ECE Question Papers - Chemistry - 1 Sem

7/27/2019 ECE Question Papers - Chemistry - 1 Sem

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Code No: 09A1BS03 R09 Set No. 1I B.Tech Examinations,June 2011

ENGINEERING CHEMISTRY

Common to CE, ME, CHEM, BME, IT, MECT, MEP, AE, BT, AME, AIE,

ICE, E.COMP.E, MMT, ETM, EIE, CSE, ECE, EEE

Time: 3 hours Max Marks: 75

Answer any FIVE Questions

All Questions carry equal marks

1. (a) Discuss the phenomenon and applications of

i. metal cladding and

ii. electroplating.

(b) What is the influence of nature of environment on corrosion. [8+7]

2. Justify the following statements with proper illustrations

(a) At triple point the system has zero degree of freedom

(b) The fusion curve of ice has negative slope where as sublimation curve haspositive slope. [7+8]

3. (a) Explain the terms homopolymer and co-polymer with suitable examples.

(b) Write notes on

i. Guna-S rubber

ii. polyurethane rubber. [4+5+6]

4. (a) How is coal graded? Explain your answer with the composition, calorific valuesand applications of the different grades of coal.

(b) Give an account of the advantages and disadvantages of coal over gaseousfuels. [8+7]

5. How are the following properties influence the stability of refractories?

(a) Chemical innertness.

(b) Refractoriness under load.

(c) Refractoriness.

(d) Dimentional stability. [15]

6. Write an account of the following

(a) Micelles

(b) Dialysis. [8+7]

7. (a) Explain the principle of the hydrogen-oxygen fuel cells.

(b) Differentiate between electrolytic cells and concentration cells with suitableexamples. [8+7]

3

Code No: 09A1BS03 R09 Set No. 18. (a) What is desalination?

(b) Describe the different methods used for desalination of water. [2+13]

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1. (a) Define the terms:

i. Specific conductance

ii. Equivalent conductance of an electrolyte. How do they vary on dilution?

(b) Describe how the equivalent conductance of a 0.01M solution of NaNO3 isdetermined experimentally. [7+8]

2. Write short notes on the following.

(a) Functionality.

(b) Free-radical chain polymerization.

(c) Ionic polymerization. [4+5+6]

3. (a) Explain the principle involved in wet corrosion.

(b) What are organic paints? Explain their constituents and functions. [8+7]

4. (a) Give an account of the classification of the fuels with suitable examples.

(b) Define Octane number of gasoline. What is its significance and how is it mea-sured? Why ethylene dibromide is added when TEL is used as an antiknockreagent? [6+9]

5. Deduce the expression F+P=C+2 and explain the terms involved with suitable

illustrations and the significance of the terms involved. [15]

6. (a) What is caustic embrittlement?

(b) Explain the priming and foaming in boilers.

(c) Write a note on phosphate and carbonate conditioning of water. [4+6+5]

7. Write an account on the following

(a) Electro phoresis

(b) BET Adsorption isotherm. [7+8]

8. Give an account on the engineering applications of Insulators and superconductors.[15]

5

JNTUW

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Code No: 09A1BS03 R09 Set No. 2I B.Tech Examinations,December -January, 2011-2012


Common to CE, ME, CHEM, BME, IT, MECT, MEP, AE, BT, AME, ICE,

E.COMP.E, MMT, ETM, EIE, CSE, ECE, EEE, MIM, MIE




1. (a) Give an account on Arrhenius theory of ionisation.

(b) What are potentiometric titrations? Explain their applications. [7+8]

2. (a) What is polyethylenephthalate? How it is manufactured? Explain its uses infibre-manufacture.

(b) Write an account of preparation, properties and uses of thiokol rubber. [8+7]

3. (a) Write a short noteon the following:-

i. Electodialysis

ii. Break-point Chlorination.(b) Discuss the corrosion in boilers. [5+5+5]

4. Give an account of the analytical applications of colloids. [15]

5. Explain the following with suitable examples

(a) Condensed phase rule

(b) Pattinsons desilverisation of lead. [8+7]

6. (a) Explain the corrosion of metals and the different types of corrosions.

(b) Give an account of electrochemical theory of corrosion. [6+9]

7. With help of a neat diagram explain the construction and working of Junkerscalorimeter for the analysis of gaseous fuels. [15]

8. (a) What is superconductivity and its applications?

(b) Explain the phenomenon of the sup erconductivity. [7+8]

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1. (a) How are metals protected by impressed current method?

(b) Explain the galvanisation and tinning processes of metals. [6+9]

2. (a) What is Vulcanization? Why is this carried out?

(b) Write a note on polyurethanes.

(c) Discuss the processing and engineering uses of natural rubber. [5+5+5]

3. Explain the following mechanisms with suitable illustrations.

(a) Fluid film lubrication.

(b) Extreme pressure lubrication.

(c) Boundary lubrication. [6+4+5]

4. (a) Write a note on single electrode potential and ion selective electrodes.

(b) Differentiate between reversible and irreversible cells.

(c) Define the term Transport number and explain how is it determined experi-mentally? [4+4+7]

5. Explain the Tyndal effect by Zsigmondys ultramicroscope and electron microscope.[15]

6. Give proper explanations for the following statements

(a) The fusion curve of ice has a negative slope whereas the sublimation curve haspositive slope in the phase diagram

(b) In lead-silver system, isobaric phase diagrams are studied. [7+8]

7. (a) What are the specifications of potable water?

(b) Write a short notes of break-point chlorination.

(c) Discuss the process of priming and foaming. [4+6+5]

8. Distinguish between the following:

(a) Gross calorific value from net calorific value.

