Engg Chemistry R13 Model Question Papers

8/9/2019 Engg Chemistry R13 Model Question Papers

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Gurunana k Instituti ons Prepared by B.Srinivas

R-13

JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech I Year Examinations, June-2014

ENGINEERING CHEMISTRY

(Common to all Branches)Time : 3 hours Max. Marks: 75

PART-A

1.

Answer all the following Sub-questions (a-e: 2Marks; f-j: 3 Marks) Marks: 25a. What are organic paints? b. Write a short note on FRPs.c. Write short notes on Calgon & Phosphate treatmentd. Write a short note on Knockinge. Write a short note on micellef. What are concentration cellsg. Write applications of nanotechnology.h. Write short notes on Reverse Osmosis processi. Distinguish between Gaseous fuels from liquid fuels

j. Write a short note on applications of adsorption.PART-B

Answer all the Questions – All questions carry equal marks Marks: 50

2. (a) Define the terms specific, equivalent and molar conductivities. How do they vary with dilution? (b) Explainthe principle of the hydrogen-oxygen fuel cells.

(OR)(c) Outline the electrochemical theory of corrosion and explain the mechanism of rust formation in acidic andneutral medium. (d) Write a brief account of cathodic protection.

3. (a) Explain the synthetic methods, properties and applications of the following elastomers:- (i) Buna-S rubber(ii) Butyl rubber (iii) Thiokol rubber. (b) What are Biodegrable polymers and mention preparation propertiesand uses of poly vinyl acetate and poly lactic acid.

(OR)(c) Give an account of setting and hardening of cement with chemical reactions (d) Give an account of the

properties and Criteria of a good lubricant

4. (a) Write in detail an account on the following boiler troubles: i) Scale & Sludge’s formation ii) Causticembrittlement iii) Priming & Foaming. (b) Discuss the methods for disinfection of water.

(OR)c) Why is Ion exchange process preferred over Zeolite-process for the softening of water for use in boilers? d) 2liters of water obtained from a bore well in Patencheru near Hyderabad gave the following analysis forsalts. CaSO 4=13.6mg, MgCl 2=48mg, Ca(HCO 3)2=32.4 , Mg(HCO 3)2=14.6mg, NaCl=11.7mg. Find the totalhardness of water in 0Cl & 0Fr units.

5. (a) Explain HCV and LCV of fuels and how do they differ? What is their significance? (b) A sample of coalcontains the following composition Carbon = 84%, Hydrogen = 12%, Oxygen = 2%, Sulphur = 1% and theremainder being ash. Calculate the gross and net calorific values of the fuel.

(OR)(c) Give an account of the analysis of coal by proximate and ultimate analysis and its significance. (d) Writeshort notes on the following. (i) Natural gas. (ii) Refining of petroleum

6. Give proper explanations for the following statements (a) The fusion curve of ice has a negative slope whereasthe sublimation curve has positive slope in the phase diagram (b) In lead-silver system, isobaric phase diagramsare studied .

(OR)Explain the following statements with proper illustrations. (c) Tyndal cone is observed when a beam of light isconcentrated on colloidal systems. (d) Electro phorosis (e) Alums are used for the treatment of water supplied

by municipalities***

MODEL PAPER- 1

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R-13

JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABADB.Tech I Year Examinations, June-2014



PART-A

1. Answer all the following questions (a-e: 2Marks; f-j: 3 Marks) Marks: 25a. Explain working of lead-acid batteryb. Write a short note on composition of cement. c. Write a short note on Break-point Chlorination d. Define Octane and cetane number. e. Give an account of the analytical applications of colloids f. Explain carbonate and non-carbonate hardness of water g. Differentiate Eutectic point from triple point h. Give an account of the classification of the fuels with suitable examples i. Write a short note on electroless (Ni) plating.

j. What is Vulcanization? Why is this carried out? PART-B


2. (a) What is reference electrode? Explain the functioning of standard calomel electrode and quinhydroneelectrode with Nernst equation.

(OR)(b) Write notes on the following:- (i) Hot dipping (ii) Galvanizing (iii) Tinning (iv) Electroplating.

3. a) Explain the terms chain and step-growth polymerizations with appropriate examples. (b) Describe the preparation, properties and uses of (i) PVC (ii) Bakelite (iii) Teflon

(OR)(c) Explain the following mechanisms with suitable illustrations. (i) Fluid film lubrication. (ii) Extreme

pressure lubrication. (iii) Boundary lubrication.

4. (a) Write a note on complex-metric titrations used for estimation of hardness of water by EDTA (b) A sample ofwater containing the following impurities. Calculate the quality of lime and soda required for purification of10,000 liters of water. Mg(HCO 3)2=73 mg, CaCl 2 = 222mg, MgSO 4 = 120 mg, NaCl = 58.5 mg.

(OR)(c) Differentiate between lime-soda and zeolite processes for softening of water giving merits and demeritsof the two processes (d) What is the principle involved in internal treatment of boiler feed water anddescribe various types of internal t reatment methods.

5. (a) Explain the following with suitable illustrations. (i) Refining / Sweetening of petrol (ii) Bergeousmethod of synthesis of petrol

(OR)

(b) How do you analyze flue gas by Orsat’s method? (c) Calculate the minimum amount of air required forcomplete combustion of 1kg of coal sample having the following compositions C = 80%, O = 8%, S = 2%,H = 5%, N = 1% and Ash = 4 %. Oxygen in air is 23% by weight.

