UGC NET CSE | August 2016 | Part 3 | Question: 6

Question

The output of the following combinational circuit

is :

• A. $X . Y$
• B. $X + Y$ 
• C. $X \bigoplus Y$
• D. $X \bigoplus Y$

Comments

@makhdoom ghaya Sir, it needs editing → Duplicate picture + No XNOR Gate available in options.

Answer 1

In option D it should be complement of X⨁Y  which is the ans 

o/p of first NAND     gate    (x'y')'=x+y

o/p of second  NAND gate (xy)'=x'+y'

p/p of final NAND gate ((x+y)(x'+y')) ' =(xy'+yx')'=(x⨁y)'=x XNOR y option D 

Answer 2

x'y'+xy (ans)