Download JNTUA B.Tech 1-1 R15 2019 Dec Supply 15A51101 Engineering Chemistry Question Paper

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Code: 15A51101

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B.Tech I Year I Semester (R15) Supplementary Examinations November/December 2019

ENGINEERING CHEMISTRY

(Common to ECE, ME, EIE & IT)

Time: 3 hours

Max. Marks: 70

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PART - A

(Compulsory Question)

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

1. (a) What is meant by hardness of water? What are its units?
2. (b) What is meant by sterilization of water?

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3. (c) What is meant by degree of polymerization?
4. (d) What is meant by vulcanization?
5. (e) What is meant by galvanic cell?
6. (f) What is meant by corrosion?
7. (g) What are four important characteristics of metallurgical coke?

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8. (h) Define cetane number.
9. (i) What is meant by refractory? Give two examples.
10. (j) Define flash and fire points.

PART - B

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

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UNIT - I

1. (a) Describe the estimation of dissolved oxygen by Winkler's method.
2. (b) Define scale and sludge. How it will be overcome?

OR

1. (a) Describe the desalination of Brackish water by electrodialysis.

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2. (b) A sample of water on analysis gives the following :
   MgCl2 =9.5 ppm; CaSO4 = 3.4 ppm; Mg(HCO3)2 = 7.3 ppm; MgSO4= 6.00 ppm. Calculate temporary and permanent hardness of the sample.

UNIT - II

1. (a) Write preparation, properties and applications of Teflon.
2. (b) What is meant by thermosetting resins? Write short notes on processing of natural rubber.

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OR

1. (a) What is meant by resins? Write preparation, properties and applications of Bakelite.
2. (b) What are conducting polymers? Describe preparation and applications of polyacetylene.

UNIT - III

1. (a) Explain theory of wet corrosion.

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2. (b) What are secondary cells? Describe the construction of Ni-Cd cell? Write cell reactions and its applications

OR

1. (a) Distinguish between wet and dry corrosion.
2. (b) Write short notes on fuel cells by taking suitable example.

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UNIT - IV

1. (a) Define calorific value of a fuel. Distinguish gross and net calorific value.
2. (b) How do you synthesis petrol by Fischer-Tropsch process?

OR

1. (a) Describe the proximate analysis of coal.

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2. (b) How flue gas analysis is conducted by Orsat's apparatus?

UNIT - V

1. (a) What is pyrometric cone equivalent test? How it is determined for a refractory
2. (b) Define lubricant? Discuss the important functions of lubricants

OR

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1. (a) Write short notes on carbon nano tubes.
2. (b) Describe thick film lubrication

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