7HD – October 1999
Part A (20 x 2 = 40 Marks)
Part B (5 x 12 = 60 Marks)
(ii) Write a note on conductivity cells
(b) What is over voltage? Explain the methods to measure over voltage. What are the factors affecting over voltage?
(b) Explain the method of determination of electrode potential of zinc electrode
(ii) Discuss the problem of stray current corrosion in buried pipelines
(b) (i) Enumerate the factors that affect atmospheric corrosion
(ii) Write a note on marine corrosion
(ii) Discuss the performance characteristic of a Nickel-Cadmium cell (3)
(iii) Write a note on Lechlanche dry cell (3)
(b) (i) Discuss the actual efficiency of an electrochemical energy converter
(ii) Explain why an electrochemical cell does not work at the equilibrium potential value
(ii) Write notes on function of separators in battery systems. Give examples (3)
(b) Explain the reaction mechanism, construction, performance characteristic and applications of Silver-Zinc batteries.