B.Tech-B.Tech Electrical and Electronics Engineering 2nd Sem CHEMISTRY (Acharya Nagarjuna University (ANU), Guntur, Andhra Pradesh-2012)

B.Tech. DEGREE EXAMINATION, MAY 2012.
(Examination at the end of First Year)
Paper IV — CHEMISTRY
Time : Three hours Maximum : 75 marks
Answer Question No. 1 Compulsorily. (15 × 1 = 15)
Answer ONE question from each Unit. (4 × 15 = 60)
1. (a) What salts are responsible for hardness of water?
(b) Write about various impurities in water.
(c) What is meant by demineralization of water?
(d) Write the structure of fcc crystal.
(e) What are the differences between conductors and insulators?
(f) Write the preparation of polyester.
(g) What is meant by thermosetting of plastics?
(h) Write the equations at cathode and anode.
(i) Explain alkaline fuel cell.
(j) What is the principle of electroplating?
(k) What are p type and n-type semi-conductors?
(l) Define plane of symmetry.
(m) What is meant by stress corrosion?
(n) Write the structure of Buna – S rubber.
(o) How do you represent an electrochemical cell?
UNIT I
2. (a) How do you rectify the Boiler troubles due to hard water?
(b) Explain the principle and applications of reverse osmosis. Or
(c) Write the purification of principal water by sedimentation and filtration methods.
(d) Explain the principle and applications of electrodialysis.
UNIT II
3. (a) Explain point defects in crystals. Write the applications of crystal defects.
(b) Write about electron sea model.
Or
(c) Explain the free radical polymerization reaction with mechanism.
(d) Write the preparation and applications of PVC and Bakelite.
UNIT III
4. (a) What are electrochemical series and explain their importance?
(b) Write the preparation, structure and applications of polyurethane rubber.
Or
(c) Explain the construction and working principle of modern lithium batteries.
Mention their advantages.
(d) What are fuel cells? Write the applications of Fuel cells.
UNIT IV
5. (a) Explain the electrochemical theory of corrosion.
(b) Write about the preventive methods for corrosion.
Or
(c) Explain various types of corrosion and the factors affecting corrosion.
(d) Write about various liquid crystals used in information technology.