# Digital Electronics - Logic Gates - Discussion

### Discussion :: Logic Gates - General Questions (Q.No.37)

37.

A 2-input NOR gate is equivalent to a ________.

 [A]. negative-OR gate [B]. negative-AND gate [C]. negative-NAND gate [D]. none of the above

Explanation:

No answer description available for this question.

 M.Naresh said: (Aug 25, 2011) Please explain me.

 G.V.Narayanan said: (Sep 19, 2011) Reason for 2 input NOR gate we apply. Why this result for AND gate?

 Rooh said: (Oct 14, 2011) For input seq 00 01 10 11 output of nor is 1 0 0 0 output of and is 0 0 0 1 output of nand is 1 1 1 0 So wich is negegetive AND reffer to here i cant understand. For me it should be negetive OR... the option A will be the answer then.. If given answer is right then please explain it to me...

 Bhargavi said: (Mar 8, 2012) Can any one please explain this clearly ?

 Ashok said: (Apr 18, 2012) Negative and gate means your inputs are inverted to the and gate. So you get a output for (00 01 10 11) is 1 0 0 0. It same as the nor gate output. Ok.

 Komal said: (Jun 4, 2012) A Negative-AND gate functions same as AND gate with all its inputs inverted A B -A -B OR(A+B) NOR -AND(-A*-B) 0 0 1 1 0 1 1 0 1 1 0 1 0 0 1 0 0 1 1 0 0 1 1 0 0 1 0 0 From above truth table output of NOR gate and negative AND (Bubbled AND gate) are equal.

 Arjun Tehale said: (Oct 7, 2012) can any one spell it out properly plz

 Viswanath said: (Dec 29, 2012) If inverter is placed for the two terminals of the and gate. Then it is nor gate. Then from this we can say that -ve and gate is equivalent to nor gate.

 Khyati said: (Oct 25, 2013) If we compare truth table of negative AND gate And truth table of NOR gate. Than we can easily understand.

 Guruswamy said: (Jan 24, 2014) Given inputs are A, B, Case 1: For NOR gate output is (A+B)complement. Case 2 : For negative and gate output is: (A complement) * (B complement) = (A+B) complement.

 S Kumar Swami said: (Feb 21, 2014) In this problem we can solve like also, At first we have taken 2 input as 1 & 0. In the nor gate the output is 0. It is equivalent to negative and gate because in and gate we will got 0 as output. So in negative and gate it must be 1. Hence 2 input-nor gate is equivalent to negative and gate.

 Jagadish said: (Jun 16, 2015) NOR gate is equivalent to AND gate with its inputs bubbled. Means NOR gate = Inputs bubbled AND gate. Similarly NAND gate means inputs bubbled or gate.

 Nitesh Jain said: (Sep 29, 2015) How to Remember? -1/4AND ===negative==> NOR^-2. -1/4OR ===negative==> NAND^-2. -1/4NAND ===negative==> OR^-2. -1/4NOR ===negative==> AND^-2.

 Narottam said: (Jun 1, 2016) Why not option C?

 Shreyan said: (Jul 6, 2016) @Komal. I got it, Thanks.

 An007 said: (Aug 2, 2016) NOR = (A + B) compliment. -ve AND means bubble at the input,= NAND. A comp + B comp = A.B comp.

 Sharath said: (Aug 17, 2016) Nice explanation, Thanks to all.

 Sudhakar said: (Jun 9, 2017) I think Option 'A' is the answer.

 Pavan Chowdary said: (Sep 10, 2017) Yes, correct explanation @Guruswamy.