(b) Thermal cracking from catalytic cracking.(c) Gaseous fuels from liquid fuels. [6+5+4]

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1. (a) Differentiate the dry process from wet process of manufacture of cement.

(b) Give an account of setting and hardening of cement. [8+7]

2. (a) Explain the electrochemical theory of corrosion of metals with special referenceto rusting of iron.

(b) Write a note on galvanizing and metal cladding. [8+7]

3. Differentiate the following with suitable illustration

(a) Phase rule from condensed phase rule

(b) Eutectic point from triple point. [7+8]4. With the help of neat sketches explain the following processes.

(a) Bergeous process for synthesis of petrol.

(b) Fluidbed catalytic cracking. [8+7]

5. (a) Describe the zeolite process for softening of hard water.

(b) Discuss the methods for disinfectaion of water. [8+7]

6. Explain the synthetic methods, properties and applications of the following elastomers:-

(a) Buna-S rubber

(b) Butyl rubber

(c) Thiokol rubber. [5+5+5]

7. Write a detailed account on the following

(a) Quantum dots

(b) Applications of nanotechnology to medicine. [8+7]

8. (a) Describe the experimental method for the determination of the pH of a solu-tion, using quinhydrone electrode.

(b) What are conductometric titrations? Explain their applications. [7+8]

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1. Write the detailed account on the following:

(a) Triple point

(b) Condensed phase rule. [8+7]

2. (a) Write a brief account on dry corrosion. Explain the factors affecting drycorrosion.

(b) What is cathodic protection? How is it done by using sacrificial anode method?[9+6]

3. (a) What are colloids? How are they classified?(b) Differentiate the dispersed phase from dispersion medium.

[8+7]

4. Give an account of the applications of the following:

(a) Refractories.

(b) Thermal and electrical insulators.

(c) Superconductors.

(d) Lubricants. [15]

5. What are the main constituents of coal? How are they analysed? Explain thesignificance of the different constituents of coal. [15]

6. (a) Explain carbonate and non-carbonate hardness of water. List the variousdisadvantages of hard water for domestic use.

(b) One liter of water from an under ground reservoir in Nalgonda Town in AndhraPradesh the following analysis. for its contents:: Mg(HCO3)2 = 0.0146 gms;Ca(HCO3)2 = 0.0081 gms; MgSO4 = 0.0012 gms; CaSO4 = 0.0136 gms; NaCl= 0.0585 gms; Organic impurities = 100 mg; Calculate temporary, permanentand total hardness of this sample of water in degree French. [8+7]

7. (a) The specific conductivity of a N/50 solution of NaCl at30

0

c is 0.003686 ohm

1

cm

1

.If the resistance offered by the solution when placed in a cell is 1,500ohms,calculate Cell constant and Equivalent conductance of solution.

(b) Write a note on hydrogen-oxygen fuel cells. [8+7]

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Code No: 09A1BS03 R09 Set No. 38. What are conducting polymers? Explain the role of polyacetylens and polyanilines

as conducting polymers. [15]

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1. What are the properties of a good lubricant? What is its significance? [15]

2. (a) What is Gibbs phase rule, its significance and limitations?

(b) Explain with suitable examples the terms involved in Gibbs phase rule. [8+7]

3. (a) What is a single electrode potential? Describe a method for its determination.

(b) Write the cell reactions of a Daniel cell.

(c) Write a brief account of concentration cells. [7+4+4]

4. Write a detailed account on the following:

(a) Origin of charge on colloids.

(b) Stability of colloids. [8+7]

5. (a) Describe the different types of corrosion and discuss the factors that affectcorrosion.

(b) What is cathodic protection?

(c) Write a note on electro plating. [9+2+4]

6. Describe the preparation, properties and uses of the following :-

(a) PVC

(b) Terylene

(c) Polystyrene. [5+5+5]

7. (a) What is the principle involved in internal treatment of boiler few water?

(b) One litre of water from an under ground reservoir in Tirupathi Town in AndhraPradesh showed the following analysis for its contents: Mg(HCOO3)2 = 42mg; Ca(HCO3)2 = 146mg; CaC l2 = 71mg; NaOH = 40mg; MgSO4 = 48mg; organic impurities = 100 mg; Calculate temporary, permanent and totalhardness of this sample of 10,000 litres of water. [8+7]

8. Give an account of the analysis of flue gases by Orsat apparatus and its significance.

[15]

1








1. (a) What is an electro chemical cell? Explain the construction and reactions ofany electro chemical cell.

(b) Explain how Nernst equation is useful in calculating the electrode potential?[9+6]

2. (a) State and explain BET equation for multilayer adsorption.

(b) How is the surface area of an adsorbent is determined with the help of BETequation? [7+8]

3. What are phase diagrams? How are they drawn? What is the significance of phasediagrams? [15]

4. (a) Define metallic corrosion? Explain the mechanism of electrochemical corrosionby hydrogen evolution and oxygen absorption.

(b) Explain differential aeration corrosion with a suitable example. [9+6]

5. (a) What is PVC? How is it prepared? Explain the differences between plasticizedPVC and unplasticized PVC.

(b) Write a note on vulcanization of rubber. [8+7]

6. Write shortnotes on the following.

(a) Knocking

(b) Natural gas.

(c) Refining of petroleum. [6+4+5]

7. (a) What are thermal insulators? How do they differ from electrical insulators?

(b) Give an account of the organic and inorganic thermal insulators with suitableexamples and applications. [7+8]

8. Write short notes on following:

(a) Calgon treatment

(b) Phosphate conditioning

(c) Ion-exchange process. [5+5+5]

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1. (a) Discuss the phenomenon and applications of

i. metal cladding and

ii. electroplating.

