Engineering Chemistry -Engineering-VTU-January- 2018(CBCS)
Visvesvaraya Technological University
B.E. First Semester All Branches (C.B.C.S.)
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) What are reference electrodes? Describe the construction and working of Calomel electrode mention the use. [7M]
b)Define battery. Explain the construction, working, and uses of Ni-metal Hydride battery. [7M]
c)What are fuel cells? Explain the construction and working of methanol oxygen fuel cell. [6M]
Q2.a)Define single electrode potential? Derive Nernst equation for the single electrode. [7M]
b)What are concentration cells? The cell potential of Ag concentration cell,\frac{Ag_{(s)}}{AgNO_3}(0.001M)(AgNO_3(XM)/Ag_{(s)}\; is 0.0659V at 250C .Write the cell reactions and calculate the value of X . [7M]
c)Write a note on i)Capacity ii)Cycle life iii)Voltage [6M]
Q3.a)Define corrosion .Explain the electrothermal theory of corrosion by taking iron as an example. [7M]
b)What is anodizing? Explain anodizing of aluminium,metion use. [7M]
c)Define electroless plating. What are the difference between electroplating and electroless plating? [6M]
OR
Q4.a)What is differential aeration corrosion? Explain pitting corrosion with anode and cathode reactions. [7M]
b)Define metal finishing? Explain electroplating of Nickel by Watt’s bath, mention the uses. [7M]
c)What is cathodic protection? Explain the sacrificial anode method and impressed current method. [6M]
Q5.a)Define GCV and NCV? How the calorific value of a solid/liquid fuel is determined using Bomb Calorimeter. [7M]
b)Define octane and cetane number? What is the objective of reforming of petrol and discuss the various methods of reforming? [5M]
c)What are solar cells? Describe the method of purification of silicon by zone refining. [6M]
Q6.a)A coal sample containing 92% C,7% H2, and 3% ash is subjected to combustion in a bomb calorimeter .Calculate the Gross and net calorific values. Given that mass of coal, sample is 0.85×10-3 Kg, mass of water in copper calorimeter is 2 Kg, water Equivalent of calorimeter is 0.75kg, rise in temperature of water is 2.50C ,latent heat of steam is 2454kJ/kg and specific heat of water is 4.187 kJ/kg/0C. [7M]
b)Describe the production of solar-grade Si by the union carbide process. [6M]
c)Explain the construction and working of a PV cell. [6M]
Q7.a)What are polymers? Illustrate the mechanism of addition polymerization by taking vinyl chloride as an example. [7M]
b)Describe the manufacture of i)PMMA ii)Kevlar Mention the use. [7M]
c)Define addition and condensation polymerization process with one example each. [6M]
Q8.a)Define glass transition temperature. Explain any three factors affecting Tg. [7M]
b)What are elastomers? Give the synthesis and application of i)Silicon rubber ii)Epoxy resin. [7M]
c)A polymer sample containing 50,100 and 150 molecules having molar mass 2000 g/mol 2500 g/ml and 3000 g/mol respectively. Calculate the number average and weight average molecular mass of the polymer. [6M]
Q9.a)What is boiler feedwater ? Explain the difference between scale and sludge formation in the boiler. [7M]
b)What is desalination? Explain desalination of seawater by electrodialysis. [7M]
c)What are nanomaterials? Explain the synthesis of nanomaterial by sol-gel method. [6M]
Q10.a)Define COD and BOD. In the COD test 25.5cm3 and 12.5cm3 of N FAS solution are required for blank and sample titration respectively. The volume of the test sample used is 26cm3. Calculate the COD of the sample solution. [8M]
b)Describe the synthesis of nanomaterials by chemical vapor condensation process. [6M]
c)Write note on CNT and dendrimers. [5M]