Jawaharlal Nehru Technological University Hyderabad 2003 B.Tech Production Engineering I Supplementary s, ember- ENGINEERING CHEMISTRY - Question 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) Explain the galvanic corrosion of the metals with relevant chemical reactions and the role of emf series in determining the corrosion to metals.
b) Write a brief note on:
(i) Tinning (ii) Lacquers.

2.a) What are plastics? Differentiate thermoplastic resins from thermoset resins.
b) Give a detailed account on preparation properties and uses of the following:
(i) Thiokol (ii) Nylon.

3.a) Explain the ion-exchange process for the treatment of boiler-feed water.
b) Calculate the temporary and permanent hardness of water in ppm, degree dark and degree French (oFr) of a sample of water containing the subsequent dissolved salts.
CaCO3 = 100 mg/l, Mg(HCO3)2 = 14.6 mg/l, Hcl = 36 mg/l, MgSO4 = 12 mg/l,
NaCl = 84 mg/l, CaCl2 = 11.1 mg/l.

4.a) What is carbonization process? discuss the characteristics of a good metallurgical coke.
b) Explain the catalytic cracking of petroleum and its advantages.

5.a) Why refractory materials are used in linin the furnaces? discuss the reasons for the failure of a refractor Material.
b) What are insulators? How are they classified? provide an account of the characteristics of a good thermal insulating material.

6.a) Explain the classification and theories of lubrication.
b) How do you analyse the CaO and Fe3+ in the provided cement sample.

7.a) Explain the analysis of fuel gas by Orsat apparatus.
b) Calculate the quantity of air needed and % composition by weight of the products of combustion of a sample of coal containing the subsequent composition.
C = 88%, H2 = 10% and O2 = 2%.

8. Write short notes on the following:
a) Polyethylene
b) Boiler corrosion
c) Cathodic protection
d) Flash and fire point.

Earning:   Approval pending.