Name of the College : P.E.S College of Engineering
University : Visvesvaraya Technological University
Department : Mechanical Engineering
Subject Code/Name : P08 CH – 12/Engineering Chemistry
Year : 2009
Degree : B.E
Sem : I
Website : pescemandya.org
Document Type : Model Question Paper
Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/pescemandya.org/4696-chemistry_question_paper.pdf
Engineering Chemistry Model Question Paper :
First semester B.E. Degree Examination – 2009
Time: 03 hrs (Model Questions paper)
Max Marks – 100
Related : P.E.S College of Engineering Engineering Physics B.E Model Question Paper : www.pdfquestion.in/4695.html
Note : Answer any FIVE questions. Selecting at least TWO questions from Part – A, Or from Part – B
PART – A :
1. a) What are Chemical fuels? Give the classification of fuels with examples. 6
b) Write short notes on i) octane number ii) cetane number and iii) power alcohol. Mention their applications. 7
c) Define HCV and LCV and calculate the HCV and LCV of coal sample using the following data
Weight of coal sample taken = 0.067 Kg
Weight of water taken = 1.234 Kg
Water equivalent of calorimeter = 0.65Kg
Raise in temperature = 3. 7 ºC
% of H2 in the sample = 5.5 %
Lalent heat of steam = 587 x 4.2 KJ / Kg
Specific heat of water = 4.2 KJ / Kg / ºC 7
2. a) Define standard electrode potential and explain the origin of single electrode potential. 6
b) Explain the construction and working principal of methanol oxygen fuel cell. Mention its applications. 7
c) An electro Chemical cell consists of iron electrode dipped in 0.02 M FeSO4 solution and copper electrode dipped in M/10 CuSO4 solution at 313 K. write the cell representation and electrode reactions. Calculate emf of cell, ?G & ?Gº. Given that (SOP) Fe 2+ / Fe = + 0.44 V and (SRP) Cu 2+ / Cu = + 0.34 V. R= 8.314 J/K/ mole, F = 96500 coulombs. 7
3. a) Describe the construction and working principal of Ni – MH battery and mention its applications. 6
b) Explain the production of solar grade silicon by crystal pulling technique method and purified by ozone refining. 7
c) Discuss the following characteristics of battery,
i) Voltage ii) Capacity iii) Energy efficiency iv) life cycle v) power density vi) Energy density vii) Shelf life 7
4. a) What is corrosion? Describe the mechanism of electro chemical corrosion by taking iron as an example. 6
b) How corrosion is prevented by proper selection and designing of materials. 7
c) Write a short note on Galvanisation and Tinning. Mention their applications. 7
PART – B :
5. a) Distinguish between thermo tropic and lyotropic liquid crystals with example. 6
b) What are the advantages of electro – less plating over electro plating? Discuss electro – less plating of copper on PCB. 7
c) Write short notes on decomposition potential and polarisation. 7
6. a) How the following polymers are manufactured? i) polyurethane and ii) bakelite and mention their engineering applications. 6
b) Discuss the following properties of cement,
i) Quality ii) Shrinkage iii) Soundness iv) setting time v) Heat of hydration
vi) Strength vii) Acid effect. 7
c) Explain the vulcanisation and compounding of rubber. 7
7. a) Describe the hot lime – soda process of softening of water with reactions. 6
b) What is desalination of water? And explain the desalination water by Reverse osmosis. 7
c) Discuss the various stages of purification of water for municipal supply. 7
8. a) What is air pollution? And Discuss sources, ill effects and controls of oxide of sulphur dioxide. 6
b) Define COD & BOD. Calculate the COD of the effluent sample when 25 cm3 of an effluent requires 7.7 cm3 of 0.01 M K2Cr2O7 for oxidation. And molecular mass of K2Cr2O7 = 294. 7
c) Write short notes on
i) Acid rain ii) Global warning and iii) Ozone depletion. 7
Syllabus :
Unit – I : Chemical Energy Sources and Phase rule
Chemical Energy : Introduction, Fuels-Definition, classification. Calorific value – definition, Gross and Net calorific values. Determination of calorific value of solid and liquid fuels by Bomb calorimeter and gaseous fuel using Buoy’s calorimeter, numerical problems. Cracking -fluidized bed catalytic cracking, Reformation of petrol. Knocking-mechanism, ill effects, prevention of knocking, anti-knocking agents, leaded and unleaded petrol, Octane and Cetane number.
Applications of phase rule to single component system-water system, two component system : lead-silver system and desilverisation of lead by Pattinson’s process. 10 hrs Self-study component: (i) Alternate fuels: synthetic petrol by Bergius method, Power alcohol and Bio- diesel. (ii) Single component system-phase diagram of sulphur system.
Unit – II : Electrochemistry and Battery Technology
Electrode potential-origin; Standard electrode potential, Derivation of Nernst equation, Numerical problems. Types of electrodes- Primary reference electrode-limitations and secondary reference electrode, Construction and working of Calomel and Ag/AgCl electrodes, Glass electrode- construction and working, determination of pH of solution using glass electrode.