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 2 of 4.
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
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
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
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
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.
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.
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.
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
Aarti said:
1 decade ago
NOR is OR+INVERT so OR will be 1 when any one of inputs is '1' but in NOR output will be inverted OR. So when all inputs are '0' OR output will be '0' and its inverted means NOR output will be '1'.
Nandi said:
1 decade ago
But do we have more than 2 input NOR gate?
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