Electronics 2 May/June 2010

Electronics Paper 2, May/June 2010

Questions:		1	2	3	4	5, 6 &7	8	9	10	Main

General Comments
Weakness/Remedies
Strength

Question 1
(a) Describe briefly the formation of a pn junction. (b) Draw the current-voltage characteristics of an pn junction and indicate the following: (i) forward region; (ii) reverse region; (iii) reverse saturation current; (iv) breakdown voltage. (c) State one application of a pn junction.
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OBSERVATION
The expected answers were: A pn junction is formed when one side of the intrinsic material is doped to form a P- region and the other side doped to form an N-region. (c) Application of pn junction (i) Switch (ii) Rectifier (iii) Voltage stabilization The question was on Bipolar Transistor and other Semiconductor Devices. It was quite popular with the candidates. However, the performance was average.