Question Paper: Engineering Chemistry : Question Paper May 2016 - First Year Engineering (C Cycle) (Semester 1) | Visveswaraya Technological University (VTU)
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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.


Choose correct answers for the following;

1(a)(i) The Emf of an electrochemical cell with a spontaneous reaction is,
A) positive
B) Negative
C) Zero
D) 1.2 V
(1 marks)
1(a)(ii) The internal reference electrode used in glass electrode is,
A) Platinum
B) Ag-C1 electrode
C) Calomel electrode
D) Hydrogen electrode
(1 marks)
1(a)(iii) The potential developed at the interface between electrode and the solution is due to the formation of,
A) Double layer
B) Electrial double layer
C) Salt bridge
D) All of these
(1 marks)
1(a)(iv) SHE is used as a reference electrode for the potential measurements beacause whose electrode potential is,
A) Positive
B) Negative
C) Zero
D) All of these
(1 marks)
1(b) Define standard electrode potential . Derive Nemst equation for electrode potential.(5 marks) 1(c) What are concentration cells? Give an example . Derive an expression for the Emf of cell.(5 marks) 1(d) Mention any four advantages of calomel electrode. An electrochemical cell consists of an Nikel electrode dipped in 0.05 M NiSO4 and lead electrode dipped in 0.5 M pbSO4 solution. Write the cell scheme, cell reaction and calculate the Emf of the cell at 298 K. Given that the standard electrode potential of Ni and pb electrodes are -0.24V and -o.13 V respectively.(6 marks)


Choose correct answers for the following;

2(a)(i) Super capacitor stores,
A) Electrial energy
B) Chemical energy
C) Heat energy
D) None of these
(1 marks)
2(a)(ii) The fuel cells are superior than the batteries as,
A) They are eco friendly
B) They are light in weight
C) Produce current at low cost
D) All the above
(1 marks)
2(a)(iii) Example for reserve battery is,
A) Ni-MH
B) Zn-Air
C) Li-MnO2
D) Zn-Ag2O
(1 marks)
2(a)(iv) In which of the following battery, the cell reaction in irreversible?
A) Lead-acid
B) Zn-MnO2
C) Ni-MH
D) None of these
(1 marks)
2(b) What are batteries? How batteries are classified?(4 marks) 2(c) Describe the construction and working of lead acid battery. Mention any two applications of Li-MnO2 battery.(6 marks) 2(d) Ecplain the following battery characteristics; i) Cycle life
ii) Capacity
iii) Energy efficiency.
(6 marks)


Choose correct answers for the following;

3(a)(i) Caustic embrittlement is an example of ,
A) Stress corrosion
B) Waterline corrosion
C) Differential metal corrosion
D) Differential aereation corrosion
(1 marks)
3(a)(ii) The process of increasing the thickness of oxide layer on non ferrous metals by electrolytic oxidation is called ,
A) Phospating
B) Anodizing
C) Galvanising
D) None of these
(1 marks)
3(a)(iii) Galvanising is an example of,
A) Catodic metal coating
B) Anodic metal coating
C) Anodizing
D) Phosphating
(1 marks)
3(a)(iv) The corrosion inhibitor used to prevent corrosion on metal structure is,
A) Chromates
B) Carbonates
C) Bicarbonates
D) All of these
(1 marks)
3(b) Explain the electrochemical theory of corrosion with reference to iron .(5 marks) 3(c) Explain the influence of following factor on the rate of corrosion ;
(i) Nature of corrosion product.
(ii) pH and
(ii) Tempreature
(6 marks)
3(d) What is cathodic protection ? Explain sacrificial anode method.(5 marks) 4((c) Define the following terms; (i)Polarization
(ii) Decomposition potential and (iii) Over voltage
(6 marks)


Choose correct answers for the following;

4(a)(i) The ability of the plating bath to develop uniform coating on the entire surface of object is measured by its,
A) Current density
B) Plating power
C) Throwing power
D) None of these
(1 marks)
4(a)(ii) Reducing agent used in electroless nickel plating is
A) Sodium hypophosphite
B) Sodium Succinate
C) HCHO
D) CH3COONa
(1 marks)
4(a)(iii) In electroplating the article to be plated is subjected to pickling , this is to,
A) Remove grease
B) Increase rate of plating
C) Get a bright deposit
D) Remove oxide scale.
(1 marks)
4(a)(iv) Printed circuit boards are prepared by the process of,
A) Electroplating
B) Electroless plating
C) Throwing power
D) None of these
(1 marks)
4(b) Explain the effect of the following plating varibles on the nature of electro deposit.
(i) pH of the electrolytic bath
(ii) Tempreature
(4 marks)
4(d) What is electroless plating ? Give any two difference between electroplating and electroless palting . Explain the process of electroplating of chromium.(6 marks)


