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[QUOTE=hemalathaijt;190478][B]B.E. DEGREE EXAMINATION.
Second Semester
Aeronautical Engineering
CM 134 — CHEMISTRY — II
(Common to Production Engineering)
Time : [/B]Three hours [B]Maximum : [/B]100 marks

[URL]http://www.annauniv.edu/academic/qp4.htm[/URL]
[URL="http://www.annauniv.edu/academic/m018.doc"]www.annauniv.edu/academic/m018.doc[/URL]

Answer ALL questions.
PART A — (10 ? 2 = 20 marks)

1.What are the components of acidic dry cell?  Write its electrode reaction, and indicate its disadvantages.
2.What are the functions of carbon in steel?  Explain the role of manganese in carbon steel.
3.Write explanatory note on detonation.
4.Define cetane number.  Mention diesel additives, and explain how they reduce knock.
5.Define BOD and COD.  What are their implications?
6.What is inferred from DO content of water?  Explain how it is estimated for water samples.
7.What are abrasives?  Give their uses.  Explain why diamond is strong.
8.What are refectories?  Write explanatory note on the thermal conductivity and dimensional stability of them.
9.What are fuel cells?  How do they differ from internal combustion engines and batteries?
10.Write a note on powder metallurgy.

PART B — (5 ? 16 = 80 marks)
11.(i)What is heat treatment with respect to steel?  Why is it necessary? How is it done by annealing and tempering?
(ii)Explain why alloying of metal is necessary.
(iii)Write a note on heat resisting steels.[/QUOTE]

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