7HD Electrochemical Engineering April 1999

Part A (20 x 2 = 40 Marks)

  1. What is metallic conduction and electrolytic conduction?
  2. Explain equivalent conductance
  3. Define cell constant
  4. What is transport number?
  5. What is Nernst diffusion current?
  6. Explain passive state
  7. What is concentration polarization?
  8. What is galvanic corrosion?
  9. Define corrosion fatigue
  10. What is caustic embrittlement?
  11. Explain the applications of lead-acid batteries
  12. What is inhibitor?
  13. Explain fuel cell
  14. Discuss the factors that affect battery capacity
  15. What is anodizing?
  16. Define electroforming
  17. What is electropolishing?
  18. Distinguish between primary and secondary batteries
  19. Explain the term energy density
  20. Define solid electrolytes
  21. Part B (5 x 12 = 60 Marks)

  22. (a) Write notes on:
    1. Electro capillary curve
    2. Helmoltz layer
    3. Guay-Stevan’s layer

    Or

    (b) Explain the various types of electrolytes used in battery systems with examples. What are gel electrolytes?

    (c) What are the properties of anodes and cathodes? Explain the different types of anodes and cathodes

  23. (a) Discuss about the convective diffusion theory and the mass transfer coefficient
  24. Or

    (b) Enumerate the various dimensionless groups which are considered while computing mass transfer coefficient for a given geometric electrode configuration and flow considerations

  25. (a) Write briefly on control of bio-corrosion
  26. (b) Explain the role played by inhibitors with reference

    Or

    (c) Write a comprehensive account of corrosion monitoring methods

    (d) Describe the phenomenon ‘Dezincification’

  27. (a) What is a reverse electrolyte cell? Illustrate with examples
  28. (b) What are the various types of positive and negative plates in a lead-acid cell and write down the methods of manufacture of these plates

    Or

    (c) Give a detailed account of various tests to be performed in order to evaluate a secondary battery system

    (d) Write a note on Fuel cells

  29. (a) How is Graphite obtained from Silicon-Carbide? Mention the properties and uses of graphite

    Or

    (b) Write briefly on any THREE of the following:

    1. Electro deposition
    2. Solar cells
    3. Sacrificial anodes
    4. Insoluble electrodes