Set No. 1
Code No: RR10301
I B.Tech Supplimentary Examinations, February 2008 ENGINEERING CHEMISTRY ( Common to Mechanical Engineering, Mechatronics, Production Engineering, Aeronautical Engineering and Automobile Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks \ u 2 2 c 6 \ u 2 2 c 6 \ u 2 2 c 6 \ u 2 2 c 6 \ u 2 2 c 6
1. (a) Name the di\ufb00erent ingredients present in paints. (b) Explain why stainless steel is resistant to atmospheric corrosion. (c) Distinguish between di\ufb00erential aeration corrosion and di\ufb00erential rosion. [5+6+5] 2. (a) How is PVC prepared and what are its uses?
(b) Write down the di\ufb00erences between compression and injection moulding niques. (c) How is Thiokol prepared? Mention its uses.
[4+6+6]
3. (a) What is meant by \u201chardness\u201d of water? (b) What are the major disadvantages of hard water when used for i. domestic purposes. ii. industrial purposes and iii. steam generation in boilers?
[4+12]
4. Calculate the amount of soda and lime required to soften 15,000 lit of water wh showed the following analysis. NaCl= 15.5 ppm, KCl = 25 ppm, CO2 = 5.5 ppm, Mg SO4 = 120 ppm, CaCl2 = 22ppm, Ca(HCO3 )2 = 15ppm, Mg (HCO3 )2 = 3.30 ppm, Suspended matter =15 [16] ppm, Organic impurities = 35 ppm. 5. (a) What are the characteristics of liquid fuels? (b) Write note on: i. octane number. ii. Thermal cracking.
[8+8]
6. (a) With a neat diagram describe the orsat gas analysis method. What are the special precaution to be taken in the measurement .
(b) De\ufb01ne calori\ufb01c values of a fuel. Distinguish gross and net calori\ufb
7. What are Refractories? Explain Thermal spalling, strength and porosity of the refractories. [16]
8. Write a note on lubricants with special reference to their classi\ufb01cation, m action, examples and applications. [16] 1 of 2
Set No. 1
Code No: RR10301
\ u 2 2 c 6 \ u 2 2 c 6 \ u 2 2 c 6 \ u 2 2 c 6 \ u 2 2 c 6
2 of 2
Set No. 2
Code No: RR10301
I B.Tech Supplimentary Examinations, February 2008 ENGINEERING CHEMISTRY ( Common to Mechanical Engineering, Mechatronics, Production Engineering, Aeronautical Engineering and Automobile Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks \ u 2 2 c 6 \ u 2 2 c 6 \ u 2 2 c 6 \ u 2 2 c 6 \ u 2 2 c 6
1. (a) What is a drying oil? Give two examples. (b) Compare the uniform corrosion and pitting corrosion. (c) Explain Sacri\ufb01cial anode method in detail.
[5+6+5]
2. (a) What is Nylon and how is it prepared?
(b) Explain any one of the mechanism of addition polymerization. Using a suitable example. (c) Describe the important uses of PVC.
[6+6+4]
3. (a) Describe the principle and procedure involved in the zeolite process used f the treatment of water.
(b) What are the advantages and disadvantages of Zeolite process over lime-sod process? [8+8] 4. Determine the total hardness of a sample of water in 0 Fr and 0 Clarke which showed the following analysis :- Suspended matter = 100 mg; Ca(NO3 )2 = 16.4 mg/litre; MgSO4 = 24 mg/litre; MgCl2 = 19 mg/litre; NaOH = 40 mg/litre; KOH = 56 [16] mg/litre ( At. Masses of Na = 23, Mg = 24, K = 39 and Ca = 40.) 5. (a) What is coal? How it is formed? Discuss the qualities of a good coal. (b) Give the Classi\ufb01cation of coal and explain each class [8+8] with example.
6. (a) With a neat diagram describe the orsat gas analysis method. What are the special precaution to be taken in the measurement .
