Electronics and Communication Engineering - Digital Electronics - Discussion


For the gate in the given figure the output will be

[B]. 1
[C]. A
[D]. A

Answer: Option D


If A = 0, Y = 1 and A = 1, Y = 0 Therefore Y = A.

Vamsikrishna said: (Dec 1, 2014)  
Why can't we choose option 'a'?

Raja said: (Jan 13, 2015)  
It's actual not gate so a=0; y=1, a=1; y=0.

Reshmi said: (Jul 20, 2015)  
Here the gate is XNOR. Output will be one when both inputs are same i,e, 00=1 and 11=1. Here 2nd input is always AND so zero.

So possibilities are A become 1 or 0. (if A=1, input 10=0 ie A' if A=0 input 00=1 since gate is xnor i.e A').

Vicky said: (May 27, 2016)  
Formula XNOR = A(BAR) B(BAR) + AB.

So, from the given question: A (bar). 1 + A (0) = A(BAR).

Anusha. Byravaram said: (Aug 25, 2017)  
If we take both inputs as 0 or both as 1, then the answer will be change.
Then why you have taken only 0 and 1,
1 and 0.?

Ayush Kumar said: (Nov 4, 2017)  
Right answer is D because A^0^ + A.0 = A^.

Dhammapriy said: (Mar 19, 2018)  
Actually, when you tie one of the inputs of XNOR gate to logic 0 then XNOR gate behaves as a inverter.

Habiba said: (May 18, 2018)  
Please explain it clearly.

M S Kamalanadhan said: (Sep 6, 2018)  
It is XNOR gate so when both ip's are same op is 1.

V Naga Pranavi said: (Sep 20, 2018)  
It is the XNOR gate. One input is A. Here the other input(say B) is 0. since it is grounded.
When A=0 B=0, O/p Y='1'.
when A=1 B=0 O/p Y='0';
i.e; Y=A'.

Vijaya said: (Dec 5, 2018)  
Well said. Thank you @Reshmi.

Bhargav said: (Dec 8, 2020)  
Nice explanation, Thanks @V Naga Pranavi.

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