7HD - Electrochemical Engineering - October'1998

Part A (20 x 2 = 40 Marks)

  1. Define the term 'electrocapillarity'
  2. Write the assumptions made in Helmholtz Perrin model
  3. Define the 'electromotive force'
  4. Describe the term electrical double layer
  5. Explain liquid junction potential
  6. Explain charge transfer overpotential
  7. What is Prandtl Boundary layer?
  8. Write the expression for the overall cell potential
  9. Mention atleast two inhibitors for cooling water
  10. Define vapor phase inhibitors
  11. What is a sacrificial anode?
  12. What is stress corrosion cracking?
  13. What is a fuel cell?
  14. What is maintenance free lead acid battery?
  15. What is Titanium substrate insoluble anode?
  16. What is throwing power?
  17. Briefly indicate how open circuit potential can be measured
  18. Give some examples of depolariser
  19. What are the different forms of corrosion?
  20. Write the cell reactions for Ni-Fe cell
  21.  

  22. (a) Derive Stern model theory with the clear indication of the assumptions made
  23. Or

    (b) Explain the terms: inner potential, outer potential and surface potential

  24. (a) How diffusion coefficient is found using rotating disc electrode?
  25. Or

    (b) Discuss the secondary current distribution on parallel plate electrodes

  26. (a) Explain the corrosion prevention using protective coatings
  27. Or

    (b) Explain corrosion and its prevention in steam boiler

  28. (a) Write briefly on alkaline-manganese cell
  29. Or

    (b) Discuss the working of fuel cells and also the recent advances made

  30. (a) Explain Electro-winning process with a suitable example from Industry
  31. Or

    (b) Explain with a neat diagram of cell design suitable for metal recovery from very low concentration