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

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Code: 15A51101

Time: 3 hours

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B.Tech I Year I Semester (R15) Supplementary Examinations June 2017

ENGINEERING CHEMISTRY

(Common to ECE, ME, EIE & IT)

R15

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Max. Marks: 70

PART - A

(Compulsory Question)

Answer the following: (10 X 02 = 20 Marks)

1. (a) Write the chemical reaction (s) involved in softening of water using lime-soda method.

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2. (b) Write the reaction of bleaching powder with water and state its importance.
3. (c) Briefly differentiate between thermoset and thermoplastic polymers.
4. (d) Give one example of Ziegler-Natta catalyst used in polymer preparation.
5. (e) Define the wet method of corrosion.
6. (f) Draw a H2-O2 fuel cell and write the electro chemical reactions involved in it.

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7. (g) Write the composition of: (i) Producer – gas. (ii) Water – gas.
8. (h) Define octane number and cetane number.
9. (i) Define RUL of refractories.
10. (j) Briefly classify lubricants giving one example for each.

PART - B

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

UNIT - I

Explain why and how water is sterilized. What do yo understand by residual chlorine and break-point chlorination?

OR

Describe one membrane method of water purification used for domestic purpose now-a-days.

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UNIT-II

What is polyurethane? Why these are called versatile engineering materials?

OR

What are silicones? How is silicone elastomer different from natural rubber?

UNIT - III

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What are rechargeable batteries? Explain the working of Li-ion battery.

OR

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

What is the importance of proximate method of analysis of coal? Explain in detail.

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OR

Classify fuels in detail giving example for each. Differentiate between solid, liquid and gaseous fuels.

UNIT - V

Describe the wet method of cement manufacture. What are its advantages / disadvantages over the dry method of cement manufacture?

OR

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What are fullerenes? Mention their important characteristics and useful applications.

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