Question Paper: Engineering Chemistry : Question Paper Dec 2014 - First Year Engineering (C Cycle) (Semester 1) | Visveswaraya Technological University (VTU)

Engineering Chemistry - Dec 2014

First Year Engineering (C Cycle) (Semester 1)

(1) Answer any FIVE full questions, choosing at least two from each part.
(2) Answer all objective type questions only on OMR sheet page 5 of the answer booklet.
(3) Answer to objective type questions on sheets other than OMR will not be valued.
1 (a) Derive Nernst's equation for single electrode potential.(5 marks) 1 (b) Describe the construction and working of calomel eletrode.(5 marks) 1 (c) What are batteries? Explain the following battery characteristics:
i) Capacity ii) Cycle life
(5 marks)
1 (d) Describe the construction and working of nickel metal hydride battery.(5 marks) 10 (a) Define COD, calculate the COD of the effluent sample when 25 cm3 of the effluent sample requires 8.5 cm2 of 0.001 NK2Cr2O2 solution for complete oxidation.(5 marks) 10 (b) Discuss in detail the softening of water by ion-exchange process.(5 marks) 10 (c) Explain the synthesis of nanomaterials by hydro thermal process.(5 marks) 10 (d) What are Fullereces? Explain the synthesis and uses of fullerenes.(5 marks) 2 (a) What are Reference electrode? Explain the determination of electrode potential of an unknown electrode using calomel electrode.(5 marks) 2 (b) What are concentration cells? The emf of the cell Ag |AgN(), (0.0083M)| AgNO3(x M) Ag was found to be 0.074V at 298 K. Calculate the value of x and write cell reaction.(5 marks) 2 (c) Define fuel cell. Explain the construction and working of methanol oxygen fuel cell.(5 marks) 2 (d) Explain the construction and working of lithium ion battery.(5 marks) 3 (a) Explain the electrochemical theory of corrosion by taking iron as an example.(5 marks) 3 (b) What is Corrosion? Explain the following factors affecting the rate of corrosion:
i) Nature of corrosion product
ii) Anodic and Cathodic areas.
(5 marks)
3 (c) What is Electro less platting? Write the difference between electroplating and electroless platting.(5 marks) 3 (d) Discuss the electroplatting of gold using Acidic Cyanide bath.(5 marks) 4 (a) What is Anodising? Explain the anodizing of aluminium.(5 marks) 4 (b) What is Cathodic protection? Explain sacrificial anodic method and impressed current method.(5 marks) 4 (c) Explain the effect of any two factors on the nature of electro deposite.(5 marks) 4 (d) Explain the process of electroless platting of copper with relevant reactions.(5 marks) 5 (a) What is Cracking? Explain the fluidized catalytic cracking process.(5 marks) 5 (b) On burning 0.76 × 10-3 kg of a solid fuel in a bomb calorimeter, the temperature and latent heat of steam are 0.486kg and 2457 kJ/kg respectively. Calculate its GCV and NCV. Give Sp Heat=4.187 kJ/kg/ °C and % H2 is 2.5.(5 marks) 5 (c) Discuss the production of solar grade silicon by Union-Carbide process.(5 marks) 5 (d) What are the advantages and disadvantages of PV cells?(5 marks) 6 (a) Explain the determination of calorific value of a solid fuel using bomb calorimeter.(5 marks) 6 (b) Define the following terms:
i) Chemical fuel
ii) Calorific value
iii) Biodiesel
iv) Octane number
v) Reforming of petrol.
(5 marks)
6 (c) Discuss the construction and working of a PV-cell.(5 marks) 6 (d) What is doping? Discuss the purification of silicon of zone-reining.(5 marks) 7 (a) Explain the free radical mechanism of addition polymerization by taking Vinyl chloride as a monomer.(5 marks) 7 (b) What are adhesives? Explain the synthesis and applications of epoxy resin.(5 marks) 7 (c) Write the synthesis and applications of the following polymers:
i) Polymethyl methacrylate ii) Teflon
(5 marks)
7 (d) What are polymer composites? Explain the preparation and uses of Kevlar fiber.(5 marks) 8 (a) Calculate the number average and weight average molecular mass of a polymer with the following composition: $$ \begin{bmatrix} &\alpha \\ -CH_2&-CH \end{bmatrix}_{200} \ is \ 40\%; \\\begin{bmatrix} &\alpha \\-CH_2 &CH- \end{bmatrix}_{400} \ is \ 30\%; \\\begin{bmatrix} &\alpha \\-CH_2 &-CH - \end{bmatrix}_{500} \ is \ 30\% . $$ Given At. Wt. of C-12, Atomic weight of H=1; and Atomic weight of CL=35.5(5 marks) 8 (b) What is glass transition temperature? How is it affected by
i) Intermolecular forces
ii) Flexibility
(5 marks)
8 (c) What is Conducting polymer? Explain the mechanism of conduction in polyaniline.(5 marks) 8 (d) Give the synthesis and uses of the following polymers:
i) Silicon rubber
ii) Polycarbonates.
(5 marks)
9 (a) What is boiler feed water? Explain the scale and sludge formation in boiler. Mention their ill effects.(5 marks) 9 (b) What is desalination? Explain the desalination of saline water by electro dialysis.(5 marks) 9 (c) What are nano materials? Explain the synthesis of nano material by Sol gel method.(5 marks) 9 (d) Write a note on carbon nano tubes.(5 marks)

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