Chemistry : Question Paper Jan 2013 - First Year Engineering (Semester 1) | Gujarat Technological University (GTU)

Chemistry - Jan 2013

First Year Engineering (Semester 1)

(1) Question 1 is compulsory.
(2) Attempt any four from the remaining questions.
(3) Assume data wherever required.
(4) Figures to the right indicate full marks.
1(a) What is meant by softening of water? With a neat sc hematic diagram, describe cold lime soda process(7 marks) 1(b) What are the characteristic of a good fuel? Explain any one method of analysis(7 marks) 2(a) Define the desalination of brackish water and Explain method of electro dialysis.(7 marks) 2(b) Calculate the temporary and total Hardness of water sample containing following data in mg/L.
$$Mg(HCO_{3})_{2}=73;Ca(HCO_{3})_{2}=162;MgCl_{2}=95; CaSO_{4}=136\$$ Give molecular weight of $$Mg(HCO_{3})_{2}=146; Ca(HCO_{3})_{2}=162; MgCl_{2}=95; CaSO_{4}=136\$$
(7 marks)
3(a) Describe with the help of a neat diagram of rotary kiln for the manufacture of Portland cement by wet process(7 marks) 3(b) Discuss the classification of polymers.(7 marks) 4(a) What are the constituents of Portland cement? Discu ss the mechanism of setting and hardening of Portland cement. (7 marks) 4(b) Explain the types of polymerization giving suitable examples. (7 marks) 5(a) Explain the mechanism of electrochemical corrosion(7 marks) 5(b) What is galvanic corrosion? Explain its mechanism.(7 marks) 6(a) Define heat treatment and explain the following met hods.
(i) Annealing; (ii) Hardening.
(7 marks)
6(b) Define the term lubricant. Explain the following pr operties of lubricants and their significance.
(i)Viscosity; (ii) Flash point.
(7 marks)
7(a) Describe the process of melt spinning and wet spinning of fibers. (7 marks) 7(b) Explain the manufacture of ethyl alcohol by fermentation(7 marks)


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