Download Aptitude Crack
img not found img not found

Combinational Logic Analysis - Technical MCQs

Q1:

A 4-variable AND-OR circuit produces a 0 at its Y output. Which combination of inputs is correct?

A A = 0, B = 0, C = 1, D = 1

B A = 1, B = 1, C = 0, D = 0

C A = 1, B = 1, C = 1, D = 1

D A = 1, B = 0, C = 1, D = 0

ANS:D - A = 1, B = 0, C = 1, D = 0

A AND with B.
C AND with D.
Output of first AND gate AB is OR with output of second AND gate is CD.

So, output of OR gate is,
Y= AB+CD.

So, A=1, B=0, C=1, D=0.
AB=0, CD=0.

So Output Y=0.
Option D is the write Answer.