Dec 2010 BE SCYX1001 Engineering Chemistry Sathyabama University

Register Number

                               

SATHYABAMA UNIVERSITY

(Established under section 3 of UGC Act, 1956)

Course & Branch: B.E/B.Tech-Common to ALL Branches

Title of the Paper: Engineering Chemistry            Max. Marks: 80

Sub. Code: SCYX1001                                           Time: 3 Hours

Date: 08/12/2010                                                    Session: FN

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PART - A                (10 X 2 = 20)

Answer ALL the Questions

1.     A water sample contains 120 mg of MgSO₄ and 60 mg of NaCl. Calculate the hardness in terms of CaCO₃ Equivalent.

2.     Distinguish between scale and sludge.

3.     Why does the specific gravity of sulphuric acid decrease during the discharge of lead acid battery?

4.     How is lithium primary cells classified? Give examples.

5.     Define pilling bedworth rule. What is its significance?

6.     Bolt and nut made of the same metals are preferred in practice. Why?

7.     How are explosives assessed?

8.     What is the basic principle behind rocket engine?

9.     Distinguish between physisorption and chemisorption.

10.   What is electrostatic painting?

PART – B                       (5 x 12 = 60)

Answer ALL the Questions

11.   (a) Describe in detail the ion exchange process of softening of hard water. What are its advantages over zeolite process?   (8)

(b) Draw a schematic flow chart for domestic water treatment (Various stages involved).                                                     (4)

(or)

12.   (a) Explain how will you estimate the amount of hardness in sample water by EDTA method.                                                (8)

(b) What is reverse osmosis? What are its merits and demerits?

(4)

       

13.   (a) What is reversible battery? Discuss the construction and working of lead acid battery with reaction involving charging and discharging reactions.                                                                (8)

(b) Define the terms (i) Cycle life (ii) Internal resistance     (4)

(or)

14.   What are fuel cells? Give examples. Explain the principle, construction and working of Solid oxygen fuel cell, and how it differs from membrane fuel cell.

15.   (a) What is electrochemical corrosion? What are the conditions for electrochemical corrosion? Explain its mechanism?    (8)

(b) Write short notes on types of wet corrosion.                    (4)

(or)

16.   (a) Mention the various factors influencing corrosion. Discuss the importance of design and material selection in corrosion control.

(8)

(b) How will you protect an underground pipeline from corrosion?                                                                             (4)

17.   What are explosives? What are the requirements for explosives? How are they classified? Discuss the types of explosives with examples.

(or)

18.   What are the requirements for chemical propellants? Explain the classification of chemical propellants with examples.

19.   (a) Derive Langmuir adsorption isotherm stating the assumption on which it is based. Explain how isotherm equation is modified at various pressures.                                                                (8)

(b) Deduce Freundlich adsorption equation. What are its limitations?                                                                                 (4)

(or)

20.   (a) Explain the role of adsorbents in catalysis and water softening.                                                                             (8)

(b) What is emulsion? What are the types of emulsion?       (4)

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