(b) What is the influence of nature of environment on corrosion. [8+7]

2. Justify the following statements with proper illustrations

(a) At triple point the system has zero degree of freedom

(b) The fusion curve of ice has negative slope where as sublimation curve haspositive slope. [7+8]

3. (a) Explain the terms homopolymer and co-polymer with suitable examples.

(b) Write notes on

i. Guna-S rubber

ii. polyurethane rubber. [4+5+6]

4. (a) How is coal graded? Explain your answer with the composition, calorific valuesand applications of the different grades of coal.

(b) Give an account of the advantages and disadvantages of coal over gaseousfuels. [8+7]




(c) Refractoriness.


6. Write an account of the following

(a) Micelles

(b) Dialysis. [8+7]

7. (a) Explain the principle of the hydrogen-oxygen fuel cells.

(b) Differentiate between electrolytic cells and concentration cells with suitableexamples. [8+7]

3

Code No: 09A1BS03 R09 Set No. 18. (a) What is desalination?

(b) Describe the different methods used for desalination of water. [2+13]

4


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1. (a) Define the terms:

i. Specific conductance

ii. Equivalent conductance of an electrolyte. How do they vary on dilution?

(b) Describe how the equivalent conductance of a 0.01M solution of NaNO3 isdetermined experimentally. [7+8]

2. Write short notes on the following.

(a) Functionality.

(b) Free-radical chain polymerization.

(c) Ionic polymerization. [4+5+6]

3. (a) Explain the principle involved in wet corrosion.

(b) What are organic paints? Explain their constituents and functions. [8+7]

4. (a) Give an account of the classification of the fuels with suitable examples.

(b) Define Octane number of gasoline. What is its significance and how is it mea-sured? Why ethylene dibromide is added when TEL is used as an antiknockreagent? [6+9]

5. Deduce the expression F+P=C+2 and explain the terms involved with suitable

illustrations and the significance of the terms involved. [15]

6. (a) What is caustic embrittlement?

(b) Explain the priming and foaming in boilers.

(c) Write a note on phosphate and carbonate conditioning of water. [4+6+5]

7. Write an account on the following

(a) Electro phoresis

(b) BET Adsorption isotherm. [7+8]

8. Give an account on the engineering applications of Insulators and superconductors.

[15]

5

Code No: RR10301 RR Set No. 2I B.Tech Examinations,December 2010


Common to ME, MECT, MEP, AE, AME, MMT




1. (a) Discuss the fundamental principles of combustion calculations.

(b) Write an explanatory note on calorific value of fuels. [8+8]

2. (a) How is metallurgical coke obtained by Beehive oven method. Why is cokepreferred to coal in metallurgical processes?

(b) Describe the estimation of

i. sulphur.

ii. Nitrogen in coal. [8+8]

3. Compare and contrast the lime-soda process, permutit process and ion- exchangeresin process used for softening of water. [16]

4. (a) What are elastomers? Give examples.

(b) What are the ingradients used in compounding of plastics? What are theirfunctions? [4+12]

5. What are Refractories? Explain Thermal spalling, strength and porosity of therefractories. [16]

6. (a) Define corrosion.

(b) How will you differenciate oil varnish from spirit varnish?

(c) Explain with a diagram, why a metal rod half immersed vertically in waterstarts corroding at the bottom. [4+6+6]

7. Determine the amount of soda and lime required in Kgs to soften 5000 lit of watercontaining the following salts MgCl2 = 15.5 ppm, Ca(Hco3)2 = 32.5 ppm, Ca(No3)2= 22.4 ppm, NaCl = 50 ppm, KCl = 22.5 ppm. [16]

8. Write a note on lubricants with special reference to their classification, mode ofaction, examples and applications. [16]

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1. (a) Define corrosion.(b) How will you differenciate oil varnish from spirit varnish?








7. (a) How is metallurgical coke obtained by Beehive oven method. Why is coke

preferred to coal in metallurgical processes?(b) Describe the estimation of

i. sulphur.




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i. sulphur.













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i. sulphur.









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Code No: 09A1BS03 R09 Set No. 2I B.Tech Regular Examinations,JUNE 2010



E.COMP.E, MMT, ETM, EIE, CSE, ECE, EEE




1. (a) What is Gibbs phase rule, its significance and limitations?

(b) Explain with suitable examples the terms involved in Gibbs phase rule. [8+7]

2. Write an account on the refining of petroleum by explaining the composition,boilingrange and uses of different fractions obtained during refining. [15]

3. (a) What are concentration cells? How can the EMF of a concentration cell beevaluated?

(b) Write short notes on single electrode potential and its significance. [9+6]

4. Explain the following statements with proper illustrations.(a) Tyndal cone is observed when a beam of light is concentrated on colloidal

systems.

(b) Alums are used for the treatment of water supplied by municipalities. [8+7]

5. Write a brief account on the following:

(a) Heat capacity of a refractory material.

(b) Porosity of a refractory material.

(c) Thermal expansion and contraction.

(d) Refractoriness. [15]

6. (a) How are synthetic high polymers classified?

(b) Discuss the preparation, properties and uses of various grades of polythenes.[8+7]

7. (a) What are the factors that lead to caustic embrittlement in boilers? How canthis be prevented?

(b) Distinguish between Zeolite process and Ion-Exchange process. [8+7]

8. (a) Explain the process of galvanizing and tinning.

(b) What are organic paints? Describe their constituents. [8+7]

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1. What is meant by a phase diagram? With the help of aphase diagram,explainthefollowing ?

