Digital Electronics - Logic Gates - Discussion
Discussion Forum : Logic Gates - General Questions (Q.No. 1)
1.
The output of an AND gate with three inputs, A, B, and C, is HIGH when ________.
Discussion:
51 comments Page 1 of 6.
Disha khare said:
1 decade ago
For AND gate if A, B, C are three inputs than it's output is given by A.B.C .
So output of AND gate will obtain high only when A=1, B=1, C=1.
Because in electronic high means 1 and 1 will obtain if all of three input will high (1).
If any one input will be 0 (low) then output will be low (0).
That's why answer in which A=B=C=1 is correct.
So output of AND gate will obtain high only when A=1, B=1, C=1.
Because in electronic high means 1 and 1 will obtain if all of three input will high (1).
If any one input will be 0 (low) then output will be low (0).
That's why answer in which A=B=C=1 is correct.
Sanjay Sampat said:
1 decade ago
Logically, 1 or high is associated with true in positive logic. Hence if all inputs are true/high/1 then output is true/high/1.
Electrically, 1 or high is associated with +5v in TTL. When switches are in series and all are closed then only high input is available( can be applied) at output.
Electrically, 1 or high is associated with +5v in TTL. When switches are in series and all are closed then only high input is available( can be applied) at output.
Piyush said:
9 years ago
Output of XNOR gate followed by and gate follows comparator circuit. Since in the above question it is easily identifiable that a is greater than b by taking decimal equivalent. So c is the correct answer.
Bincy kousthubham said:
1 decade ago
The output of an AND gate is high (1) only if all the inputs are high (1). The output is low (0) if any one of the input is low (0). The reason is AND gate performs multiplication function.
Akshay Topre said:
1 decade ago
If A=0 & B=0
then A*B=0*0=0 (since AND gate performs multiplication)
If A=1 & B=0
then also A*B=1*0=0.
If A=0 & B=1
then also A*B=0*1=0.
If A=1 & B=1
then only A*B=1*1=1.
then A*B=0*0=0 (since AND gate performs multiplication)
If A=1 & B=0
then also A*B=1*0=0.
If A=0 & B=1
then also A*B=0*1=0.
If A=1 & B=1
then only A*B=1*1=1.
J.s.bharvad said:
1 decade ago
Table for and gate Y=1X1X1 =1 correct answer.
A B C Y
0 0 0 0
1 0 0 0
1 1 0 0
1 1 1 1
A B C Y
0 0 0 0
1 0 0 0
1 1 0 0
1 1 1 1
MD FURQAN ALAM said:
3 years ago
The output of an AND gate is high (1) only when all the inputs are high, even if anyone of the input is low (0) then the output will be low (0).
(2)
M.h.mohamed sheik shaheed said:
1 decade ago
When all the inputs are high the resultant output also high.
If a=0, b=0 then a*b=0.
This is for low output for high a=1, b=1 then a*b=1.
If a=0, b=0 then a*b=0.
This is for low output for high a=1, b=1 then a*b=1.
Manish Kumar said:
1 decade ago
Bcoz in AND GATE Y=A*B then we multiply in AND GATE and we know that to obtain output high.We should give inputs high i,e A=1 B=1 and C=1.
Kathiravan.S said:
1 decade ago
A B C Y
0 0 0 0
0 0 1 0
0 1 0 0
1 0 0 0
1 0 1 0
1 1 0 0
1 1 1 1
If all the inputs are high output is high. Other wise low.
0 0 0 0
0 0 1 0
0 1 0 0
1 0 0 0
1 0 1 0
1 1 0 0
1 1 1 1
If all the inputs are high output is high. Other wise low.
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers