16. The machinability of steel is increased by
A. silicon and sulphur
B. phosphorous, lead and sulphur
C. sulphur, graphite and aluminium
D. phosphorous and aluminium
E. none of the above.
Explanation:
17. The percentage of carbon in low carbon steel is
A. 0.05%
B. 0.15%
C. 0.3%
D. 0.5%
E. 0.7%.
Explanation:
18. Which of the following elements does not impart hardness to steel
A. copper
B. chromium
C. nickel
D. silicon
E. none of the above.
Explanation:
19. Which of the following is not the correct method of increasing fatigue limit
A. shot peening
B. nitriding of surface
C. cold working
D. surface decarburisation
E. under-stressing.
Explanation:
20. Connecting rod is usually made of
A. aluminium
B. low carbon steel
C. medium carbon steel
D. high carbon steel
E. cast iron.
Explanation:
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