(a) Triple point

(b) Eutectic point. [15]

2. Classify the following fuels space by furnishing proper reasons.

(a) Coke

(b) Petroleum

(c) Benzol(d) Biogas

(e) Lignite

(f) LPG

(g) Natural gas

(h) Anthracite. [15]

3. What is meant by coagulation of colloids? How is it brought out? [15]

4. (a) Why is hard water harmful to boilers?

(b) Describe the causes and harmful effects of scale formation.(c) One liter of water from Khammam Dist. in Andhra Pradesh showed the

following analysis: Mg(HCO3)2 = 0.0256 gms, Ca(HCO3)2 = 0.0156 gms, NaCl= 0.0167 gms, CaSO4 = 0.0065 gms, and MgSO4 = 0.0054 gms. Calculate thelime & soda required for softening of 10,000 litres of water. [4+4+7]

5. (a) What is the difference between free-radical and ionic chain polymerization?

(b) Write a note on preparation, properties and uses of

i. bakelite

ii. PVC. [5+5+5]




2

Code No: 09A1BS03 R09 Set No. 4(c) Refractoriness.


7. (a) What do you understand by electrochemical series? How is this series usefulin the determination of corrosion of metals. 8M

(b) The resistance of a 0.1N solution of an electrolyte of 40 ohms. If the distancebetween the electrodes is 1.2 cm and area of cross section is 2.4 cm2. calculateequivalent conductivity. [8+7]

8. (a) Discuss the influence of following factors on corrosion:-

i. Over voltage

ii. Nature of the metal

iii. Nature of environment.

(b) Explain the nature and role of constituents of organic paints. [9+6]

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1. (a) Explain the electrochemical theory of corrosion of metals with special referenceto rusting of iron.

(b) Write a note on galvanizing and metal cladding. [8+7]

2. Write a brief account on the following:

(a) Wet Process for the manufacture of cement.

(b) Setting and hardening of cement. [8+7]

3. (a) What are colloids? How are they classified?

(b) Differentiate the dispersed phase from dispersion medium. [8+7]

4. What is meant by cracking of hydrocarbons? What are its objectives? With thehelp of neat sketches explain the production of petrol by catalytic cracking. [15]





(a) Buna-S rubber

(b) Butyl rubber


7. (a) Differentiate between lime-soda and zeolite processes for softening of watergiving merits and demerits of the two processes.

(b) How is the hardness of water expressed? What are the various units employed?Explain their interconversion. [9+6]

8. (a) Give reasons for the following statements:-i. When a zinc rod is dipped in a solution of aq. copper sulphate, copper is

precipitated out.

4

Code No: 09A1BS03 R09 Set No. 1ii. Nerrist equation is applicable for the determination of emf of a concen-

tration cell.

(b) State and explain the Kohlrauschs law and its applications. [6+9]

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1. (a) What are fuels? How are they classified? What are the advantages of gaseousfuels?

(b) Give an account of the anlysis of coal by ultimate analysis and its significance.[7+8]

2. (a) How are metals protected by impressed current method?

(b) Explain the galvanisation and tinning processes of metals. [6+9]

3. Differentiate the following with suitable examples:-

(a) Polymer from monomer

(b) Homo polymer from co-polymer

(c) Step growth polymerization from chain polymersation. [5+4+6]

4. (a) Define the terms specific, equivalent and molar conductivities. How do theyvary with dilution.

(b) Calculate the cell constant of a cell having a solution of concentration N/30gm. equiv/litre of an electrolyte which showed the equivalent conductance of120 Mhoscm2 gm equiv1. [8+7]

5. (a) Explain the various reasons for failure of a refractory material.

(b) Differentiate refractories from insulators. [7+8]

6. (a) Write a note on complexometric titrations used for estimation of hardness ofwater by EDTA.

(b) Explain the process of electrodialysis. [8+7]

7. Explain how iron-carbon phase diagram provides information about the formationof different phases in iron-carbide system. [15]

8. What are fullerenes? Present an account of applications of fullerenes. [15]

6

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USN Itl 10cHm1 2{22

(05 Marls)(04 Marls)

FirsUsecond Semester B.E; Degree Examination, December 20llEngineering GhemistryTime: 3 hrs. Max, Marks:100Note: l. Answer any FfVEfult questions, choosing at leost twofrom each part.2. Answer all objective type questions only on OMR sheet page 5 of the answer booklet

3. Ansu,er lo objeclive type questions on sheets other than OMR will nol be valuedI a. choose your answers for ur" rorrt rl#T - A (04 Mqrl*)i) The reference electrode used in measureurent of stairdard reduction potential isA) Standard calomel electrode B) Hydrogen electrodeC) Ag-Agcl electode D) Standard hydrogen''electodeiD When the concentration of chloride:ions in Ag-Agcl electrode utcreases, the potentialofthe electrodeA) Increases B) Decr,easesC) Ooes not change D)None of these

iii) Nernsts equation is based onA) Thermodynaqic princiPleB) An gqtla,dog,for.redox pqtentialC) Inc-rease in the free energy of the systemD) None of the aboveiv) In a Galvanic cell oxidation takes p(ace atA) ,Electolyre B) Cathode C) Anode D) Salt bridgeb. What are consentration cells? Derive an expression for the EMF of-a congentratioio"flJi"*,c. Define standard electrode potential. Explain the origin of electrode potential. (06 Merks)d. An electo chemical celt is formed from nickel and lead electrodes having 0.01m NiSO+ and .0.5m PbSO4 Electrolytes. The standard etecnode potentials of Ni and Pb electrodes are- A.24Y and - 0.13V reryectively, Write ,ttre:cell scheme, sell. reaction,and rcalculate EMF of

ahe cell at 298 K&. Choose your answers for the following :i) Cycle life is applicable only toA) Primary batteriesC) Reserve batteriesii) The electrolyte used in zo * air battery isA) aQ HzSOcC) Aq,KOF{

A) They are light in weightC) They produce culrent at now cost

B) Secondary batteriesD) AII the above,B) Conc.KC/

:D) Aq.Hcl

B) They are eco ftiendlyD) Nl the above

iir) EMF of abattery depends on' Al St "drrd etr"troiu potential B) Tfiperature 'lC) Reaction quotient D) All the aboveiv) The firet celliare mor-e'superior than the batteries asI of 4


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b.c.d.

