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USN
First Semester B.E. Degree Examination,
Dec.201S/Jan.2016
Engineering Chemistry Time: 3 hrs.
Max. Marks: .80
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Note: Answer any }'IVE full questions, choosing one full question from each,tno,dule. Module-l a. b.
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Derive Nernst equation for single electrode potential. (05 Marks) What is electrolyte concentration cell? The emf of the cell CU/CUS04(OOOlM)11 CUS04(XM/CU is O.0595V at 25°C. Find the value ofX. (05 Marks) Explain the following battery characteristics: i) Cell potential ii) Capacity iii) Shelf life. (06 Marks)
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Describe the construction and working ofNi-MH battery. Mention its applications.
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What is fuel cell? Distinguish between conventional cell and fuel cell.
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OR Explain differential aeration corrosion with one example. (05 Marks) What is metal finishing? Mention the technological importance of metal finishing. (06 Marks) Define electro less plating. Distinguish between electroplating and electroless plating.
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Module-2 Define corrosion. Explain the electro-chemical theory of corrosion by taking iron as an (06 Marks) example. -~. Explain the following factors affecting corrosion. (05 Marks) i) Ratio of anodic to cathodic areas ii) Nature of corrosion product iii) Temperature. Describe electroplating of nickel using Watt's bath. Mention its applications. (05 Marks)
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OR . Define reference electrode. Discuss the construction and working of calomel electrode.
Module-3 Explain the determination of calorific value of a solid fuel using bomb calorimeter. (06 Marks)
What is reforming of petroleum? Give any three reactions involved in reforming. (05 Marks) What is photovoltaic cell? Explain the construction and working of photo voltaic cell. (05 Marks)
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a. b.
Module-4 Explain the types of polymerization with example. (04 Marks) What is glass transition temperature? Discuss any two factors affecting the glass transition temperature. (06 Marks) Explain the synthesis and applications of the following. i) Plexi glass . ii) Polycarbonate (06 Marks)
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0.75g of coal sample (carbon-90%), hydrogen-6% and ash 4%) was subjected to combustion in a bomb calorimeter. Mass of water taken in the calorimeter was 3500g and the water equivalent of the calorimeter was 750g. The rise in temperature was found to be 3.2°C. Calculate the gross and net calorific values of a sample (Specific heat of water = 4. 187kJ/Kg/oC ; Latent heat of steam = 2454kJ/Kg) (05 Marks) Explain the modules, panels and arrays of PY cells. (06 Marks) Explain the production of solar grade silicon by Union - Carbide process. (05 Marks)
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a. b. c.
-.. . Module-5 Explain the scale and sludge formation in boiler. Define COD. Discuss the experimental determination ofCGD of waste water. Write a note on fullerences.
a. b.
Explain desalination of sea water by ion selective electrodialysis process. (05 Marks) Explain the synthesis of nano materials by Sol-Gel process. Mention its advantages.
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(05 Marks) (06 Marks) (05 Marks)
OR
(06 Marks) (05 Marks)
Write a note on carbon nano tubes.
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In a polymer sample, 20% of molecules have molecular mass 15000g/mol, 45% molecules have molecular mass 25000g/mol remaining molecules have molecular mass 27000g/mol, calculate the number average, weight average molecular mass of the polymer. (06 Marks) Explain the synthesis, properties and applications of silicone rubber. (05 Marks) Explain the mechanism of conduction in polyaniline (05 Marks)
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(ii) Butyl rubber (6). 15.(a) What are chemical fuels? Give their classification with examples. (4). (b) Describe the analysis of coal by proximate analysis method.
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