i b.tech semester supplimentary examinations, june...

Code No: R05010301 Set No. 1

I B.Tech Semester Supplimentary Examinations, June 2009ENGINEERING CHEMISTRY

( Common to Mechanical Engineering, Mechatronics, ProductionEngineering and Automobile Engineering)

Time: 3 hours Max Marks: 80Answer any FIVE Questions

All Questions carry equal marks⋆ ⋆ ⋆ ⋆ ⋆

1. Give an account of the various methods involved in the treatment of potable water.[16]

2. (a) Explain the cold lime soda process and hot lime soda process. What are theadvantages of lime soda process?

(b) 100 ml of a water sample contains hardness equivalent to 25 ml of 0.08 NMgSO4. [8+8]

i. What is the hardness of water sample in ppm?

ii. What is the amount of lime and soda required for the treatment of thewater sample?

3. Write short notes on the following:

(a) Cathodic protection

(b) Caustic embrittlement corrosion. [8+8]

4. Discuss the following: [16]

(a) Galvanization

(b) Cementation

(c) Chromizing.

5. (a) Identify the thermo sets and thermoplastics among the following:

i. PVC.

ii. Polyethylene.

iii. Silicone.

iv. Polyester fibre.

v. Bakelite.

(b) What is bakelite? How is it manufactured and mention its uses? [5+11]

6. (a) Bring out the differences between fluid film and boundary lubrications.

(b) What is online point? Mention its significance.

(c) Write a short note on thin-film lubrication. [5+5+6]

7. (a) What is meant by the term lubrication ?

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(b) Define the following:

i. lubricant

ii. Friction

iii. Seizure.

(c) What is surface roughness, surface attraction and surface energy? [2+8+6]

8. (a) Explain the recovery of by-product from ‘Coke oven gas’

(b) Give the comparison between solid, liquid and gaseous fuels. [8+8]

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1. (a) What is meant by carbonate and non-carbonate hardness of water?

(b) Explain why hard water does not produce leather with soap?

(c) A sample of hard water contains the following dissolved solids per litre.Ca(HCO3)2 =16.4 mgs, Mg(HCO3)2 = 14.6 mgs, CaCl2 = 111 mgs,MgSO4 = 12 mgs, CO2 = 44 mgs and CaSO4 =13.6 mgs. Calculate temporaryand permanent hardness of water in ppm and in degree clank. [6+4+6]

2. Explain the basic principle, different methods, advantages and disadvantages oflime-soda process. [16]

3. Explain how corrosion control can be brought about by the following methods.

(a) Modifying the environment

(b) Cathodic protection. [8+8]

4. Explain the following terms: [16]

(a) Drying oil

(b) Thinners

(c) Driers

(d) Fillers.

5. (a) What are heterochain polymers? Give examples.

(b) What are Antioxidants? How are they useful in compounding of resins?

(c) Write a note on Buna- N Rubber. [4+6+6]

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

7. Describe the various types of lubrication. [16]

8. (a) Define a Fuel? How chemical fuels are classified and give examples for each.

(b) What is meant by Calorific value of a fuel? Define calorie and kilocalorie.[10+6]

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1. (a) What is meant by carbonate and non-carbonate hardness of water?

(b) Explain why hard water does not produce leather with soap?

(c) A sample of hard water contains the following dissolved solids per litre.Ca(HCO3)2 =16.4 mgs, Mg(HCO3)2 = 14.6 mgs, CaCl2 = 111 mgs,MgSO4 = 12 mgs, CO2 = 44 mgs and CaSO4 =13.6 mgs. Calculate temporaryand permanent hardness of water in ppm and in degree clank. [6+4+6]

2. Write short notes on the following: [16]

(a) Colloidal conditioning

(b) Sodium aluminate condition

(c) Calgon conditioning

(d) Carbonate conditioning.

3. Give an account of any eight factors that influence the rates of corrosion. [16]

4. Write note on: [16]

(a) Phosphate coatings

(b) Chemical oxide coatings

(c) Anodized coatings.

5. (a) What is PVC? How is it prepared? Write the engineering application of PVC.

(b) Write preparation, properties and uses of phenol formaldehyde resins. [8+8]

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

7. (a) What are the functions of lubricants?

(b) Write a note on extreme pressure lubrication. [8+8]

8. (a) Define a Fuel? How chemical fuels are classified and give examples for each.

(b) What is meant by Calorific value of a fuel? Define calorie and kilocalorie.[10+6]

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1. (a) What is hardness of water? How do you express the hardness? What are theunits to express the hardness?

(b) Give an account of the disadvantages of hard water. [8+8]

2. (a) What is meant by desalination? What is its significance?

(b) Explain the different methods used for the desalination of brackish water.[4+12]

3. (a) Give an account of the various factors which influence the rate of corrosion.

(b) Write a brief account on pilling-bedworth rule. [8+8]

4. Explain the following terms: [16]

(a) Drying oil

(b) Thinners

(c) Driers

(d) Fillers.

5. (a) What is Nylon and how is it prepared?

(b) Explain any one of the mechanism of addition polymerization. Using a suitableexample.

(c) Describe the important uses of PVC. [6+6+4]

6. (a) Define flash and fire points.

(b) Discuss the important functions of lubricants. [16]

7. (a) What is meant by the term lubrication ?

(b) Define the following:

i. lubricant

ii. Friction

iii. Seizure.

(c) What is surface roughness, surface attraction and surface energy? [2+8+6]

8. (a) What is Transportation theory? Explain?

(b) What is coal? How it is formed?

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(c) Explain the classification of coal. [3+4+9]

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