Jawaharlal Nehru Technological University Hyderabad 2003 B.Tech Production Engineering I Supplementary s, ember- ENGINEERING CHEMISTRY - exam paper

Code No.NR-10104

I B.Tech. Supplementary Examinations, November-2003

ENGINEERING CHEMISTRY
(Common to Civil Engineering, Mechanical Engineering, Production Engineering, Mechatronics and Aeronautical Engineering)
Time: three hours Max. Marks: 80
ans any 5 ques.
All ques. carry equal marks
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1.a) Give an account of the compounding of plastics.
b) With the help of neat diagrams, discuss the subsequent fabrication techniques.
(i) Injection moulding (ii) Extrusion moulding (iii) Compression moulding.

2. How are the subsequent protective coatings useful in the protection of metals from environmental attack?
(a) Galvanization (b) Cementation (c) Vitreous coatings (d) Varnishes.

3.a) What are scales? How are they formed? Write an account of the disadvantages and prevention of scales.
b) A zeolite softner was exhausted completely when 10,000 liters of hard water was passed through it. The softner needed 250 liters of Nacl solution of strength 50 gms per liter. compute the hardness of water in ppm.

4.a) Explain the ultimate analysis of coal and its significance.
b) Give an account of the synthesis of petrol from coal.

5.a) What are the functions of refractories? provide an account of the criteria of a good refractory material.
b) How are the insulators classified? define the characteristics of a good electrical insulating material.

6. How are the subsequent criteria useful in determining the efficiency of a good lubricating material?
a) Viscosity b) Aniline point c) Cloud and pour point d) Carbon residue.

7.a) What are the ingredients of cement? discuss the manufacture of cement by wet process by giving the relevant chemical reactions involved.
b) Give an account of the determination of alkalinity of water.

8.a) How is producer gas manufactured? elaborate its composition, calorific value and applications?
b) A gaseous fuel has the subsequent percentage composition CH4 = 22%, H2 = 10% CO = 26%, O2 = 2% the reminder being N2. compute the quantity of air needed for the complete combustion of 100 m3 of fuel.

Earning:   Approval pending.