Rajiv Gandhi Proudyogiki Vishwavidyalaya 2009 B.E Engineering Chemistry Engg chemistry 101 - Question Paper

B.E. (1st/ second Semester) EXAMINATION, DECEMBER 2009
ENGINEERING CHEMISTRY [ BE-101 ]
Time: 3Hrs Max Marks: 100 Min Marks: 35
Note:Attempt any five ques. taking one ques. from every unit.All ques. Carry equal marks.
UNIT-I
Q.1.(a) discuss the principal and process of Lime- soda softening of water giving the various chemical reactions involved in the process. provide advantage of hot lime-soda process.? 10
(b) describe various units for expressing hardness of water.Give relationship ranging from these units.? 10
OR
Q.2.(a) What is boiler scale? What is ill-effect of scales? explain different internal Conditioning methods to prevent scale formation.? 10
(b) What is the principal of EDTA titration? How can the permanent hardness of the water be determined by this method ?10
UNIT-II
Q.3.(a) elaborate the difference ranging from gross and net calorific value ? 5
(b) A coal has the subsequent composition by weight:
C= 90%, O = 3.0, S =0.5% and ash = 2.5%. Net calorific value of the coal was obtained to be 8490.5 kcal/kg. compute the percentage of hydrogen and higher Calorific value of coal.? 10
(c) How the calorific value of coal can be determined by Bomb calorimeter ? 5
OR
Q.4.(a) Write the significance & determination of proximate analysis of coal.? 5
(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 found 2.425 gm. The crucible then was covered with a vented lid and heated strongly for seven minutes at 950 C ± 20 C. the weight of residue was 1.520 gm. The crucible was then heated without lid, until a constant weight was found. The weight of the final residue was 0.232 gm. compute the percentage outcome of the above in from of proximate analysis. 10
(c) discuss moving bed catalytic cracking ? 5
UNIT-III
Q.5. discuss the subsequent properties of lubricants and explain their significance: 20
(i) Flash and Fire points
(ii) Cloud and pour points
(iii) Saponification number
(iv) Neutralization Number
OR
Q.6.(a) discuss Mechanism of Lubrication? 5
(b) Write short note on viscosity measurements? 5
(c) Write short note on solid lubricants? 5
(d) describe and classify lubricants with suitable examples? 5
UNIT-IV
Q.7. discuss the subsequent with example: 20
(i) Addition polymerization
(ii) Condensation polymerization
(iii) Co- polymerization
(iv) Vulcanization of rubber
OR
Q.8. explain preparation, properties and uses of 20
(i) PMMA
(ii) Buna S
(iii) Polyethylene
(iv) Nylon 6:6
UNIT-V
Q.9.(a) Draw a tagged diagram of rotary kiln used for manufacture of Portland cement by wet process provide different chemical reactions taking place in furnace. ? 10
(b) explain Chromatography and its application? 5
(c) describe and classify refractory with suitable examples? 5
OR
Q.10. Write short note on the subsequent 20
(a) Setting & Hardening of cement
(b) Beers – Lambert legal regulations
(c) IR – spectroscopy and its applications

Earning:   Approval pending.