Question

If two numbers are not equal then binary variable will be ____________

(a) 0

(b) 1

(c) A

(d) B

I got this question in a job interview.

This interesting question is from Magnitude Comparator topic in chapter Combinational Circuits of Digital Circuits

Answer 1

The correct answer is (a) 0

To explain: A comparator is a combinational circuit that takes two numbers as input in binary form and results whether one input is greater, lesser or equal to the other input. In a digital comparator, only 3 outputs are possible (i.e. A = B, A >B, A < B). Other than this, the output will be 0.