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27438878-r05010104-Applied-Chemistry - Code.No 31001 R05...

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R05 SET-1 Code.No: 31001 JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD I .B.TECH –SUPPLEMENTARY EXAMINATIONS JANUARY- 2010 APPLIED CHEMISTRY (CIVIL ENGINEERING) Time: 3hours Max.Marks:80 Answer any FIVE questions All questions carry equal marks - - - 1.a) Explain the processes of “addition” and “condensation” polymerizations giving examples. b) Describe the preparation, properties and uses of i) LDPe ii) HDPE i i i ) L L D P E . [ 8 + 8 ] 2.a) Discuss the preparation, properties and applications of i) Polyurethane rubber and ii) Silicone rubber. b) What are the criteria of a good refractory material? Write about the applications o f r e f r a c t o r y m a t e r i a l s . [ 8 + 8 ] 3.a) Explain the difference between temporary and permanent hardness. What are the units involved in expression of hardness of water? Describe their inter conversion. b) Give a brief account of the methods used in the treatment of water for domestic p u r p o s e s . [ 8 + 8 ] 4.a) Describe the lime-Soda process used for softening of hard water. b) Calculate the quantities of lime and soda used for softening of a water sample obtained form chittoor town in Andhra Pradesh which showed the following analyses :- (Assume that 20,000 litres of this water is to be softened). Ca(NO 3 )=1.64 mg/liter ; Ca(HCO 3 ) 2 =1.62 mg/liter; Mg(SO 4 )=2.40 mg/liter ; MgCl 2 =0.94 mg/liter Mg(NO 3 )=1.20 mg/liter ; Organic impurities = 2.20 mg/liter. [8+8] 5.a) Explain the process of caustic embrittlement. b) Differentiate between pitting corrosion and stress corrosion. c) Write a note on cathodic protection and sacrificial anode. [ 5+5+6 ] 6.a) What are lubricants? How are they classified? Give examples. b) Discuss the following properties of lubricants: i) Viscosity ii) Carbon residue and iii) Saponification number. [8+8]
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7.a) Describe the processes of tinning and metal cladding. b) What are organic paints? How are they useful? Explain their constituents and their f u n c t i o n s . [ 8 + 8 ] 8. Write notes on any two of the following: a) Lines and their manufacture b) Manufacture of cements c) Setting and hardening of cements. [8+8] ****
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27438878-r05010104-Applied-Chemistry - Code.No 31001 R05...

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