Digital Electronics - Logic Gates - Discussion
Discussion Forum : Logic Gates - General Questions (Q.No. 2)
2.
If a 3-input NOR gate has eight input possibilities, how many of those possibilities will result in a HIGH output?
Discussion:
38 comments Page 3 of 4.
Veeru said:
1 decade ago
NOR means compliment of or for a 3 input or gate it has 7 possibilities of high.
Hence the ans is 1
Hence the ans is 1
Heena said:
1 decade ago
When both the inputs of OR gate are high then also output of NOR gate is high. So we cannot say that only in case of both low it will be high.
Kajal Ahuja said:
1 decade ago
The output of NOR gate is high only when all the inputs given to the gate are low that means the output will be 1 only when all inputs are 0.
Al-imran masum said:
1 decade ago
Only, . A=0, B=0, C=0 is equal output is 1. That means high. But the another possibilities output is also 0. That means low. So our answer is 1.
Js dhaker said:
1 decade ago
A B C = OR NOR
0 0 0 0 1
0 0 1 1 0
0 1 0 1 0
0 1 1 1 0
1 0 0 1 0
1 0 1 1 0
1 1 0 1 0
1 1 1 1 0
0 0 0 0 1
0 0 1 1 0
0 1 0 1 0
0 1 1 1 0
1 0 0 1 0
1 0 1 1 0
1 1 0 1 0
1 1 1 1 0
Devendra babu said:
1 decade ago
Actually the truth table for NOR Gate is given by
A B Y
0 0 1
0 1 0
1 0 0
1 1 0
and similarly truth table for 3input nor gate s
A B C Y
0 0 0 1
0 0 1 0
0 1 0 0
0 1 1 0
1 0 0 0
1 0 1 0
1 1 0 0
1 1 1 0
So, only one output s high.hence option A is the correct option to be elected which was given in the choices
A B Y
0 0 1
0 1 0
1 0 0
1 1 0
and similarly truth table for 3input nor gate s
A B C Y
0 0 0 1
0 0 1 0
0 1 0 0
0 1 1 0
1 0 0 0
1 0 1 0
1 1 0 0
1 1 1 0
So, only one output s high.hence option A is the correct option to be elected which was given in the choices
Rashmi said:
1 decade ago
For nor gate the basic truth table s A B Y
0 0 1
0 1 0
1 0 0
1 1 0
and in the same way truth tablefor 3input norgate s
A B C Y
0 0 0 1
0 0 1 0
0 1 0 0
0 1 1 0
1 0 0 0
1 0 1 0
1 1 0 0
1 1 1 0 here only one output s high.hence option A
0 0 1
0 1 0
1 0 0
1 1 0
and in the same way truth tablefor 3input norgate s
A B C Y
0 0 0 1
0 0 1 0
0 1 0 0
0 1 1 0
1 0 0 0
1 0 1 0
1 1 0 0
1 1 1 0 here only one output s high.hence option A
DIPASREE BANERJEE said:
1 decade ago
The answer is
A B C Y
0 0 0 0
0 0 1 1
* * * 1
* * * 1
SO
A B C Y
0 0 0 0
0 0 1 1
* * * 1
* * * 1
SO
Dipasree said:
1 decade ago
But it is a 3 input nor gate not 2 input.
Arvind kumar said:
1 decade ago
In NOR gate it complement of sum of input signal so high output is 1.
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