www.pescemandya.org P.E.S. College of Engineering : Engineering Chemistry Model Question Paper

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P.E.S. College of Engineering
Engineering Chemistry
Sub Code: P08 CH – 12
First semester B.E. Degree Examination – 2009
Time: 03 hrs (Model Questions paper) Max Marks – 100

Note: Answer any FIVE questions. Selecting at least TWO questions from Part – A,Or from Part – B

Model Question List : http://www.pescemandya.org/pes_ug.php
Model Question Paper : http://www.pescemandya.org/pdf/che/c...tion_paper.pdf

PART – A
1. a) What are Chemical fuels? Give the classification of fuels with examples. 6
b) Write short notes on i) octane number ii) cetane number and iii) power alcohol. Mention their applications. 7
c) Define HCV and LCV and calculate the HCV and LCV of coal sample using the following data
Weight of coal sample taken = 0.067 Kg
Weight of water taken = 1.234 Kg
Water equivalent of calorimeter = 0.65Kg
Raise in temperature = 3. 7 ºC
% of H2 in the sample = 5.5 %
Lalent heat of steam = 587 x 4.2 KJ / Kg
Specific heat of water = 4.2 KJ / Kg / ºC 7

2. a) Define standard electrode potential and explain the origin of single electrode potential. 6
b) Explain the construction and working principal of methanol oxygen fuel cell. Mention its applications. 7
c) An electro Chemical cell consists of iron electrode dipped in 0.02 M FeSO4 solution and copper electrode dipped in M/10 CuSO4 solution at 313 K. write the cell representation and electrode reactions. Calculate emf of cell, ?G & ?Gº. Given that (SOP) Fe 2+ / Fe = + 0.44 V and (SRP) Cu 2+ / Cu = + 0.34 V. R= 8.314 J/K/ mole, F = 96500 coulombs. 7

3. a) Describe the construction and working principal of Ni – MH battery and mention its applications. 6
b) Explain the production of solar grade silicon by crystal pulling technique method and purified by ozone refining. 7
c) Discuss the following characteristics of battery,
i) Voltage ii) Capacity iii) Energy efficiency iv) life cycle v) power density vi) Energy density vii) Shelf life 7

4. a) What is corrosion? Describe the mechanism of electro chemical corrosion by taking iron as an example. 6
b) How corrosion is prevented by proper selection and designing of materials. 7
c) Write a short note on Galvanisation and Tinning. Mention their applications. 7

PART – B
5. a) Distinguish between thermo tropic and lyotropic liquid crystals with example. 6
b) What are the advantages of electro – less plating over electro plating? Discuss electro – less plating of copper on PCB. 7
c) Write short notes on decomposition potential and polarisation. 7

6. a) How the following polymers are manufactured? i) polyurethane and ii) bakelite and mention their engineering applications. 6
b) Discuss the following properties of cement,
i) Quality ii) Shrinkage iii) Soundness iv) setting time v) Heat of hydration vi) Strength vii) Acid effect. 7
c) Explain the vulcanisation and compounding of rubber. 7

7. a) Describe the hot lime – soda process of softening of water with reactions. 6
b) What is desalination of water? And explain the desalination water by Reverse osmosis. 7
c) Discuss the various stages of purification of water for municipal supply. 7

8. a) What is air pollution? And Discuss sources, ill effects and controls of oxide of sulphur dioxide. 6
b) Define COD & BOD. Calculate the COD of the effluent sample when 25 cm3 of an effluent requires 7.7 cm3 of 0.01 M K2Cr2O7 for oxidation. And molecular mass of K2Cr2O7 = 294. 7
c) Write short notes on
i) Acid rain ii) Global warning and iii) Ozone depletion. 7