VTU First Year Engineering (C Cycle) (Semester 1)
Engineering Chemistry
May 2015
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary


1 (a) Explain the construction and working of glass electrode
5 M
1 (a) Give the construction of Calomel electrode. Justify that it is a reversible electrode.
5 M
1 (c) Discuss the construction and working of Li-MnO2 battery.
5 M
1 (d) What are fuel cells? How is it different from galvanic cell? Mention any two advantages of fuel cell.
5 M

2 (a) Define reference electrode. Explain the measurement of standard electrode potential using Calomel electrode
5 M
2 (b) A cell is obtained by combining two Cd electrodes immersed in cadmium sulphate solutions of 0.1M and 0.5M at 25°C. Give the cell representation, cell reaction and calculate EMF of the cell.
5 M
2 (c) Describe the construction and working of Zinc - Air battery.
5 M
2 (d) Explain the construction and working of methanol - oxygen fuel cell. Mention any two applications.
5 M

3 (a) What is stress corrosion? Explain stress corrosion in boilers due to alkali with chemical reactions
5 M
3 (b) How does the following factor affect the rate of corrosion?
i) Nature of corrosion product. ii) Temperature ii) pH
5 M
3 (c) Explain the following factors influencing rate of electro-deposit. i) current density ii) metal ion concentration iii) throwing power
5 M
3 (d) Explain the process of electroplating of chromium for engineering applications. Indicate the reasons for not employing chromium as anode.
5 M

4 (a) What is cathodic protection? Explain sacrificial anodic method and impressed current method-
5 M
4 (b) Explain the electro chemical theory of corrosion by taking iron as an example
5 M
4 (c) Write a short note on
i) polarisation ii) Decomposition potential
5 M
4 (d) Explain the process of electroless plating of copper on PCB
5 M

5 (a) On burning 1.15 g of a coal sample in a bomb calorimeter, the temperature of 3.5kg of water in the calorimeter increased from 265°C to 285°C. Water equivalent of calorimeter is 325g. Specific heat of water 4.187kJ/kg/° C . Latent heat of steam = 587 Cal/g. If the fuel contains 4% hydrogen. calculate gross and net calorific values.
5 M
5 (b) Explain synthesis of petrol by Fischer Tropsch Process
5 M
5 (c) Discuss the construction and working of a photovoltaic cell
5 M
5 (d) Explain the production of solar grade silicon by Union- Carbide process
5 M

6 (a) Define octane number. Explain reformation of petrol with equations
5 M
6 (b) What is biodiesel? How is it prepared? What are the advantages?
5 M
6 (c) What is doping? Explain doping of Si by diffusion Technique
5 M
6 (d) Explain the designing of PV cells-Module, panel and Array
5 M

7 (a) Explain the free radical mechanism of polymerisation taking vinyl Chloride as a monomer.
6 M
7 (b) Differentiate addition and condensation polymerisation
4 M
7 (c) Give the synthesis reaction of Teflon and polymerisation
4 M
7 (d) Discuss the synthesis, properties and applications of epoxy resin
6 M

8 (a) Explain the following structure property relationships of polymers.
i) Crystalinity ii) Elasticity iii) Plastic deformation.
6 M
8 (b) Explain the following factors influencing the Tg.
i) Flexibility ii) Branching and cross linking
4 M
8 (c) Explain the synthesis of carbon fibre
4 M
8 (d) What is conducting polymer? Explain the mechanism of conduction in polyaniline and give the applications
6 M

9 (a) What is boiler feed water? Explain the priming and foaming in boilers.
5 M
9 (b) Define COD. Discuss the Experimental determination of COD of waste water
5 M
9 (c) What is nano material? Discuss the synthesis of nano material by gas condensation and precipitation methods
5 M
9 (d) Write a note on carbon nano tubes
5 M

10 (a) Explain the activated sludge treatment of sewage water.
5 M
10 (b) Discuss the Desalination of sea water by reverse osmosis
5 M
10 (c) Explain the synthesis of nanomaterials by hydro thermal process
5 M
10 (d) Write a note on Dendrimers.
5 M



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