waecE-LEARNING
Electronics Paper 2, Nov/Dec. 2014  
Questions: 1 2 3 4 5 6 7 Main
General Comments
Weakness/Remedies
Strength















Question 2
  1. State three parameters that determine the performance of a power supply.

(b) List three sources of power supply for electronic circuits.
(c) Draw a Zener diode stabilizing circuit.

          The expected answers were:
 (a)    Three parameters that determine the performance of a power supply
(i)   Voltage regulation factor
             (ii)  Ripple factor
             (iii) Efficiency                                                                                                                                                                                                                                                                                                  
            (b)     Any three sources of power supply for electronic circuits
                        (i)  Dry cells
                        (ii) Solar cells
                        (iii)Accumulator
                        (iv)Power packs

            (c)    Zener diode regulating circuit

 

                                                                         
                                                                                                                       

_____________________________________________________________________________________________________
OBSERVATION

The question was on Power Supply. The question was very unpopular with the candidates. The performance was below average.

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