waecE-LEARNING
Electronics Paper 2, Nov/Dec. 2012  
Questions: 1 2 3 4 5 6 7 8 9 10 Main
General Comments
Weakness/Remedies
Strength















Question 9

(a)    Describe with the aid of a circuit diagram the principle of operations of a
tuned collector oscillator.

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OBSERVATION


TThe expected answers were:

vcc

322


Description
L1,Cl - Collector tuned circuit that determines frequency of oscillation
Ll,Lz - provide positive feedback
Transistor, R1,Rz, RE - amplifier circuit that provide gain to sustain
oscillation.

The question was on Oscillators. The question was unpopular with the
candidates. The performance was reported poor.

 

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