Basic Electronics Paper 2, WASSCE (SC), 2017

Question 6

 

Observation

     

            The expected answers were;
            (a)Combinational logic circuit for the Boolean expression.                                                              
           


A NOR can be used in place of OR plus NOT gate.

(b)          Truth Table for an Ex-OR logic gate.

 


A

B

F

0

0

0

0

1

1

1

0

1

1

1

0

                                                                                                                                   
(c)Circuit symbol of the EX – OR logic gate

 


Majority of the candidates that attempted this question responded well to it. However, a few candidates could not give the correct truth table for the Ex-OR gate as well as give the correct symbol for the gate.