Engineering Chemistry - May 2016

First Year Engineering (C Cycle) (Semester 1)

TOTAL MARKS: 100
TOTAL TIME: 3 HOURS (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) Define reference electrode. Explain the measurement of single electrode potential using calomel electrode . Derive Nernst's equation for single electrode potential .(5 marks) 1(b) What are the types of electrodes? Explain briefly with an example for each .(5 marks) 1(c) What are batteries? Explain the following battery characteristics; (i) Cell potential
(ii) Cycle life.(5 marks) 1(d) Describe the construction , working and application of Nickel-metal hyride battery .(5 marks) 10(a) Explain the reason for scale and sludge formation in water boilers. Mention its effects.(5 marks) 10(b) Define COD. If 20cm³ of waste water sample comsume 30cm³ of 0.01 N K₂Cr₂O₇ for oxidation of impurities, calculate COD value of water sample.(5 marks) 10(c) Explain Sol-gel method for preparation of nanomaterial with an example.(5 marks) 10(d) Give the structural feature, properties and applications of fullerene.(5 marks) 2(a) What are ion-selective electrodes? Expalin the determination of p^H of a solution using glass electrode.(5 marks) 2(b) What are concentration cells? Calculate the cell potential of the following cell at 298 K Ag/AgC1(0.01m)||AgC1(0.5m)/Ag(5 marks) 2(c) Describe the construction and working of methanol-oxygen fuel cell.(5 marks) 2(d) Explain the construction, working and application of Li-MnO₂ battery.(5 marks) 3(a) Define the term corrosion. Explain pitting corrosion and water line corrosion.(5 marks) 3(b) Explain the following factors affecting rate corrosion;
(i) Nature of metal
(ii) p^H
(iii) Corrosion product.(5 marks) 3(c) Explain decompostition potential and polarization with respect to electroplating.(5 marks) 3(d) Explain the process of electroplating of hard chromium. Give the reason for not using chromium as anode.(5 marks) 4((c) Explain how the following factor influence the rate of electro deposit;
(i) Current density
(ii) Throwing power .(5 marks) 4(a) What is galvanization ? Explain the process of galvanization.(5 marks) 4(b) What is cathodic protection ? Explain sacrificial anode and impressed current method .(5 marks) 4(d) What is electroless plating ? Explain the process of electroless plating of copper on PCB.(5 marks) 5(a) Exlplain the determination of calorific value of soild/liquid fuel using Bomb Calorimeter.(5 marks) 5(b) What is knocking ? Explain gasoline knocking mechanism with chemical reactions.(5 marks) 5(c) What is biodiesel? Give its synthesis .(5 marks) 5(d) Explain the construction and working of a PV-Cell(5 marks) 6(a) Define petroleum cracking. Explain fluidized catalytic cracking .(5 marks) 6(b) Define the following:
(i) Octane number
(ii) Power alcohol
(iii) Antiknocking agents
iv) Centane number
(v) Bio-gas.(5 marks) 6(c) Explain zone refining technique for purification of sillicon and difusion method.(5 marks) 6(d) Calculate the gross and net calorific value of a sample of coal from the following data;
Mass of coke = o.98g
Mass of water =2600g,
Water equivalent of calorimeter = 368g,
Specific heat of water = 4.187 J/g/K
Rise in tempreature = 2.8K
percentage of Hydrogen in the fuel sample = 5.8 Latent heat of steam = 2454 J/g(5 marks) 7(a) Explain addition and condensation polymerization with suitable example to each .(5 marks) 7(b) In a sample of polymer 20 percentage of molecules have molecular mas 15000 g/mol, 35 percentage molecules have molecular mass 25000 g/mol, 45 percentage molecules have molecular mass 20000 g/mol, calculate the number average and weight average molecular mass off a polymer .(5 marks) 7(c) Give the synthesis, properties and application of poly urethane.(5 marks) 7(d) What are polymer composites? Explain the synthesis and properties of carbon fiber .(5 marks) 8(a) Explain the free radial mechanism of addition polymerization of Vinyl chloride.(5 marks) 8(b) What are adhesives ? Explain the synthesis and properties of epoxy resin.(5 marks) 8(c) What is glass transition tempreature ? Explain any three factor affecting T_g.(5 marks) 8(d) What are conducting polymers? Explain the mechanism of conduction in polyaniline .(5 marks) 9(a) What is Boiler feed water? Explain the corrosion of water boilers due to dissilved oxygen, CO₂ and mg Cl₂.(5 marks) 9(b) Explain the Winkler's method of determining dissolved oxygen. Give the reactions invovled .(5 marks) 9(c) Discuss the gas condensation and hydrothermal process for the synthesis of nano materials.(5 marks) 9(d) Give the synthesis, properties and application of carbon-nano tubes.(5 marks)