Choose correct answers for the following;

5(a)(i) Catalyst used in fluidized catalytic craking is, A) Platinum
B) Cr2O3
C) Al2O3
D) Al2O3+SiO2
(1 marks)
5(a)(ii) Biodiesel is produced by,
A) Distillation
B) Degradation
C) Esterification
D) Trans esterifiaction
(1 marks)
5(a)(iii) A reference mixture used to find the cetane number of petrol is,
A) n-heptane & iso octane
B) n-heptane and pentane
C)╬▒methyl naphthalene+Hexadecane
D) None of these
(1 marks)
5(a)(iv) Photovoltaic cell converts,
A) Solar energy into electriacl
B) Chemical energy into electrical energy
C) Electrical energy into chemical energy
D) All of these
(1 marks)
5(b) What are chemical fuels? How chemical fuels are classified ?(4 marks) 5(c) Explain how calorific value of solid fuel is determined by bomb calorimeter.(5 marks) 5(d) Define the term petroleum cracking. Explain any three reactions invovled in reformation of petrol.(7 marks)


Choose correct answers for the following;

6(a)(i) In potentiometric analysis, platinum electrode is used as,
A) Indicator electrode
B) Reference electrode
C) Ion selective electrode
D) All of these
(1 marks)
6(a)(ii) Flame photometer is based on ,
A) Atomic absorption
B) Molecular absorption
C) Atomic emission
D) All the above
(1 marks)
6(a)(iii) Condensed phase rule is applicable to ,
A) One component system
B) Two component system
C) Three component system
D) Multi component system
(1 marks)
6(a)(iv) At eutectic point the compostion of lead and silver has,
A) Lower B.P
B) Highest B.P
C) Lowest M.P
D) Highest M.P
(1 marks)
6(b) Explain the terms phase, component and degree of freedom with an example involved in the satement of phase rule.(6 marks) 6(c) Explain the application of phase rule to one component system.(5 marks) 6(d) Explain the theory and applications of colorimetry in the estimation of copper.(5 marks)


Choose correct answers for the following;

7(a)(i) Natural rubber is the polymerized form of,
A)Isoprene
B) Chloroprene
C) Propene
D) Syrene
(1 marks)
7(a)(ii) A plastic which can be softened in heating and hardened on cooling is called,
A) Thermoplastic
B) Thermo setting plastic
C) Thermoelastic
D) None of these
(1 marks)
7(a)(iii) Polymer composites consists of,
A) Matrix and Plasticizer
B) Fibre and Matrix
C) Fiber and Plasticizer
D) All the above
(1 marks)
7(a)(iv) Condensation polymerization is also called as,
A) Step growth polymerisation
B) Chain growth polymerization
C) Copolymerisation
D) None of these
(1 marks)
7(b) Discuss the free radial mechanism of polymerization taking ethylene as a momomer.(4 marks) 7(c) Give the synthesis and applicationsof,
(i) PMMA
(ii) Epoxy resin
(6 marks)
7(d) What is glass transition tempreature? Mention the factors that influence Tg. Define conducting polymer and give an example.(6 marks)


Choose correct answers for the following;

8(a)(i) Alkalinity of H2O is due to the presence of,
A) Hydroxide ions
B) Carbonate ions
C) Bicarbonate ions
D) All of these
(1 marks)
8(a)(ii) The indicator used in total hardness determination is,
A) EBT
B) Patton & Reeder
C) Methyl orange
D) Phenoltphthalene
(1 marks)
8(a)(iii) The indicator used in total hardness determination is,
A) Zr-SPADNS
B) NH3
C) BaCl2 D) Phenol disulphonic acid
(1 marks)
8(a)(iv) As the tempreature increases, the amount of dissolved O2 of water sample
A) Increases
B) Decrease
C) Has no effect
D) None of these
(1 marks)
8(b) Explain gravimetric method of estimation of sulphate(4 marks) 8(c) Define COD and BOD, 25cm3 of an effluent sample requires for oxidation 8.3 cm3 of 0.001 M K2Cr2O7 Calculate the COD of the effluent sample .(5 marks) 8(d) Mention the impurities present in natural water. Explain reverse osmosis process of desalination of water.(7 marks)

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