Download OU B-Tech First Year 2012 January 5005 Chemical Engineering Question Paper

Download OU (Osmania University) B.Tech (Bachelor of Technology) First Year (1st Year) 2012 January 5005 Chemical Engineering Question Paper

1111 111 11 1 111111111 11 1111111111 11 1 1 Code No.: 5005/N
FACULTY OF ENGINEERING AND INFORMATICS
B.E. 1 Year (New) (Common to All Branches) (Suppl.)
Examination, January 2012
ENGINEERING CHEMISTRY
Time: 3 Hours] [Max. Marks: 75
Note : Answer all questions from Part A. Answer any five
questions from Part B.
PART- A (25 Marks)
1. Define standard electrode potential. What is its significance ? 3
2. Distinguish between primary and secondary batteries. 2
3. Why the work done in isothermal reversible process is more than the adiabatic
reversible process ? 3
4. Explain the physical significance of entropy. 2
5. Write a note on Galvanic corrosion. 3
6. What is paint ? What are its constituents ? 2
7. Explain Homo and Co-polymers with an example. 2
8. What are composites ? Give their advantages. 3
9. Define Octane number. What is its significance ? 2
10. Give the characteristics of a good propellant. 3
PART B (5x10=50 Marks)
11. a) What is Nernst equation ? Derive it for Metal-Metal ion electrode. 4
b) Write the cell reaction and calculate the emf of the following all at 25?C : 4
Zn(s)gn+
2
(0.2 M) If Ag+ (0.02 M) lAg(s).
Given that E; +0.76 V, and r
Ag
= -0.80V .
Ag
+

c) What are the advantages of fuel cells ? 2
(This paper contains 2 pages)
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1111 111 11 1 111111111 11 1111111111 11 1 1 Code No.: 5005/N
FACULTY OF ENGINEERING AND INFORMATICS
B.E. 1 Year (New) (Common to All Branches) (Suppl.)
Examination, January 2012
ENGINEERING CHEMISTRY
Time: 3 Hours] [Max. Marks: 75
Note : Answer all questions from Part A. Answer any five
questions from Part B.
PART- A (25 Marks)
1. Define standard electrode potential. What is its significance ? 3
2. Distinguish between primary and secondary batteries. 2
3. Why the work done in isothermal reversible process is more than the adiabatic
reversible process ? 3
4. Explain the physical significance of entropy. 2
5. Write a note on Galvanic corrosion. 3
6. What is paint ? What are its constituents ? 2
7. Explain Homo and Co-polymers with an example. 2
8. What are composites ? Give their advantages. 3
9. Define Octane number. What is its significance ? 2
10. Give the characteristics of a good propellant. 3
PART B (5x10=50 Marks)
11. a) What is Nernst equation ? Derive it for Metal-Metal ion electrode. 4
b) Write the cell reaction and calculate the emf of the following all at 25?C : 4
Zn(s)gn+
2
(0.2 M) If Ag+ (0.02 M) lAg(s).
Given that E; +0.76 V, and r
Ag
= -0.80V .
Ag
+

c) What are the advantages of fuel cells ? 2
(This paper contains 2 pages)
111111111111111111111111111111111
Code No.: 5005/N
12. a) What are the limitations of first law of thermodynamics ? State the different
statements of second law of thermodynamics.
6
b) One mole of an ideal gas absorbs 400 J of heat from its surroundings and expands
against a constant external pressure of 1 atm from a volume of 5 litres to 10 litres.
Calculate work done and the change in internal energy for the process. 4
13. a) Define corrosion of metals. Explain the mechanism of electrochemical theory
of wet corrosion.
4
b) What is cathodic protection ? Explain sacrificial anodic protection method.
3
c)
Calculate the temporary and permanent hardness of sample of water containing :
3
Ca(HCO
3
)
2
= 32.4 mg/L, Mg(HCO
3
)
2
= 29.2 mg/L
CaSO
4
= 27.2 mg/L, MgCl
2
= 9.5 mg/L and NaCI = 40 mg/L.
14. a) Explain addition, condensation and copolymerization with an example.
6
b) Give the preparation and uses of the following :
4
i) Bakelite ii) Buna-S rubber.
15. a) What are chemical fuels ? Give their classification with examples.
4
b) What is cracking of petroleum ? Describe with a neat diagram the fixed Bed
Catalytic Cracking method.
6
16. a) Explain the principle and procedure involved in conductometric acid-base
titrations.
5
b) What is Gibb's phase rule ? Apply it to Pb Ag system by drawing a well
labelled phase diagram.
5
17. a) Describe the determination of hardness of water by EDTA method.
5
b) Write a short note on the following :
5
i) Conducting polymers
ii) Ultimate analysis of coal.
2 1,800
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