Electronics Paper 2, Nov/Dec. 2011

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

General Comments
Weakness/Remedies
Strength

Question 3
(a) Define the following static parameters of a transistor connected in common emitter configuration: (i) current gain; (ii) output impedance. (b) Draw and label the output characteristics of the common emitter transistor configuration. (c) A transistor has a base current, Ib, of 50 mA and a collector current, Ic, of 2 mA. If a voltage, VCE, of 7.5 V is applied, calculate the (i) current gain, (ii) output impedance.
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OBSERVATION
The expected answers were: (a) (i) Current Gain (ii) Output impedance Zo = (b) (b) Assumption of CE configuration = = 0.04 = = = 3.75 kΩ The question was on Amplifiers. The question was attempted by many candidates. The performance was average.The expected answers were: (a) (i) Current Gain (ii) Output impedance Zo = (b) (b) Assumption of CE configuration = = 0.04 = = = 3.75 kΩ The question was on Amplifiers. The question was attempted by many candidates. The performance was average.