Engineering Chemistry -Engineering-VTU-July- 2019(CBCS)
Visvesvaraya Technological University
B.E. First Semester All Branches (C.B.C.S.)
Engineering Chemistry
TIME: 3HOURS MAXIMUM MARKS-100
Note-Answer FIVE full questions, choosing one full question from each module.
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Q1.a)What is single electrode potential? Derive the equation for single electrode potential. [6M]
b)What are batteries? Demonstrate the construction and working of Ni-MH battery, mention its applications. [7M]
c)What voltage will be generated by a cell that consists of an iron electrode immersed in 0.5 M FeSO4 solution and copper electrode immersed in 1 M CuSo4 solution at 298K. Given E0Fe=-0.44V and E0Cu=0.34 V.Write the cell representation and cell reactions. [7M]
OR
Q2.a)What is battery? Explain primary and secondary with example. [6M]
b)Describe the working of Li-ion battery. Mention its applications. [7M]
c)what are concentration cells? Emf of the cell Cd|CdSO4(XM)||CdSO4(0.025M)|Cd at 280C is 0.035V.Find the concentration of CdSO4 at the anode. Given R=8.314 J/K/mole , F=96500C.
Q3.a)Discuss the following types of corrosion: [6M]
i)Differential metallic corrosion
ii)Waterline corrosion.
b)What is corrosion? Illustrate electrochemical theory of corrosion taking iron as an example. [7M]
c)What is electroless plating? Outline the electroless plating of copper. [7M]
OR
Q4.a)Explain the factors affecting the rate of corrosion: [6M]
i)Nature of corrosion product
ii)Ratio of anodic to cathodic areas.
b)What is meant by metal finishing? Highlight any five technological importance of metal finishing. [7M]
c)What is electroplating? Discuss the electroplating of chromium [7M]
Q5.a)What are fuel cells? Describe the construction and working of the methanol-oxygen fuel cell. [6M]
b)Describe the experimental determination of the calorific value of solid fuel using bomb calorimeter. [7M]
c)0.95 g of coal sample (C=93%,H2=6% and ash 1%) was subjected to combustion in Bomb Calorimeter.Mass of water taken in the calorimeter was 2.6Kg and the water equivalent of the calorimeter was 0.75kg. The rise in temperature was found to be 3.20C. Calculate the gross and net calorific values of the sample Latent heat of steam=2457kJ/kg/0C and S=4.187 kJ/kg/0C. [7M]
OR
Q6a)Explain the preparation of solar grade silicon by the union-carbide process. [6M]
b)What are PV-cells ? Illustrate the construction and working of a typical PV-cell [7M]
c)What is knocking? Explain the mechanisms of knocking. Mention its ill effects. [7M]
Q7a)Outline the softening of water by the ion-exchange method. [6M]
b)What are the sources, effects and control of lead pollution? [7M]
c)Define COD. In a COD test,30.6cm3 and 15.5cm3 of 0.05N FAS solution are required for blank and sample titration respectively. The volume of the test sample used was 25cm3. Solve the COD of the water sample solution. [7M]
OR
Q8.a)What is desalination? Describe the process of reverse osmosis of water. [6M]
b)What is boiler corrosion? Explain the boiler corrosion with CO2, O2, and MgCl2. [7M]
c)Define COD. Illustrate the determination of COD of waste water sample. [7M]
Q9.a)Describe the synthesis of nano-material by sol-gel technique. [6M]
b)Discuss the theory and instrumentation of conductometry.[7M]
c)Outline the theory, instrumentation and applications of Calorimetry. [7M]
OR
Q10a)Explain size-dependent properties of nanomaterial : [6M]
i)Surface area
ii)Electrical
iii)Optical properties.
b)Write a note on fullerenes. Mention its properties and applications. [7M]
c)What are nanomaterials? Explain the synthesis of nanomaterial by a chemical vapour deposition method. [7M]