Gujarat Technological University 2009-2nd Sem B.E Computer Engineering [All Branch] , Subject Name: Chemistry - Question Paper
GUJARAT TECHNOLOGICAL UNIVERSITY
B.E Sem-II [All Branch] exam June 2009
Subject code: 110001
Subject Name: Chemistry
Date: 08/06/2009
Total Marks: 70
GUJARAT TECHNOLOGICAL UNIVERSITY
B.E Sem-II [All Branch] Examination June 2009
Seat No. Enrolment No.
Subject code: 110001 Subject Name: Chemistry
GUJARAT TECHNOLOGICAL UNIVERSITY
B.E Sem-II [All Branch] Examination June 2009
Seat No. Enrolment No.
Time: 10.30am. - 1.00pm Total Marks: 70
Date: 08/06/2009
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) What are lubricants? Classify lubricants and mention various 06 properties assessed for lube oils.
(b) What is meant by caustic embrittlements for boilers and break point 04 chlorination for water treatment?
(c) Give classification of plastics and also give at least two points of 04 difference between them.
Q.2 (a) Mention different methods for analysis of coal. Discuss 06 characteristics of good quality coke.
(b) Explain problems which arise due to direct use of untreated hard 04 water in boilers.
(c) Calculate temporary hardness and permanent hardness of water in 04 ppm from following results. Mg (HCO3)2 = 16.8 mg/l, MgCl2 = 19.0 mg/l, KCl = 74.5 mg/l, Mg (NO3)2 = 29.6 mg/l, CaCO3 = 20.0 mg/l
and MgSO4 = 24.0 mg/l.
(c) 10,000 liters of hard water was made soft with zeolite; the zeolite 04 requires a total amount of eight liters of NaCl solution containing 150 gm/l of NaCl for regeneration. Calculate the hardness of water
Q.3 (a) What are Portland cements? How is Portland cement manufactured? 06 Give the chemical composition of Portland cement.
i. Styrene Rubber (Buna - S)
ii. Nitrile Rubber (Buna - N)
Q.3 (a) Give classification of lime with its uses. Describe manufacturing 06 process of lime.
i. Photochemical smog
ii. Acid Rain
Q.4 (a) Mention general characteristics of alloys. What is the need to make 06 alloys?
(b) Give the factors responsible for corrosion of boiler. How can you 04 prevent it?
(a) What is metallurgy? Explain general steps involved in metallurgy.
(b) State purification processes for metals.
(c) Explain cathodic protection.
(a)
(b) (c)
06
04
04
(a)
(b)
(c)
Q.5
06
04
04
What is fermentation? Explain enzymes and its applications in industries.
What is grease? Mention few properties of grease.
The following data were obtained in a bomb calorimeter experiment. Weight of crucible = 3.649 gm Weight of crucible + fuel = 4.678 g;
Water equivalent of calorimeter = 570 gm Water taken in calorimeter = 2200 gm Observed rising temperature = 2.3 o C Cooling correction = 0.047 o C Acid correction = 62.6 Calories Fuse wire correction = 3.8 Calories
Calculate the gross calorific value of the fuel sample. If the fuel contains 7.0 % H2, determine the net calorific value.
OR
Give the characteristics of potable water. Mention various processes for removal of impurities.
Write short note on:
i. Bio-fuels
ii. Bio-membranes
Calculate weight and volume of air required for the combustion of 3 kg of carbon.
*************
2
|
Attachment: |
| Earning: Approval pending. |
