Digital Electronics - Logic Gates - Discussion

1. 

The output of an AND gate with three inputs, A, B, and C, is HIGH when ________.

[A]. A = 1, B = 1, C = 0
[B]. A = 0, B = 0, C = 0
[C]. A = 1, B = 1, C = 1
[D]. A = 1, B = 0, C = 1

Answer: Option C

Explanation:

No answer description available for this question.

Jagan said: (Dec 2, 2010)  
Output of an And gate is high when all inputs are high or 1.

Suraj K S said: (Dec 17, 2010)  
A*B=1*1=1
C*A*B=1*1=1

Akshay Topre said: (Jan 3, 2011)  
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.

N.Shirish said: (Jan 29, 2011)  
Output of an AND gate is high when all inputs are high a=1, b=1, c=1.

Output of AND gate is = A*B*C = 1*1*1 = 1.

Purushothaman R said: (Mar 3, 2011)  
simple logic for xor ...

suppose A xor B = AB'+BA'

That is if both A and B Value is same then result is same

Syed Asif said: (Mar 4, 2011)  
Yes above said by all is correct.

Aaaa said: (Mar 10, 2011)  
For the output of and gate to be high we need all 1 because by the combination of any 0 in case of and we get a 0 that is low output.

Premalatha said: (Mar 24, 2011)  
AND Gate is enable only when their all inputs are high.

Sathi.Repala@Gmail.Com said: (May 12, 2011)  
Only if all the inputs are high then only the and gate output is high.

Kailash said: (Aug 14, 2011)  
In AND gate Y=A*B.

When A=HIGH & B=HIGH then the output Y=HIGH.

Edwin said: (Aug 26, 2011)  
Smart answer::
Output of and gate is high when all the inputs of the and gate is high.

Rena said: (Sep 27, 2011)  
A B O/P
0 0 0
0 1 0
1 0 0
1 1 1

For AND gate O/P is high, when all inputs are high.

Manish Kumar said: (Oct 5, 2011)  
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.

Shekhar Manjrekar said: (Dec 3, 2011)  
The AND Gate function is to multiply
exmaple
input output
0 0
1 1

Kathiravan.S said: (Dec 17, 2011)  
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.

Rashi said: (Dec 30, 2011)  
Table for AND gate

A B Y
0 0 0
0 1 0
1 0 0
1 1 1

Output is high only when both the inputs are high.

Disha Khare said: (Jun 13, 2012)  
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.

Shubhangi said: (Jul 6, 2012)  
Output of an AND gate is high when all inputs are high a=1, b=1, c=1.

Kader Sarker said: (Jul 6, 2012)  
When there all the inputs of an AND gate are 1 or HIGH then the output will be HIGH or 1.

Venkatesh said: (Aug 23, 2012)  
And is gate which multiply all the inputs so all inputs should be high to get o/p as high.

Shamsi Sani Gumel said: (Jan 8, 2013)  
When the all input of AND gate are high or 1, then the output will 1 or high.

Bincy Kousthubham said: (Feb 14, 2013)  
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.

Vilas Awasarmol said: (May 4, 2013)  
When all input are high then output is high.

Prashant Kumar Sharma said: (Jul 5, 2013)  
There are three input present and all have high value =1.

So in in and operation 1*1*1=1.

It is a high.

M.H.Mohamed Sheik Shaheed said: (Jul 31, 2013)  
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.

J.S.Bharvad said: (Aug 1, 2013)  
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

Sanjay Sampat said: (Oct 1, 2013)  
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.

Vinidha said: (Feb 25, 2014)  
Output of AND gates are high when all the inputs are 1. If any of the input is 0, the output will be 0.

Mayoosha K R said: (Jul 9, 2014)  
The output of an AND gate only high when all its inputs are high otherwise it is low.

Sital said: (Aug 11, 2014)  
The AND gate gives high output when all the inputs to the gate are high.

Rajesh Kumar Shrivastav said: (Aug 20, 2014)  
The output of an AND gate is high when all the inputs are high.

Jay-T said: (Oct 31, 2014)  
An output on an AND gate is only high if only all the inputs are high.

Nanmukilan K said: (Jul 11, 2015)  
Output of the AND gate will high, only if all the inputs are 1.

(i.e) a=1, b=1, c=1.

Rahul Jonjare said: (Aug 6, 2016)  
The output of an exclusive-nor gate is 1. Which input combination is correct?

A) a=1, b=0
B) a=0, b=1
C) a=0, b=0
D) none of these.

Prashant said: (Aug 12, 2016)  
The output of AND gate will high when all the input will be high or equal to 1.

Kiruthika said: (Sep 7, 2016)  
The output of the AND gate high when both the input is high.

Ammulu said: (Sep 13, 2016)  
If any one of the input is low output is low and if all the inputs are high output is high.

Amit Kandari said: (Sep 20, 2016)  
Because this conditions is given by and gate.

Chandu said: (Oct 21, 2016)  
When A=0, B=0 then C=1.The two input logic gate is?

Please tell me the answer.

Piyush said: (Mar 8, 2017)  
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.

Sumitha said: (Apr 25, 2017)  
The output of AND gate is high and all the inputs are high or 1.

Subhajit Saha said: (Jul 15, 2017)  
IF,
A=0,B=0,C=0 - 0
A=1,B=0,C=0 - 0
A=0,B=1, C=0 -0
A=1,B=1,C=0 - 0
A=1,B=0, C=1 -0
ONLY,
A=1,B=1,C=1 - 1(HIGH) BECAUSE A*B*C.

Aditya Das said: (Sep 13, 2017)  
Output of an AND gate is high when all inputs are high a=1, b=1, c=1.

Rehan said: (Jul 18, 2018)  
The Logic of and gate is when all the 3 inputs are high output is high when any one input is low output is low.

Suvarnapooja said: (Jan 17, 2019)  
In AND gate any 2 IP are high op is high.

George said: (Dec 13, 2019)  
The question are encouraging and need more of them.

Sameer Qcd said: (Apr 8, 2020)  
And gate.

A B Y
0 0 0
0 1 0
1 0 0
1 1 1.

The output is high only when both the inputs are high.

Pavan said: (May 24, 2020)  
If any of the input is low then AND gate output is low.

Hassam Bhutto said: (Jun 4, 2020)  
If any of the input is low then what happens?

Vinay said: (Oct 8, 2020)  
A B C -> A. B.C
1 1 1 -> 1.

So, the right answer is option C.

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