I B.Tech Semester Supplimentary Examinations, June 2009 APPLIED CHEMISTRY (Civil Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. Justify the following statements with suitable examples.
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(a) the rate of corrosion is dependant on the nature of the corroding environment. [8] (b) A pipe half buried in water undergoes corrosion fastly.
[8]
2. (a) (a) What is sacrificial anode ? Mention its role in control.
[8]
(b) How does the design and material selection help control metallic corrosion?[8]
or
3. (a) What are organic coatings. Give an account of the factors influencing the protective value of the coatings. [10] (b) Write an account on characteristics of a good varnish.
[6]
4. (a) Differentiate between thermoplastics and thermoset plastic materials.
[8] [8]
5. (a) Explain the processes of priming and foaming in boilers.
[7]
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(b) Outline the preparation, properties and uses of PVC.
(b) How can these be avoided ?
[4]
(c) Describe the hot lime-soda process for softening of hard water.
[5]
6. (a) Write a note on sterilization of drinking water.
[6] 0
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(b) Calculate the total hardness of a sample of water in F r and Clarke having the following salts: CaCl2 = 11.1 mg/litre; M gHCO3 )2 = 7.3 mg/litre; Mg(NO3 )2 = 14.8mg/litreandCa(HCO3 )2 = 8.1mg/litre . [10]
7. (a) Write briefly on any three types of common refractories.
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(b) How does porosity affect refractoriness of a refractory? (c) Summarize the important applications of thermal insulators.
8. (a) Compare fat lime with hydraulic lime. (b) Give an account of the different classes of hydraulic limes. ⋆⋆⋆⋆⋆
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[8] [4] [4] [8] [8]
Set No. 2
Code No: RR10104
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I B.Tech Semester Supplimentary Examinations, June 2009 APPLIED CHEMISTRY (Civil Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) What is Pilling-Bedworth rule?
[8]
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(b) Give an account of the corrosion by other gases and liquid metal corrosion.[8] 2. Write brief account on (a) Metal spraying.
[8]
(b) Corrosion inhibitors
[8]
or
3. Compare the following (a) Drying oils with semidrying oils
[5]
(b) Varnishes with emulsion paints
[6]
(c) Lacquers with enamels
[5]
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4. (a) Describe the free-radical polymerization of ethylene to polyethylene.
[6]
(b) Write a note on
i. Polymethyl methacrylate ii. Urea − Formaldehyde resins.
[5] [5]
5. (a) Define hardness of water. What are the types of hardness present in water.[6] (b) Name the different units of hardness and explain their interconversion.
[5]
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(c) What are the disadvantages of hard water when used for steam generation in boilers. [5]
6. (a) What is break-point chlorination ? What is its importance ?
[8]
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(b) A sample of M gSO4 .7H2 O was dissolved in water to make up one litre of the solution. 20ml of this solution, when titrated volumetrically required 20ml of 0.2 M standard EDTA solution using EBT indicator. Determine the hardness of this solution in terms of CaCO3 in ppm units. [8]
7. (a) What are refractories ? Summarize their important characteristics. (b) Write a note on “askarels”.
[10] [6]
8. Give an account of the following properties of lime. (a) Slaking (b) Setting and hardening of lime. 1 of 2
I B.Tech Semester Supplimentary Examinations, June 2009 APPLIED CHEMISTRY (Civil Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. Explain the mechanism of corrosion when
(b) A metal exposed to varying aeration.
[8]
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(a) Two dissimilar metals are connected and exposed to electrolyte
[8]
2. Explain how corrosion control can be brought by the following methods (a) Proper designing
[5]
(c) Use of inhibitors
[5]
or
(b) Modifying the environment
[6]
3. Give an account of the following by mentioning their advantages in the prevention of corrosion.
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(a) Vitreous enamels (b) Ceramics.
[8] [8]
4. Discuss the preparation, properties and uses of (a) LDPE
[5]
(b) HDPE and
[6]
(c) LLDPE
[5]
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5. (a) Describe a method for estimating temporary hardness of water using Hehner’s procedure. [8] (b) Outline the EDTA method for determining the permanent hardness of water. [8]
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6. (a) Explain the term “municipal water”. (b) Summarize the treatment processes used to obtain municipal water.
[4] [4]
(c) Calculate the lime and soda in Kgs required to soften 30,000 litres of water containing CaSO4 = 136 ppm, M gCl2 = 95 ppm, Ca(HCO3 )2 = 162 ppm & Mg(HCO3 )2 = 73 ppm. [8]
7. (a) Outline the important characteristics of refractories.
[8]
(b) Differentiate between the different types of insulating materials.
[4]
(c) Explain the use of silicone fluids as insulating materials.
[4]
1 of 2
Set No. 3
Code No: RR10104
8. Give an account of the raw materials use din the manufacture of the lime and explain the manufacture of lime and explain the manufacture of fat lime. [16]
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⋆⋆⋆⋆⋆
2 of 2
Set No. 4
Code No: RR10104
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I B.Tech Semester Supplimentary Examinations, June 2009 APPLIED CHEMISTRY (Civil Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. Explain the mechanism of corrosion when
(b) A metal exposed to varying aeration. 2. Write brief account on (a) Metal spraying.
[8]
ld .
(a) Two dissimilar metals are connected and exposed to electrolyte
[8]
[8] [8]
or
(b) Corrosion inhibitors 3. Write the characteristics of the following (a) Enamels. (b) A good paint.
[8] [8]
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4. (a) What is the difference between “free radical” and “ionic” addition polymerization? [6] (b) Write a note on preparation, properties and uses of i. Bakelite ii. Urea − Formaldehyde resins
[5] [5]
5. (a) Describe the Hehners method for estimating temporary hardness of water. [8]
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(b) Outline the Zeolite Process for softening of hard water.
[8]
6. (a) Describe, in brief, the EDTA method to determine the calcium hardness of water. [8]
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(b) Calculate the total hardness of a sample of water in 0 F r and 0 Clarke which showed the following contents:[8] Ca(HCO3 )2 = 16.2 mg/litre; M gCl2 = 9.5 mg/litre; CaSO4 = 13.6 mg/litre; Mg(HCO3 )2 = 14.6 mg/litre; Organic matter = 12.5 mg/litre; NaCl = 5.85 mg/litre.
7. (a) Write notes on:
[8]-
i. magnesible bricks ii. chromite bricks. (b) How do you classify insulators ? Explain your answer with appropriate examples. [8] 1 of 2
Set No. 4
Code No: RR10104 8. Write short notes on:(a) Heat of hydration of cement.
[10] · (b) Write a note on âaskarelsâ. [6]. 8. Give an account of the following properties of lime. [4x4=16]. (a) Slaking. (b) Setting and hardening of lime. 1 of 2.
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PLANT BIO-TECHNOLOGY ... 1. Discuss the importance of Plant tissue culture in India? [16] ... 7. What is meant by disease resistance and Susceptibility? [8+8].
(a) What are the factors that lead to fading and attenuation in ionospheric prop- agation. (b) What is the wave tilt and how does it effect the field strength received ...
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