GATE | GATE-CS-2014-(Set-3) | Question 65

Consider the following combinational function block involving four Boolean variables x, y, a, b where x, a, b are inputs and y is the output.

f (x, y, a, b)
{
   if (x is 1) y = a;
   else y = b;
}

Which one of the following digital logic blocks is the most suitable for implementing this function?
(A) Full adder
(B) Priority encoder
(C) Multiplexer
(D) Flip-flop

Answer: (C)
Explanation: This function can be interpreted as having two inputs a, b and select signal x. Output y will depend on the select signal x.

Function will be like (ax+bx’)

Its implementation will be like

So ans is ( C) part.
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