R05010104-applied-chemistry

Set No. 1

Code No: R05010104

I B.Tech Supplimentary Examinations, Aug/Sep 2008 APPLIED CHEMISTRY (Civil Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) What are the important sources of water ? (b) What is the cause for alkalinity of natural water? (c) How do you estimate the hardness of water by EDTA?

[4+3+9]

2. (a) Compare the ion-exchange process with lime-soda process for softening of hard water. (b) A sample of water obtained from Karimnagar showed the following analysis: CaCl2 = 11.1 ppm; Mg(NO3 )2 = 14.8 ppm; MgSO4 = 12 ppm; Ca(HCO3 )2 = 16.2 ppm; KCl = 7.45ppm. Calculate lime-soda required to soften (In Kgs) 5000 liters of water. [8+8] 3. (a) What is corrosion? How is it different from erosion? Explain the term passivity with suitable examples. (b) Give an account of the oxidation corrosion with relevant chemical equations involved. [8+8] 4. Give an account of any eight characteristics of a good electrodeposition?

[16]

5. (a) What are silicone resins ? How are they made and what are their uses? (b) Discuss the preparation, properties and uses of bakelite resins.

[8+8]

6. (a) Explain i. the Segar Cones test ii. Refractoriness Under Load test. (b) Outline the important applications of refractories.

[8+8]

7. (a) Define and classify lubricants? (b) What are the chemical and physical tests for lubricants? 8. Explain the hardening and setting of cement using the chemical equations. ⋆⋆⋆⋆⋆

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[4+12] [16]

Set No. 2

Code No: R05010104

I B.Tech Supplimentary Examinations, Aug/Sep 2008 APPLIED CHEMISTRY (Civil Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Describe in brief, the EDTA method to determine the calcium hardness of water. (b) Calculate the total hardness of a sample of water in o Fr and o Cl which showed the following analysis in ppm: Ca(HCO3 )2 = 162; MgCl2 = 9.5; CaSO4 = 13.6; Mg(HCO3 )2 = 14.6; Organic matter = 12.5; NaCl = 5.85. [8+8] 2. (a) Explain the scale and sludge formation in boilers. (b) Calculate amount of lime (80%) and soda ( 90%) required to soften 12,000 litres of the water containing the following salts: CaCO3 = 185 ppm; CaSO4 = 34 ppm; MgCl2 = 76 ppm; organic matter = 84 ppm; SiO2 = 12ppm; Ca(HCO3 )2 = 220 ppm. [8+8] 3. Give reasons for the following statements. (a) Water filled steel tank corrodes below the water line. (b) A steel screw in a brass marine hardware corrodes fastly. 4. Explain the following what happens and why it is happens

[8+8] [4x4=16]

(a) When a zinc plate is attached below a ship. (b) When steel is alloyed with chromium homogeneously. (c) When there are crevices between the adjacent parts of the structure. (d) When there is no uniform flow of a corrosion liquid. 5. (a) Explain the difference between thermoplastics and thermoset plastics. (b) Outline the preparation, properties and uses of bakelite. 6. (a) How do you measure

[8+8] [8]

i. thermal stability and ii. strength of a refractory material ? Describe suitable tests to measure them. (b) Write a note on liquid insulating materials. 7. (a) What are the important functions of lubricants?

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[8]

Set No. 2

Code No: R05010104

(b) A lubricating oil has a Say bolt universal viscosity of 59 seconds at 21 00 F and 560 seconds at 10 00 F. The low viscosity index standard Gulf oil has Say bolt universal viscosity of 59 seconds at 2100 F and 760 seconds at 10 00 F. The high viscosity index standard Pennsylvanian oil gave the Say bolt universal viscosity value 59 seconds at 21 00 F and 460 seconds at 10 00 F. Find the viscosity index of lubricating oil. [8+8] 8. (a) What is Portland cement? Why is it so named? (b) Explain the different ingredients of cement. ⋆⋆⋆⋆⋆

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[8+8]

Set No. 3

Code No: R05010104

I B.Tech Supplimentary Examinations, Aug/Sep 2008 APPLIED CHEMISTRY (Civil Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) What do you understand by “potable water”. (b) Discuss the phenomenon of break point chlorination. (c) Calculate the concentration in moles/liter of CaCl2 solution if its hardness was found to be 100 ppm. [6+4+6] 2. (a) What are soaps? (b) What happens when soap is treated with hard water? (c) Describe the ion-exchange process for softening of hard water.

[3+4+9]

3. (a) What is corrosion? How is it different from erosion? Explain the term passivity with suitable examples. (b) Give an account of the oxidation corrosion with relevant chemical equations involved. [8+8] 4. Give an account of any eight characteristics of a good electrodeposition?

[16]

5. (a) What is Crepe rubber and how is it made? (b) Describe the preparation, properties and uses of i. Thiokol rubber ii. Neoprene rubber.

[6+6+4]

6. (a) Describe a general method to manufacture refractories. (b) Outline their importance & applications. (c) Write a note on askarels.

[4+8+4]

7. Write short notes on: (a) Flash and fire points (b) Cloud and pour point (c) Carbon residue.

[5+5+6]

8. With the help of flow diagram explain the manufacture of Portland cement by wet process. [16] ⋆⋆⋆⋆⋆

1 of 1

Set No. 4

Code No: R05010104

I B.Tech Supplimentary Examinations, Aug/Sep 2008 APPLIED CHEMISTRY (Civil Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) What are the important sources of water? (b) Why rain water is the purest form of natural water? (c) Calculate the temporary, permanent and total hardness in ppm units of a sample of water containing the following salts: Mg(HCo3 )2 = 14.6 mg/litre; Ca(HCo3 )2 = 16.2 mg/litre; MgCl = 9.5 mg/litre; CaSO4 = 13.6 mg/litre; NaCl = 5.85 mg/litre; suspended impurities = 5.5 mg/litre. [4+2+10] 2. (a) Describe the Permutit process for the softening of hard water. (b) Calculate the quantities in Kgs of lime-soda needed to soften 30,000 litres of water having the following composition salts: NaCl = 5.85 mg/liter; KCl = 7.45 mg/litre; Ca(HCO3 )2 = 40.5 mg/litre; Mg(HCO3 )2 = 14.6 mg/litre; Mg(NO3 )2 =14.8 mg/litre; CaCl2 =22.2 mg/litre. Determine the quantities (in Kgs) of lime and soda required for softening 10,000 liters of water. [8+8] 3. (a) How do you differentiate dry corrosion from wet corrosion? (b) Explain Pilling-Bedworth rule with suitable examples.

[8+8]

4. (a) What is the process for chromium plating? Explain the main objectives and uses. Give reasons why chromium plating has nickel undercoat. (b) Write a brief account on sherardizing.

[10+6]

5. (a) Describe the composition of natural rubber. (b) Explain the difference between natural and synthetic rubber (c) Write briefly on the compounding of rubber for engineering uses.

[4+6+6]

6. (a) Classify refractories giving suitable examples. (b) Explain the importance of various gaseous insulators. (c) Write briefly on liquid insulating materials.

[6+4+6]

7. (a) Outline the important functions of lubricants. (b) Explain the mechanism of thick film lubrication.

[8+8]

8. (a) Give an account of the functions of the ingredients of cement. (b) How is Portland cement manufactured by dry process? ⋆⋆⋆⋆⋆

1 of 1

[6+10]