07a1bs04-applied-chemistry

Set No. 1

Code No: 07A1BS04

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 is the principle of EDTA method? Explain the estimation of hardness of water by complexometric method. (b) Mention the dis-advantages of using hard water for industrial purpose. [12+4] 2. Distinguish between the following:

[6+6+4]

(a) Scales and Sludges (b) Soft water and demineralised water. (c) Lime soda process and demineralization of water. 3. (a) Elucidate the various steps that can be taken to minimize corrosion. (b) Give suitable reasons: i. Zn-plate fixed below the ship made of iron ii. Metal under water drop undergoes accelerated corrosion.

[8+8]

4. (a) What is meant by metal cladding? How it is done on the base metal? (b) Compare phosphate coating and chromate coating. (c) What are the objectives of electroplating on metals?

[6+6+4]

5. Write preparation, properties and use of (a) phenol-formaldehyde resins (b) silicone rubber.

[16]

6. (a) Give the criteria of a good refractory. (b) Write short notes on: i. Thermocole ii. Glass Wool iii. Asbestos.

[6+10]

7. Explain the various mechanisms of lubrication in detail?

[16]

8. What are the chemical constituents of Cement? Discuss the function of each constituent. [16] ⋆⋆⋆⋆⋆

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Set No. 2

Code No: 07A1BS04

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. Write a short note on the following:

[4+6+6]

(a) Ozonization (b) caustic embrittlement (c) zeoliite softners. 2. Write short notes on :

[5+6+5]

(a) Priming and Foaming (b) Phosphate conditioning (c) Caustic embrittlement. 3. (a) What is meant by passivation? How passive oxide film is superior than natural oxide film for controlling corrosion? (b) Give suitable reasons: i. Zn gets corroded vigorously when connected with Cu than with Fe ii. Copper equipment should not possess a small steel bolt iii. Small anodic area results in intense local corrosion. [8+8] 4. (a) What is cementation? Explain the various types of cementation process? (b) Why galvanization of iron is preferred to tinning?

[12+4]

5. (a) Differentiate between LDPE & HDPE. (b) What are the drawbacks of raw rubber? (c) Write the repeating unit for the following:

[4+8+4]

i. Nylon 6,6 ii. PVC. 6. (a) What is a refractory material? Explain the differences between acidic and basic refractories? (b) Explain the following properties as applied to refractory materials i. ii. iii. iv.

Refractoriness Refractoriness under load Thermal spalling. Porosity.

[4+12] 1 of 2

Set No. 2

Code No: 07A1BS04 7. (a) Give the functions of lubricants.

(b) Describe the mechanism of extreme pressure lubrication. (c) How a viscous lubricant is converted into grease? 8. Write short notes on:

[6+4+6] [16]

(a) Soundness test (b) Compressive strength test (c) White Cement (d) Acid-resistant Cement. ⋆⋆⋆⋆⋆

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Set No. 3

Code No: 07A1BS04

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. What are the specifications of potable water? Discuss the various steps involved in the treatment of water for domestic purpose. [16] 2. (a) Discuss the disadvantages of using hard water for various industries. (b) Explain the factors responsible for the corrosion of a boiler. Discuss the measures for its prevention. [8+8] 3. (a) What is oxidation corrosion and how does it take place? Describe the mechanism of oxidation corrosion. (b) Describe the various factors influencing the rate of chemical corrosion. [8+8] 4. (a) What is meant by acid pickling? What are its uses? (b) Explain the two methods by which metal spraying is applied?(c) Distinguish between galvanizing and tinning?

[4+6+6]

5. Explain how the polymers are classified on the basis of their thermal behaviour and method of polymerization. Give one example for each class. [16] 6. (a) Define Refractories and what are the criteria of a good refractory? (b) Give the classification of refractories with suitable examples.

[6+10]

7. (a) Distinguish between extreme pressure lubrication & boundary lubrication. (b) Describe the functions of viscosity index improvers? Give examples. (c) In what situations semi-solid lubricants are preferred. 8. Write short notes on:

[8+4+4] [16]

(a) Raw materials for cement (b) Soundness Test (c) Tensile Strength Test (d) Compressive Strength Test. ⋆⋆⋆⋆⋆

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Set No. 4

Code No: 07A1BS04

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. Write a short note on the following:

[4+6+6]

(a) Ozonization (b) caustic embrittlement (c) zeoliite softners. 2. (a) What are boiler scales? How their composition effects the boiler? What are their ill effects? Discuss the measures for their prevention. (b) Compare the lime soda process with zeolite process of water softening. [8+8] 3. (a) Describe how electrochemical properties are used in protecting submerged metals from being corroded. (b) Explain the corrosion of iron by dilute mineral acids.

[8+8]

4. (a) Discuss how the surface of a metal is prepared prior to the application of a protective coating. (b) Write the important applications of protective coating. (c) Why is moderate current density employed during electroplating? [10+4+2] 5. (a) Explain condensation polymerization with suitable example. (b) What is meant by compounding of rubber and explain the functions of various ingredients with examples. [6+10] 6. (a) What is pyrometric cone equivalent? How it is be determined for a refractory? What is it significance? (b) Write a very short notes on: i. ii. iii. iv.

[6+10]

Porosity Thermal Conductivity Dimensional Stability Strength.

7. (a) Distinguish between extreme pressure lubrication & boundary lubrication. (b) Describe the functions of viscosity index improvers? Give examples. (c) In what situations semi-solid lubricants are preferred. 8. Write short notes on:

[8+4+4] [16]

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Set No. 4

Code No: 07A1BS04 (a) Soundness test (b) Compressive strength test (c) White Cement (d) Acid-resistant Cement. ⋆⋆⋆⋆⋆

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