waecE-LEARNING
Electronics Paper 2, May/June 2013  
Questions: 1 2 3 4 5, 6 &7 8 9 10 Main
General Comments
Weakness/Remedies
Strength
Question 9
  1.  Define a bistable multivibrator.
  1.  State two applications of a bistable multivibrator.
  1.  Figure 5 is a logic circuit.



         Using Figure 5, complete Table 1.


    A

    B

    C

    D

    F

    1

    0

    0

    1

     

    1

    0

    1

    1

     

_____________________________________________________________________________________________________
OBSERVATION

The expected answers were:
                  

  1. A bistable multivibrator is a transistor oscillator circuit that has two stable output states.
  2. Application

              Frequency divider
               Counter
               Storage device in computer memory, etc.

  1. Truth Table

    A

    B

    C

    D

    F

    1

    0

    0

    1

    1

    1

    0

    1

    1

    0





    The question was on Logic gates. The question was popular with the candidates. The performance was fairly good.

 


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