TOCHE1z|zzDiscuss constnrction rrrq working of load-acid storage battery. (06 Marks)Explain construction3nd working ofNi-MH batterv. (04Marks)What are fuel cells? Describe the construction ahd working of CHIOH - Oz fuel cell.. (06 Marks)

3a. Choose your answers for the following :i) At high hydrogen over voltage, the rate of corosionA) Increases B) Decreasesc) Ihcreases initially and then decreases D) Remains un changedii) Metal iron is coated with zinc metal to prevent corrosion. The proc-ess isA) Anodie coating B) Cathodic coat'ingC) Inorganic coating O; faintingiil) In corrosioq the gas which is produced in acidic medium is4) HVdrogen B) O:qygenC) Nitrogen pj Car[In dioxideA) ,Cralvauie.corro.sion B) Inter_ granular corrosionC) Ditre'nentialaerationcorrosion n) Waterii"*;;;i;;-Discuss :i) Stess corl-osionii) Warcr line corrosion. ':Explainthe influence of following factors on therate of conosion :i) Nat.re of corrosionproduct ; ii) Anodic and cathodi" *o -Describe the f,oltrowing procss : i) cralvanising ; ii) Tiirning.

b.

c,

(04 Msrks)

(06 IVIarla)(0d Marks)(016 Marks)

4 a. choose your aoswers for the follorring : (04 Marks)i) In elecfroplating, the article to be plated is subjected to pickling. This is toA) Remove grease fil Increase rate Jf platingC) Remove oxide scale ni Oet a bright depositiD Thc tlere;ompoSition potential is equal toA) BackEhiIF B) Cell voltagec) curretrt density oi N"n";?fi; aboveiii) Brighhers are addea to plating bath in order to,-.) Tu get unifom depositry Make Sain size of the deposit smaller than l, of lighrC) To get thick depositD) Remove colouiv) Which of,the following is essential in electoless platingA) Oxidising agentC) Anode B) Reducing agent!' Ilu, is meaut by metal finishing? Explain tnr pro*is or;h.*illfi" of gold. (06i ?*x$:*::x-:'-*I*yl,::1r:r]*,Bq :.,:r"[ e -- c q{d' what is electoless plating? Explain Jectroless$latiliffi"k"l,.ffi relavent."di;;;:(M Marks)

D) Electrical enerflEss of electcplufns of gold. (06 Marta)

2at4(06 Marla)

r0cHE12122PART _ B

5 a. Choose your ar$wers for the following : (04 Marls)i) The process of breaking, doyn hydrocarbons of higher molecular weigbt into lighterhYdrocarbons is known asA) Refining B) RefomingC) Isomerization D) Craokingii) The octane number of a fuel is a measure ofA) Its ability,to rpsist anti knockingB) Inability to offer resistance for knockingC) Its ab"ilitYto resist knqckingD) iNongof,thqab,ove.iii) Theaddition of TEL to gasoline isA) EecrtasPq the octane numberB) higeases:the octane ntunberC) Eecreases:the cetane ntrmberD) tncreases the cetanenunrberiv) Photovoltaic cell consists of- ' Al p-njrrnction B)n-tlpejunctionc) p''t?g'junctiion D) No.neofttrg.ubo":

What is refo1pi6C of petroleum? Give any four reactions involved in reforming. (06 Marls)Discuss the foibn'ing : i) Power alcohpl ; ii) Biodiesl.' (06 Marlrs)On burning 0.85 x f O-l tg of a sotid fuel in a bomb calorimeter, the temperature of 2.1 kgwater is,raised.fiom 24oCta 2t.6oC. The water equivalelrt of calodmeter and latent heatgfsteano are l.l kS and 2454 kJ/ke respectively. Specific heat of water is 4.1E7 kJ/kg. If thefuel contains}%hydrogen, calculate its gross and net calorific values. (04 Marks)

(04 Marks)6 a. Choose your answers for the following :i) Flalne photometr is base


15/25

7 a. Choose your answers for the following :i) Kevlar is aA) Polyurethane B) Polyoarbonate C) Folystyreneii) Which one is a conducting polymer?

A) Neoprene nrbberC) Styru - butadiene rubber ts) tsutyl rubberD) Naftual rubber

B) Redox reaetionn) Complexometric reaction

lOCHET2I2z(04 Marls)

D) Polyamide

(04 klarks)

(06 Marki)(06 Marks)

A) Aniline B) Pyrrole C) Foly acetylene D) Acetyleneiii) Very high molecular weight polyrners will have : ::A) Low Tg B) Hish Tg C) tv{oderate Tg D) No T'giv) The polymer widely used in making inner tuhes,of tyre isb. S/hat are polymers? Discuss the free radical mechauism.of poll.merization of ethylene"

Give the synthesis and an application sf i) .nrb,ber. ; ii),Teflon. ffi H::[iIVhat are the deficiencies of natural rubber? Exlilain,vulbaoization of nrbber. (05 Marks). ,. ' . .r.' 'l

c.d.

