Engineering Chemistry -Engineering-VTU-July- 2016

Visvesvaraya Technological University

B.E. First Semester All Branches 

Engineering Chemistry

TIME: 3HOURS                                                                                                                                                    MAXIMUM MARKS-80

Note-Answer FIVE full questions, choosing one full question from each module.

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Q1.a) Derive Nernst equation for single electrode potential.    [5M]

b)What is electrolyte concentration cell? The emf of the cell Cu|CuSo4(0.001M)||CuSo4(XM)|Cu is 0.0595 V at 250C.Find the value of X .   [5M]

c)Explain the following battery characteristics: [6M]

i)Cell potential

ii)Capacity

iii)Shelf life

 

Q2.a)Define reference electrode. Discuss the construction and working of the calomel electrode.    [5M]

b)Describe the construction and working of the Ni-MH battery. Mention its applications. [5M]

c)What is fuel cell? Distinguish between conventional cell and fuel cell. [6M]

 

Q3.a)Define corrosion.Explain the electrochemical theory of corrosion by taking iron as an example. [6M] 

b)Explain the following factor affecting corrosion.  [5M]

i)Ratio of anodic to cathodic areas

ii)Nature of corrosion product.

ii)Temperature.

c)Describe electroplating of nickel using Watt’s bath. Mention its applications.  [5M]

 

OR

 

Q4.a)Explain differential aeration corrosion with one example.   [5M]

b)What is metal finishing? Mention the technological importance of Metal Finishing. [6M]

c)Define electroless platting. Distinguish between electroplating and electroless platting.   [5M]

 

Q5.a)Explain the determination of calorific value of a solid fuel using bomb calorimeter. [6M]

b)What is reforming of petroleum? Give any three reactions involved in reforming.   [5M]

c)What is photovoltic cell?Explain the construction and working of a photovoltaic cell.  [5M]

OR

Q6.a)0.75 g of coal sample (carbon -90%, hydrogen -6%, and ash 4% ) was subjected to combustion in a bomb calorimeter. The 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 3.20C. Calculate the gross and net calorific values of a sample (Specific heat of water=4.187 kl / kg / oC; Latent heat of steam =2454 kJ/kg.)  [5M]

b)Explain the modules, panels, and arrays of PV cells.     [6M]

c)Explain the production of solar grade silicon by the Union-Carbide process. [5M]

Q7.a)Explain the type of polymerization with example.  [4M]

b)What is glass transition temperature? Discuss any two factors affecting the glass transition temperature. [6M]

c)Explain the synthesis and applications of the following: [6M]

i) Plexi glass

ii)Polycarbonate

OR 

Q8.a) In a polymer sample, 20% of molecules have a molecular mass of 15000g/mol. 45% of molecules have a molecular mass of 25000g/mol remaining molecules have a molecular mass of 27000 g/mol. Calculate the number average weight average molecular mass of the polymer.  [6M]

b)Explain the synthesis, properties, and applications of silicone rubber.  [5M]

c)Explain the mechanism of conduction in polyaniline.  [5M]

 

Q9.a)Explain the scale and sludge formation in the boiler. [5M]

b)Define COD. Discuss of experiment determination COD of waste water. [6M]

c)Write a note on fullerences. [5M]

 

Q10.a) Explain desalination of sea water by ion-selective electrodialysis process.  [5M]

b)Explain the synthesis of two materials of Sol-Gel process. Mention its advantages. [6M]

c)Write a note on carbon nano tubes. [5M]

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