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# 2006 Calicut University B.E Computer Science Engineering Chemistry (A) Question paper

University Question Papers
2006 Calicut University B.E Computer Science Engineering Chemistry (A) Question paper
COMBINED FIRST AND SECOND SEMESTER B.TECH. (ENGINEERING)
DEGREE EXAMINATION, JUNE 2006

EN 04. 104 A – ENGINEERING CHEMISTRY (A)
(For AI, CS, EE, EC, IT, IC, BM, BT, PT)

Time : Three Hours Maximum : 100 Marks

Part A

I. 1. With a neat diagram, explain the voids in crystal structure.
2. Write short notes on (i) Ferro-electricity; and (ii) Piezoelectricity.
3. Explain the following terms :
(i) Calendering ; (ii) Die casting.
4. Give the significance of the following : (i) Aniline point ; (ii) Cloud point ; and (iii) Pour point.
5. Explain the function of salt bridge in e.m.f. measurement with a diagram.
6. Calculate the pH of a buffer solution containing 20ml. of 0.1 N acetic acid and 10 ml. of 0.1 N NaOH. If the Ka value of acetic acid is 1.75 X 10-5.
7. Corrosion products can act as a protective layer. Explain the term with the help of pilling bed worth rule.
8. Write short notes on thermal pollution.
(8 X 5 = 40 marks)

Part B

II.A. (i) How are crystalline solids classified on the nature of forces binding the constituent units ? (8 marks)
(ii) Derive Braggs equation for diffraction of X-rays by crystal. (7 marks)

Or

B. (i) What are superconductors ? Explain their properties and uses. (7 marks)
(ii) Explain the following facts :-
(a) Copper is ductile and malleable but brass is not.
(b) Sodium chloride pieces are harder than sodium metal. (8 marks)

III. A. (i) Write a note on compounding of rubber. (7 marks)
(ii) How is vulcanization of rubber carried out ? (8 marks)

Or

B. (i) Write short note on extreme pressure lubrication. (7 marks)
(ii) How is the viscosity of a lubricating oil determined ? How the viscosity index of an oil can be improved ? (8 marks)

IV. A. (i) Write short notes on :
(a) Concentration cells.
(b) Over voltage. (8 marks)
(ii) How is neutralization reactions carried out by e.m.f. measurements ? (7 marks)
Or
B. (i) Explain the construction and working of Ni/Cd cell. (7 marks)
(ii) Suggest a suitable method to determine the e.m.f. of a cell with a neat sketch. (8 marks)

V. A. (i) Explain the mechanism of electrochemical corrosion. (7 marks)
(ii) List out few methods used to control air-pollution. (8 marks)
Or
B. (i) Explain the chemistry of chrome plating with a neat diagram. (7 marks)
(ii) Explain the secondary and tertiary treatment of sewage water. (8 marks)
[4 X 15 = 60 marks]