Download JNTUA B.Tech 1-1 R15 2017 June 15A51101 Engineering Chemistry Question Paper

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Code: 15A51101

B.Tech I Year I Semester (R15) Supplementary Examinations June 2017
ENGINEERING CHEMISTRY
(Common to ECE, ME, EIE & IT)

Time: 3 hours Max. Marks: 70

PART - A
(Compulsory Question)

*****
1 Answer the following: (10 X 02 = 20 Marks)
(a) Write the chemical reaction (s) involved in softening of water using lime-soda method.
(b) Write the reaction of bleaching powder with water and state its importance.
(c) Briefly differentiate between thermoset and thermoplastic polymers.
(d) Give one example of Ziegler-Natta catalyst used in polymer preparation.
(e) Define the wet method of corrosion.
(f) Draw a H
2
-O
2
fuel cell and write the electro chemical reactions involved in it.
(g) Write the composition of: (i) Producer ? gas. (ii) Water ? gas.
(h) Define octane number and cetane number.
(i) Define RUL of refractories.
(j) Briefly classify lubricants giving one example for each.

PART - B
(Answer all five units, 5 X 10 = 50 Marks)

UNIT - I

2 Explain why and how water is sterilized. What do you understand by residual chlorine and break-point
chlorination?
OR
3 Describe one membrane method of water purification used for domestic purpose now-a-days.

UNIT - II

4 What is polyurethane? Why these polymers are called versatile engineering materials?
OR
5 What are silicones? How is silicone elastomer different from natural rubber?

UNIT - III

6 What are rechargeable batteries? Explain the working of Li-ion battery.
OR
7 Using a neat diagram, explain the working of a Daniel-cell. Do you use a salt ? bridge in this cell? If yes,
explain why?

UNIT - IV

8 What is the importance of proximate method of analysis of coal? Explain in detail.
OR
9 Classify fuels in detail giving example for each. Differentiate between solid, liquid and gaseous fuels.

UNIT - V

10 Describe the wet method of cement manufacture. What are its advantages / disadvantages over the dry
method of cement manufacture?
OR
11 What are fullerenes? Mention their important characteristics and useful applications.
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R15
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