8 a. Chooseyour answers forthe following :i) Chlmide content of water sample is detemrined by ,

A) Neutralisation reactionC) Precipitation reaction

A) Colorimetric method B) Argentometric method' C)'SP,ADNS'method . .;. ,D),;Gravirae&icmethodii) As the temperahre increases, the amount of dissolved,o-xygen.of water sampleA).'trnur,eaqes B)r,Eecrcases,C) Has no effect D) None ofthe,aboveiiD Reverse osmosis is amethod of geuingpure water fromA) Sewage water B) .lndu$-trial w,aste waterC) Sea water D) River wateriv) Estimation of total hardness of water using EDTA titrant involvesb. Howis alkalini{y of water caused? Explainthemethod of determi4ationof alkalinity. :,c.d. Describe elec&odialysis method of desalinadonof rryater.25 eC of waste rnmter was mixetl with 25 CC of KzCrzO:, acidified and refluxed. Theumeacted Kz CrzOt requircd 8.2 CC of 0.2N FAS. In a blank titation 25 CC of KzCrzOzacidified required 16.4 CC of same FAS. Calculate COD of waste water. (04 Marks)

*!t***

4 nf 4

Code No: 09A1BS03 R09 Set No. 2I B.Tech Examinations,December 2010







1. (a) Outline the electrochemical theory of corrosion and explain the mechanism ofrust formation in acidic and neutral medium.

(b) Write a brief account of cathodic protection. [9+6]

2. (a) Write a short note an electro chemical series?

(b) Explain the functioning of a Galvanic cell? [7+8]

3. (a) Explain the terms chain and step-growth polymerizations with appropriateexamples.

(b) Describe the preparation, properties and uses of

i. polythene

ii. nylon ( 6,6 ) [5+10]

4. Write a detailed account on the following:

(a) Origin of charge on colloids.

(b) Stability of colloids. [8+7]

5. (a) What do you understand by the priming and foaming problems in boilers?

(b) Differentiate between scale and sludge formation in boliers. What are theirdisadvantages? [8+7]

6. How are the following classified?

(a) Refractories

(b) Insulators.

(c) Lubricants.

(d) Superconductors. [15]

7. What is meant by heat treatment of steel? Explain the different heat treatmentprocesses carried out with relevant applications. [15]

8. Distinguish between the following:

(a) Gross calorific value from net calorific value.

(b) Thermal cracking from catalytic cracking.(c) Gaseous fuels from liquid fuels. [6+5+4]

1


16/25








1. Give an account of the following:

(a) Criteria of a good lubricant.

(b) Viscosity.

(c) Fluid film lubrication. [5+5+5]

2. (a) Explain the differences between thermoplastics and thermoset plastics.

(b) Outline the preparation, properties and uses of polyester. [8+7]

3. State and explain Gibbs phase rule. Discuss its significance, applications and limi-tation by mentioning proper illustrations. [15]

4. (a) Write the structure of EDTA and the complex formed between Mg+2 andEDTA.

(b) What are boiler-troubles? Explain the scale and sludge formation in boilers.[4+11]

5. Give an account of the analytical applications of colloids. [15]

6. (a) Define the terms specific, equivalent and molar conductivities. How do theyvary with dilution.

(b) Calculate the cell constant of a cell having a solution of concentration N/30gm. equiv/litre of an electrolyte which showed the equivalent conductance of

120 Mhos cm2

gm equiv1

.

[8+7]7. (a) Discuss the influence of following factors on corrosion:-

i. Over voltage

ii. Nature of the metal

iii. Nature of environment.

(b) Explain the nature and role of constituents of organic paints. [9+6]

8. (a) ExplainHCV and LCV of fuels and how do they differ? What is their signifi-cance?

(b) A sample of coal contains the following composition Carbon = 84%, Hydrogen

= 12%, Oxygen = 2%, Sulphur = 1% and the remainder being ash. Calculatethe gross and net calorific values of the fuel. [8+7]

2








1. (a) Distinguish Electrochemical cells from Electrolytic cells with suitable illustra-tions.

(b) What is electrode potential? How is it determined by using Calomel StandardElectrode. [7+8]

2. What is cracking? Explain the different types of cracking processes along with theiradvantages. [15]

3. With the help of neat diagrams explain the following criteria of lubricants.

(a) Viscosity

(b) Flash and fire point.

(c) Carbon residue. [4+7+4]

4. (a) What is natural rubber? How is it processed?

(b) How is crude rubber obtained from latex?

(c) Write a note on preparation, properties and uses of buna-s-rubber? [5+5+5]

5. (a) Explain sacrificial anodic protection method of controlling corrosion.

(b) Write a note on anodic protection and the nature of corrosion product. [6+9]

6. Explain the technical applications of colloids with suitable illustrations. [15]7. (a) What are the different allotropes of iron, their transformations and lattice

patterns?

(b) Explain the various micriconstituents of iron-carbon alloys which contain theallotropic forms of iron. [7+8]

8. (a) What are scales? How are they formed in boilers? What are their disadvan-tages?

(b) What are the prevention methods for scale formation in boilers. [6+9]

3


17/25








1. (a) What is cell constant? How is it determined?

(b) Describe a method for the determination of pH of a solution using StandardCalomel electrode. [7+8]

2. Explain the following with suitable illustrations.

(a) Sweetening of petrol

(b) Bergeous method of synthesis of petrol. [7+8]

3. Explain the setting and hardening of cement with relevant chemical reactions in-volved. [15]




5. (a) Describe the zeolite process for softening of hard water.

