Engineering Chemistry - May 2013
First Year Engineering (Set B) (Semester 2)
TOTAL MARKS: 100
TOTAL TIME: 3 HOURS (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.
Answer any one question from 1 & 2
1 (a) Explain the principal and process of Lime- soda softening of water giving the different chemical reactions involved in the process. Give advantage of hot lime-soda process ?(10 marks) 1 (b) Define different units for expressing hardness of water. Give relationship between these units.?(10 marks)
Write a short note on the following :-
10 (a) Setting & Hardening of cement(7 marks) 10 (b) Beer's Lambert Law?(7 marks) 10 (c) IR spectroscopy and its applications(7 marks) 2 (a) What is boiler scale? What is ill-effect of scales? Discuss various internal Conditioning methods to prevent scale formation.?(10 marks) 2 (b) What is the principal of EDTA titration? How can the permanent hardness of the water be determined by this method ?(10 marks)
Answer any one question from 3 & 4
3 (a) What are the difference between gross and net calorific value ?(5 marks) 3 (b) A coal has the following composition by weight: C= 90%, O = 3.0, S =0.5% and ash = 2.5%. Net calorific value of the coal was Found to be 8490.5 kcal/kg. Calculate the percentage of hydrogen and higher Calorific value of coal.?(10 marks) 3 (c) How the calorific value of coal can be determined by Bomb calorimeter ? (5 marks) 4 (a) Write the significance & determination of proximate analysis of coal.?(5 marks) 4 (b) A Sample of coal was analysis as follow: 2.5 gm sample of coal was weighed in a silica crucible after heating for 60 minutes at 110 C. the residue weigh L obtained 2.425 gm. The crucible then was covered with a vented lid and heated strongly for 7 minutes at 950C ± 20 C. the weight of residue was 1.520 gm. The crucible was then heated without lid, until a constant weight was obtained. The weight of the final residue was 0.232 gm. Calculate the percentage result of the above in from of proximate analysis.(10 marks) 4 (c) Explain moving bed catalytic cracking(5 marks)
Answer any one question from 5 & 6
5 Explain the following properties of lubricants and discuss their significance:
(i) Flash and Fire points
(ii) Cloud and pour points
(iii) Saponification number
(iv) Neutralization Number(20 marks) 6 (a) Explain Mechanism of Lubrication?(5 marks) 6 (b) Write short note on viscosity measurements?(5 marks) 6 (c) Write short note on solid lubricants?(5 marks) 6 (d) Define and classify lubricants with suitable examples?(5 marks)
Answer any one question fron 7 & 8
7 Explain the following with example:
(i) Addition polymerization
(ii) Condensation polymerization
(iii) Co- polymerization
(iv) Vulcanization of rubber(20 marks) 8 Discuss preparation, properties and uses of
(ii) Buna S
(iv) Nylon 6:6
Answer any one question from 9 & 10
9 (a) Draw a labeled diagram of rotary kiln used for manufacture of Portland cement by wet process gives various chemical reactions taking place in furnace. ?(10 marks) 9 (b) Discuss Chromatography and its application?(5 marks) 9 (c) Define and classify refractory with suitable examples?(5 marks)