(b) De\ufb01ne calori\ufb01c values of a fuel. Distinguish gross and net calori\ufb
7. (a) How are the refractories are classi\ufb01ed? Give one example for each clas
(b) Write a note on the conditions leading to failure of a refractory material. [8+8 8. Explain the following two theories for the mechanism of the lubricants. (a) Boundary lubrication (b) Extreme pressure lubrication. \ u 2 2 c 6 \ u 2 2 c 6 \ u 2 2 c 6 \ u 2 2 c 6 \ u 2 2 c 6
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[8+8]
Set No. 3
Code No: RR10301
I B.Tech Supplimentary Examinations, February 2008 ENGINEERING CHEMISTRY ( Common to Mechanical Engineering, Mechatronics, Production Engineering, Aeronautical Engineering and Automobile Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆ ⋆ ⋆ ⋆ ⋆
1. (a) Describe the cathodic protection of corrosion control (b) Write a note on Electroplating.
[8+8]
2. (a) Identify the thermo sets and thermoplastics among the following: i. ii. iii. iv. v.
PVC. Polyethylene. Silicone. Polyester fibre. Bakelite.
(b) What is bakelite? How is it manufactured and mention its[5+11] uses? 3. (a) Describe the Zeolite process used for softening of water?
(b) Compare the advantages and disadvantages of permutit process with those o lime-soda process. [8+8] 4. Determine the amount of soda and lime required in Kg’s to soften 5000 lit of water containing the following salts MgCl2 = 15.5 ppm, Ca(Hco3 )2 = 32.5 ppm, Ca(No3 )2 [16] = 22.4 ppm, NaCl = 50 ppm, KCl = 22.5 ppm. 5. (a) How is coal is graded? Explain what is calorific value of coal. (b) Give the advantages and disadvantages of Coal over gaseous [8+8] fuels.
6. (a) Discuss in detail Bergius procedure for the manufacture of synthetic petrol. (b) What are the characteristics of a good Fuel?
[8+8]
7. What are Refractories? Explain Thermal spalling, strength and porosity of the refractories. [16] 8. Define lubricant. Discuss the important properties of the lubricating [16] oils. ⋆ ⋆ ⋆ ⋆ ⋆
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Set No. 4
Code No: RR10301
I B.Tech Supplimentary Examinations, February 2008 ENGINEERING CHEMISTRY ( Common to Mechanical Engineering, Mechatronics, Production Engineering, Aeronautical Engineering and Automobile Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆ ⋆ ⋆ ⋆ ⋆
1. (a) What is a drying oil? Give two examples. (b) Compare the uniform corrosion and pitting corrosion. (c) Explain Sacrificial anode method in detail.
[5+6+5]
2. (a) Write down any two distinguishing features of PVC. (b) Explain the differences between thermo set and thermo plastics. (c) What is moulding of plastics? Explain compression moulding technique in detail. [5+5+6] 3. (a) Explain the different steps used in the purification of drinking water. (b) Discuss the EDTA method for the determination of permanent hardness of water. [8+8] 4. Calculate the temporary, permanent and total hardness in mg/litre of a sample of water containing the following salts :- Mg(HCO3 )2 = 14.6mg/litre; Ca(HCO3 )2 = 16.2 mg/litre MgCl2 = 9.5mg/litre; CaSO4 = 13.6 mg/litre ( Assume the atomic [16] mass of Ca to be 40 and that of Mg to be 24).
5. (a) What is octane number? Explain how the molecular structure will affect the octane number. (b) What is leaded petrol? Discuss its advantages and disadvantages. (c) Describe the fractional distillation of petroleum.
[6+5+5]
6. (a) With a neat diagram describe the orsat gas analysis method. What are the special precaution to be taken in the measurement .
(b) Define calorific values of a fuel. Distinguish gross and net calorific value. [8+
7. What are electrical insulators? Describe the characteristics and engineering app cations of these materials. [16] 8. Define lubricant. Discuss the important properties of the lubricating [16] oils. ⋆ ⋆ ⋆ ⋆ ⋆
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