Cochin University of Science and Techology (CUST) 2006-2nd Sem B.Tech Computer Science and Engineering I &,, Engineering chemistry - Question Paper

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U a) How are BOD and COD ex wrunentally determined?    (5) b) 20ml of standard hard watet (containing I5g cakium carbonax per litre) required 25ml of COTA solution for endpoint. 100ml of water sample required 18ml EOTA solution while same water after boiling required 12ml EDTA tohition. Calculate

<) Explain scale sludge format ton in bolters    (9)

III    a) What are the constituents of varnish?    (5) b) Distinguish between gaKar ic corrosion and pining corrosion    (6) C) Write a nott on:

(i) tinning    (ii) phosph Kc costing

(iii) effect of pH on the rate of corrosion.    (9) OR

IV    a) Give any two methods of c caning articles before electro deposition.    (3)

c)    Explain any three theories cfcorrosion    (9)

V    a) Give the workwg of hydrogen-oxygcn fi>e! cell.    (5)

OR

VI    a) What b a standard celt? Gi,-e an example.    (S) b) Whai ts a standard hydroge i electrode? Give its use.    (6) e) What ts a concentration cell? Give its applications.    (9)

VI) a) Explain the manufacture ofwafer gas.    (6)

OR

VIII    a) Write a note on reforming.    (6)

c)    Explain the manufacture of coke by Ono Hoffmans by-prodict oven method    (S)

IX    a) Write a note oo vulcanization of rubber.    (5)

c)    Write notes on

i) amino resin    ii) polyste'

iii) polyurethane    (9) OR

X    a) Write note on silicone resins.    ($) b) Dimnguishbetweencomprusionmoutdingandextrusionmculding.    (6) C) Write nous on :

(i) nylon    (ii) bakelit"

(iii) nitrile rut-ber    (9)