6. (a) Explain two component systems by taking lead-silver system as an example. (b) What is meant by heattreatment of steel? Explain the different heat treatment processes carried out with relevant applications

(OR)(c) Outline the difference between physisorption and chemisorptions with examples (d) Explain Langmuiradsorption isotherm. What are the advantages and limitations of Langmuir adsorption theory?

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PART-A

1. Answer all the following questions (a-e: 2Marks; f-j: 3 Marks) Marks: 25a. Explain determination of PH using glass electrode.

b. Write a short note on Compression moulding.c. Write a short note on Knockingd. Write a short note on Sand filtration process.e. What is meant by a phase diagram f. Write a short note on Annealing. g. Write a short note on Galvanic cells.h. Discuss the corrosion in boilers.i. Write a short note on natural rubber.

j. Distinguish between Gross calorific value from net calorific value. PART-B


2. (a) Write a short note on Potentiometric titrations (b) Write a short note on Conductometric titrations(OR)

(c) Discuss the influence of following factors on corrosion:- i.Nature of the metal ii. Nature of environment.(d) Explain the nature and role of constituents of organic paints.

3. (a) What are conducting polymers? Write about the properties and applications of poly aniline and polyacetylene (b) What are fibers? Describe the preparation, properties and uses of (i) Dacron (ii) Nylon 66

(OR)(c) Write a brief account on the following: (i) Heat capacity of a refractory material. (ii) Porosity of arefractory material. (ii) Thermal expansion and contraction. (iv) Refractoriness (d) What are the differenttypes of preparation and applications of Nano materials?

4. (a) Describe the Lime-Soda process for softening of hard water with neat sketch. (b) One litre of water froman underground reservoir in Tirupathi Town in Andhra Pradesh showed the following analysis for itscontents: Mg(HCO 3)2 = 42 mg; Ca(HCO 3)2 = 146mg; CaC l 2 = 71mg; NaOH = 40mg; MgSO 4 = 48 mg;organic impurities = 100 mg; Calculate temporary, permanent and total hardness of this sample of water indegree French & Clark.

(OR)(c) Define and mention types of hardness? How is the hardness of water expressed? What are the variousunits employed? Explain their inter-conversion (d) Describe Potable water with specifications and discussvarious steps involved in treatment of potable water.

5. (a) What is cracking? Explain the different types of cracking processes along with their advantages. (b)Define Octane number of gasoline. What is its significance and how is it measured? Why ethylenedibromide is added when TEL is used as an antiknock reagent?

(OR)(c) With help of a neat diagram explain the construction and working of Junker's calorimeter for the analysisof gaseous fuels. (d) Write short notes on the following. (i) CNG (ii) Natural gas (iii) LPG.

6. (a) Deduce the expression F+P=C+2 and explain the terms involved with suitable illustrations and thesignificance of the terms involved. (b) Explain how iron-carbon phase diagram provides information aboutthe formation of different phases in iron-carbide system.

(OR)(c) What are colloids? How are they classified? (b) Differentiate the dispersed phase from dispersionmedium.(d) Explain Freundlich adsorption isotherm. What are the advantages and limitations of Freundlichadsorption theory.

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MODEL PAPER- 3




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PART-A

1.

Answer all the following questions (a-e: 2Marks; f-j: 3 Marks) Marks: 25a. Write a short note on Nernst equation.b. Explain the differences between thermoplastics and thermoset plastics. c. Write the structure of EDTA and the complex formed between Ca +2 , Mg +2 and EDTA. d. Give an account of the advantages and disadvantages of coal over gaseous fuels. e. Write a short note on triple point.f. How are metals protected by impressed current method? g. What are the properties of a good lubricant? h. What are scales? How are they formed in boilers? i. Explain HCV and LCV of fuels and how do they differ?

j. Write applications of adsorption.PART-B


2. (a) Differentiate primary, secondary cells with suitable examples. (b) Describe Lead-acid, Ni-Cd andLithium cells.

(OR)(c) Describe Types corrosion (d) Write a short note on Metal cladding & electroplating.

3. (a) What are plastics? Describe various moulding process of plastics. (b) describe mechanism andapplications of conducting polymers.

(OR)(c) describe the following properties of lubricants (i) Viscosity (ii) Cloud point, (iii) flash and fire points.(d) Define & Classify refractories and mention its applications.

4. (a) What is potable water? Mentions its specifications. (b) Write in detail an account on Disinfection ofwater by chlorination and ozonisation.

(OR)(c) How do you estimate temporary and permanent hardness of water by EDTA method? (d)One liter ofwater from an under ground reservoir in Nalgonda Town in Andhra Pradesh the following analysis. for itscontents:: Mg(HCO 3)2 = 146 mg; Ca(HCO 3)2 = 81 mg; MgSO 4 = 12 mg; CaSO 4 = 136 mg; NaCl = 585 mg;Organic impurities = 100 mg; Calculate temporary, permanent and total hardness of this sample of water indegree Clark and French.

5. (a) Give an account of the classification of the fuels with suitable examples. (b) Define Octane and cetanenumber of gasoline. What is its significance and how is it measured?

(OR)

(c) Write an account on the refining of petroleum by explaining the composition, boiling range and uses ofdifferent fractions obtained during refining.(d) Write short notes on the following. (i) CNG (ii) Natural gas.

6. (a) Define phase, component, degree of freedom and equilibrium with suitable examples. (b) Explain onecomponent system phase diagram with using one suitable example.

(OR)(c) What are colloids? How are they classified? Mention its various applications. (d) Differentiate thedispersed phase from dispersion medium.

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MODEL PAPER- 4


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Engg Chemistry R13 Model Question Papers