(b) Discuss the methods for disinfectaion of water. [8+7]


(a) Buna-S rubber(b) Butyl rubber


7. Write an account of the applications of nano technology to energy resources andfood science. [15]

8. Write notes on the following:-

(a) Hot dipping

(b) Galvanizing

(c) Tinning

(d) Electroplating. [15]

4

Code No: 07A1BS07 Set No. 1I B.Tech Regular Examinations, May/Jun 2008

ENGINEERING CHEMISTRY( Common to Mechanical Engineering, Mechatronics, Production

Engineering and Automobile Engineering)Time: 3 hours Max Marks: 80

Answer any FIVE QuestionsAll Questions carry equal marks

1. (a) Estimation of free chlorine in water samples.

(b) Discuss the impurit ies in water and their effects. [9+7]

2. (a) Describe the demineralisation of water by ion - exchange method.

(b) Mention the disadvantages of using hard water for any two industries. [12+4]

3. (a) What is meant by differential aeration corrosion? Illustrate with suitableexamples.

(b) How is rate of corrosion influenced by

i. Nature of corrosion product

ii. Relative anodic to cathodic areas

iii. Temperature and moisture. [7+9]

4. (a) Discuss how the surface of a metal is prepared prior to the application of aprotective coating.

(b) Write the important applications of protective coating.

(c) Why is moderate current density employed during electroplating? [10+4+2]

5. (a) Explain the preparation, properties and uses of Bakelite.

(b) Describe with a neat sketch, the process of compression moulding. [10+6]

6. (a) What is pyrometric cone equivalent? How it is determined for a refractory?What is its significance?

(b) Write a short note on:

i. porosity

ii. Thermal Conductivity

iii. Dimensional Stability.

iv. strength [8+8]

7. (a) Give the functions of lubricants.

(b) Describe the mechanism of extreme pressure lubrication.(c) How a viscous lubricant is converted into grease? [6+6+4]

8. (a) Explain how fuels are classified with suitable examples.

1 of 2


18/25

Code No: 07A1BS07 Set No. 1(b) Explain the significance of the following constituents present in coal.

i. Moisture

ii. Volatile matter

iii. Ash and

iv. Fixed carbon. [8+8]

2 of 2





1. (a) What is the principle of EDTA method? Explain the estimation of hardnessof water by complexometric method.

(b) Mention the dis-advantages of using hard water for industrical purpose.[12+4]

2. Write short notes on :

(a) Priming and Foaming


(c) Caustic embrittlement. [5+6+5]

3. (a) Explain the following factors influencing the rate of corrosion.i. Nature of corrosion product

ii. Position in electrochemical series

iii. pH.

(b) Differentiate between dry corrosion and wet corrosion. [8+8]

4. (a) What are organic paints? Name their important constituents and their re-spective functions with an example?

(b) Mention the functions of pigment and vechicle in a paint. [12+4]

5. (a) What are elastomers? Give the preparation, properties and uses of Buna S.

(b) Describe a method for moulding of thermoplastic resin. [8+8]

6. (a) What are refractories? How important are the properties - refractoriness underload and thermal conductivity for industrial applications?

(b) Compare acidic and basic refractories with examples. [10+6]

7. Discuss the important properties of lubricating oils which are useful for their eval-uation. [16]

8. (a) Discuss the relative merits and demerits of solid, liquid and gaseous fuels.

(b) Explain the significance of the following constituents present in coal.

i. Total carbon

ii. Hydrogen

iii. Nitrogen

1 of 2


19/25

Code No: 07A1BS07 Set No. 2iv. Sulphur and

v. Oxygen. [6+10]

2 of 2





1. Write a short notes on the following:

(a) Break - point chlorination

(b) Dissolved oxygen

(c) Hardness of water

(d) Sedimentation and coagulation. [4+4+4+4]



(b) Phosphate conditioning(c) Caustic embrittlement. [5+6+5]

3. (a) What is oxidation corrosion and how does it take place? Describe the mecha-nism of oxidation corrosion.

(b) Describe the various factors influencing the rate of chemical corrosion. [8+8]

4. (a) Describe the mechanism of drying of conjugated oils.

(b) Name any four important drying oils.

(c) Define the following:

i. Acid value of an oilii. Saponification Value

iii. Iodine Value. [8+2+6]

5. (a) Why are Silicones called inorganic polymers? Discuss the synthesis of linearchain Silicones.

(b) Why Bakelite cant be remoulded and write its repeating unit?

(c) Describe condensation polymerization with an example [6+4+6]

6. Discuss any FOUR essential properties of a good refractory in detail. [16]

7. Explain the various mechanisms of lubrication in detail. [16]



1 of 2


20/25

Code No: 07A1BS07 Set No. 3i. Total carbon

ii. Hydrogen

iii. Nitrogen

iv. Sulphur and

v. Oxygen. [6+10]

2 of 2





1. (a) Why is sterilization of water necessary? Discuss any two methods of sterilisa-tion.

(b) 0.5 g of CaCO3 was dissolved in dil.HCl and diluted to 1000 mL. 50 mL of thissolution required 48 mL of EDTA solution for titration. 50 mL of hard watersample required 15 mL of EDTA solution for titration. 50 mL of same watersample on boiling, filtering etc, required 10 mL of EDTA solution. Calculatethe different kinds of hardness in ppm. [9+7]







4. (a) Describe the process of sheradizing? Mention its applications?

(b) Distinguish between anodizing and electroplating.

(c) Define Anodizing. [8+6+2]

5. (a) How is HDPE is prepared? Give its properties and uses?

