Set No. 1
Code No: 07A1BS04
I B.Tech Regular Examinations, May/Jun 2008 APPLIED CHEMISTRY (Civil Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. Distinguish the following: (a) (b) (c) (d)
[4+4+4+4]
Hard water and soft water carbonate and non-carbonate hardness mg/litre and ppm Sedimentation and filtration.
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) 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. Explain in detail the various methods of Chemical conversion coatings.
[16]
5. (a) How will you synthesis nylon 6,6 from 1,3 butadiene? (b) Describe the method of preparation of polyester and mention its properties and uses. (c) What is the repeating unit of [6+6+4] i. natural rubber ii. Teflon. 6. (a) Write short notes on i. Thermal spalling ii. Refractoriness under load. (b) Describe the preparation, properties and uses of silica refractory bricks. [8+8] 7. (a) Give the functions of lubricants. (b) Describe the mechanism of extreme pressure lubrication. (c) How a viscous lubricant is converted into grease?
[6+4+6]
8. What are the chemical constituents of Cement? Discuss the function of each constituent. [16] ⋆⋆⋆⋆⋆ 1 of 1
Set No. 2
Code No: 07A1BS04
I B.Tech Regular Examinations, May/Jun 2008 APPLIED CHEMISTRY (Civil Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. Write short notes on the following:
[4+4+4+4]
(a) Units of hardness of water (b) Break point chlorination (c) Filtration of water (d) Impurities in water. 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) 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) Write short notes on chromizing (b) How pH of an electrolyte affects electrodeposit? (c) Explain the method of coating for protection of furnace parts.
[6+4+6]
5. (a) Differentiate between elastomer and plastic. (b) Which rubbers are used in the preparation of automobile parts? Discuss their manufacture and vulcanization. [6+10] 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) What are synthetic lubricants? How they are superior to petroleum based lubricants? (b) Define Grease? Under what conditions they are used as lubricants? (c) What is the effect of temperature on viscosity? Explain with an example. [6+6+4] 1 of 2
Set No. 2
Code No: 07A1BS04
8. What are the chemical constituents of Cement? Discuss the function of each constituent. [16] ⋆⋆⋆⋆⋆
2 of 2
Set No. 3
Code No: 07A1BS04
I B.Tech Regular Examinations, May/Jun 2008 APPLIED CHEMISTRY (Civil Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. Distinguish the following: (a) (b) (c) (d)
[4+4+4+4]
Hard water and soft water carbonate and non-carbonate hardness mg/litre and ppm Sedimentation and filtration.
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) 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) List the differences between anodic coating and cathodic coating. (b) How zinc coated on iron prevents corrosion? (c) Explain sand blasting method of surface preparation? 5. (a) Differentiate between LDPE & HDPE. (b) What are the drawbacks of raw rubber? (c) Write the repeating unit for the following: i. Nylon 6,6 ii. PVC.
[8+4+4]
[4+8+4]
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) What is meant by blended oils? Explain the functions of various additives added to the lubricants? (b) What are viscosity & viscosity index of lubricating oil? [12+4] 8. (a) Discuss the chemical and physical changes that occur during the setting of cement with relevant chemical equetions.. (b) Write a note on decay of cement concrete and its prevention. [10+6] ⋆⋆⋆⋆⋆ 1 of 1
Set No. 4
Code No: 07A1BS04
I B.Tech Regular Examinations, May/Jun 2008 APPLIED CHEMISTRY (Civil Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. Discuss briefly the following:
[8+8]
(a) Estimation of hardness of water (b) Dis-infection of water. 2. Write short notes on:
[8+8]
(a) Ion-exchange method (b) Scales and Sludges. 3. (a) Explain the following factors influencing the rate of corrosion. i. Nature of corrosion product ii. Position in electrochemical series iii. pH. (b) Differentiate between dry corrosion and wet corrosion.
[8+8]
4. (a) Explain the following: i. Alkali Cleaning ii. Mechanical cleaning. (b) Describe the principles involved in electro plating. (c) Anodized coating is preferred for Aluminium - Give Reasons.
[8+4+4]
5. (a) Differentiate between elastomer and plastic. (b) Which rubbers are used in the preparation of automobile parts? Discuss their manufacture and vulcanization. [6+10] 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) What is meant by blended oils? Explain the functions of various additives added to the lubricants? (b) What are viscosity & viscosity index of lubricating oil?
[12+4]
8. What are the chemical constituents of Cement? Discuss the function of each constituent. [16] ⋆⋆⋆⋆⋆ 1 of 1