Ranchi University 2010 B.Tech Civil Engineering I Regular s, APPLIED CHEMISTRY ( - Question Paper

Code No: Y0121/R07 Set No. 1
I B.Tech Regular Examinations, May 2010
APPLIED CHEMISTRY
(Civil Engineering)
Time: three hours Max Marks: 80
ans any 5 ques.
All ques. carry equal marks
? ? ? ? ?
1. Write a short notes on the following: [4+4+4+4]
(a) Break - point chlorination
(b) Dissolved oxygen
(c) Hardness of water
(d) Sedimentation and coagulation.
2. (a) Water having subsequent composition to be softened by lime soda process
Ca(HCO3)2 = 220 ppm, Mg(HCO3)2 = 56ppm, MgCl2 = 130ppm, MgSO4 =
84ppm, CaSO4=98ppm, compute the amount of lime and soda needed to
soften 106 litres of water.
(b) discuss scale formation and sludge formation in boilers. elaborate their dis-
advantages? How are they removed? [8+8]
3. (a) discuss the subsequent factors influencing the rate of corrosion.
i. Nature of corrosion product
ii. Position in electrochemical series
iii. pH.
(b) Differentiate ranging from dry corrosion and wet corrosion. [8+8]
4. (a) explain 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) Differentiate ranging from elastomer and plastic.
(b) Which rubbers are used in the preparation of automobile parts? explain their
manufacture and vulcanization. [6+10]
6. (a) describe Refractories and elaborate the criteria of a good refractory?
(b) provide the classification of refractories with suitable examples.
[6+10]
7. (a) elaborate synthetic lubricants? How they are superior to petroleum based
lubricants?
(b) describe Grease? Under what conditions they are used as lubricants?
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Code No: Y0121/R07 Set No. 1
(c) What is the effect of temperature on viscosity? discuss with an example.
[6+6+4]
8. (a) Detail out the setting and hardening of Cement, with relevant chemical equa-
tions.
(b) Compare the setting of cement with relevant lime mortar.

Earning:   Approval pending.