(b) Explain the injection moulding process with a neat diagram? Mention itsadvantages. [8+8]



i. porosity


iii. Dimensional Stability.iv. strength [8+8]


1 of 2


21/25

Code No: 07A1BS07 Set No. 4(b) Describe the mechanism of extreme pressure lubrication.

(c) How a viscous lubricant is converted into grease? [6+6+4]

8. (a) What do you understand by the term knocking in IC engines? Explain itsrelationship with chemical constituents of fuels.

(b) A sample of coal contains 60% carbon, 33% Oxygen, 6.0% Hydrogen, 0.5%Sulphur, 0.2% Nitrogen and 0.3% Ash. Calculate GCV and NCV of coal.

[8+8]

2 of 2





1. (a) Estimation of free chlorine in water samples.

(b) Discuss the impurit ies in water and their effects. [9+7]

2. (a) Describe the demineralisation of water by ion - exchange method.

(b) Mention the disadvantages of using hard water for any two industries. [12+4]

3. (a) What is meant by differential aeration corrosion? Illustrate with suitableexamples.

(b) How is rate of corrosion influenced by

i. Nature of corrosion product

ii. Relative anodic to cathodic areas

iii. Temperature and moisture. [7+9]

4. (a) Discuss how the surface of a metal is prepared prior to the application of aprotective coating.

(b) Write the important applications of protective coating.

(c) Why is moderate current density employed during electroplating? [10+4+2]

5. (a) Explain the preparation, properties and uses of Bakelite.

(b) Describe with a neat sketch, the process of compression moulding. [10+6]



i. porosity


iii. Dimensional Stability.

iv. strength [8+8]


(b) Describe the mechanism of extreme pressure lubrication.(c) How a viscous lubricant is converted into grease? [6+6+4]

8. (a) Explain how fuels are classified with suitable examples.

1 of 2


22/25

Code No: 07A1BS07 Set No. 1(b) Explain the significance of the following constituents present in coal.

i. Moisture

ii. Volatile matter

iii. Ash and

iv. Fixed carbon. [8+8]

2 of 2





1. (a) What is the principle of EDTA method? Explain the estimation of hardnessof water by complexometric method.

(b) Mention the dis-advantages of using hard water for industrical purpose.[12+4]





3. (a) Explain the following factors influencing the rate of corrosion.i. Nature of corrosion product

ii. Position in electrochemical series

iii. pH.

(b) Differentiate between dry corrosion and wet corrosion. [8+8]

4. (a) What are organic paints? Name their important constituents and their re-spective functions with an example?

(b) Mention the functions of pigment and vechicle in a paint. [12+4]

5. (a) What are elastomers? Give the preparation, properties and uses of Buna S.

(b) Describe a method for moulding of thermoplastic resin. [8+8]

6. (a) What are refractories? How important are the properties - refractoriness underload and thermal conductivity for industrial applications?

(b) Compare acidic and basic refractories with examples. [10+6]

7. Discuss the important properties of lubricating oils which are useful for their eval-uation. [16]



i. Total carbon

ii. Hydrogen

iii. Nitrogen

1 of 2


23/25

Code No: 07A1BS07 Set No. 2iv. Sulphur and

v. Oxygen. [6+10]

2 of 2





1. Write a short notes on the following:

(a) Break - point chlorination

(b) Dissolved oxygen

(c) Hardness of water

(d) Sedimentation and coagulation. [4+4+4+4]



(b) Phosphate conditioning(c) Caustic embrittlement. [5+6+5]



4. (a) Describe the mechanism of drying of conjugated oils.

(b) Name any four important drying oils.

(c) Define the following:

i. Acid value of an oilii. Saponification Value

iii. Iodine Value. [8+2+6]

5. (a) Why are Silicones called inorganic polymers? Discuss the synthesis of linearchain Silicones.

(b) Why Bakelite cant be remoulded and write its repeating unit?

(c) Describe condensation polymerization with an example [6+4+6]

6. Discuss any FOUR essential properties of a good refractory in detail. [16]

7. Explain the various mechanisms of lubrication in detail. [16]



1 of 2


24/25

Code No: 07A1BS07 Set No. 3i. Total carbon

ii. Hydrogen

iii. Nitrogen

iv. Sulphur and

v. Oxygen. [6+10]

2 of 2





1. (a) Why is sterilization of water necessary? Discuss any two methods of sterilisa-tion.

(b) 0.5 g of CaCO3 was dissolved in dil.HCl and diluted to 1000 mL. 50 mL of thissolution required 48 mL of EDTA solution for titration. 50 mL of hard watersample required 15 mL of EDTA solution for titration. 50 mL of same watersample on boiling, filtering etc, required 10 mL of EDTA solution. Calculatethe different kinds of hardness in ppm. [9+7]







4. (a) Describe the process of sheradizing? Mention its applications?

(b) Distinguish between anodizing and electroplating.

(c) Define Anodizing. [8+6+2]

5. (a) How is HDPE is prepared? Give its properties and uses?

(b) Explain the injection moulding process with a neat diagram? Mention itsadvantages. [8+8]



i. porosity


iii. Dimensional Stability.iv. strength [8+8]


1 of 2


25/25

Code No: 07A1BS07 Set No. 4(b) Describe the mechanism of extreme pressure lubrication.

(c) How a viscous lubricant is converted into grease? [6+6+4]

8. (a) What do you understand by the term knocking in IC engines? Explain itsrelationship with chemical constituents of fuels.

(b) A sample of coal contains 60% carbon, 33% Oxygen, 6.0% Hydrogen, 0.5%Sulphur, 0.2% Nitrogen and 0.3% Ash. Calculate GCV and NCV of coal.

[8+8]

2 of 2

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ECE Question Papers - Chemistry - 1 Sem