7HD Electrochemical Engineering April 1999
Part A (20 x 2 = 40 Marks)
- What is metallic conduction and electrolytic conduction?
- Explain equivalent conductance
- Define cell constant
- What is transport number?
- What is Nernst diffusion current?
- Explain passive state
- What is concentration polarization?
- What is galvanic corrosion?
- Define corrosion fatigue
- What is caustic embrittlement?
- Explain the applications of lead-acid batteries
- What is inhibitor?
- Explain fuel cell
- Discuss the factors that affect battery capacity
- What is anodizing?
- Define electroforming
- What is electropolishing?
- Distinguish between primary and secondary batteries
- Explain the term energy density
- Define solid electrolytes
Part B (5 x 12 = 60 Marks)
- (a) Write notes on:
- Electro capillary curve
- Helmoltz layer
- Guay-Stevan’s layer
(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
- (a) Discuss about the convective diffusion theory and the mass transfer coefficient
(b) Enumerate the various dimensionless groups which are considered while computing mass transfer coefficient for a given geometric electrode configuration and flow considerations
- (a) Write briefly on control of bio-corrosion
(b) Explain the role played by inhibitors with reference
(c) Write a comprehensive account of corrosion monitoring methods
(d) Describe the phenomenon ‘Dezincification’
- (a) What is a reverse electrolyte cell? Illustrate with examples
(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
(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
- (a) How is Graphite obtained from Silicon-Carbide? Mention the properties and uses of graphite
(b) Write briefly on any THREE of the following:
- Electro deposition
- Solar cells
- Sacrificial anodes
- Insoluble electrodes