Digital Electronics - Logic Gates - Discussion

6. 

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

[A]. A = 0, B = 0, C = 0
[B]. A = 0, B = 0, C = 1
[C]. A = 0, B = 1, C = 1
[D]. all of the above

Answer: Option A

Explanation:

No answer description available for this question.

Bhavani said: (Dec 31, 2010)  
Because OR gate only low value in one only

Akshay Topre said: (Jan 3, 2011)  
Bcoz OR gate performs addition between two variables.
If we want low output, then all variables values should be low, if any one of d value becomes high, then the output of OR gate will be high.

Anshuman said: (Jul 29, 2011)  
Output of OR gate is sum of inputs so.

When the inputs are 0, 0 and 0 than output is also ZERO.

Varun Pathania said: (Oct 2, 2011)  
Its answer is option a not d because in or gate if any input is one than output is also one.

Manish Kumar said: (Oct 5, 2011)  
Bcoz in OR GATE addition is performed between two variables. A/q to queston output is low. In OR GATE output is low in one condition when all inputs are low. Y=A+B+C when the inputs are 0 then output will be 0.

Manish Kumar said: (Oct 5, 2011)  
Because in OR GATE addition is performed between two variables. A/q to queston output is low. In OR GATE output is low in one condition when all inputs are low. Y=A+B+C when the inputs are 0 then output will be 0.

Sathish said: (Jan 20, 2012)  
Here give low value only for OR gate so, output is low, As per OR Gate Truth table.

Mohammad said: (Dec 14, 2014)  
A B C OUTPUT(A+B+C) TRUTH TABLE.

-- -- -- ------------
0 0 0 0
0 0 1 1
0 1 0 1
0 1 1 1
1 0 0 1
1 0 1 1
1 1 0 1
1 1 1 1

Siva said: (Jul 24, 2018)  
A B C OUTPUT(A+B+C) TRUTH TABLE.

-- -- -- ------------
0 0 0 0
0 0 1 1
0 1 0 1
0 1 1 1
1 0 0 1
1 0 1 1
1 1 0 1
1 1 1 1

Siva said: (Jul 24, 2018)  
Because OR gate only low value in one only.

Dimpu said: (Mar 1, 2019)  
OR gate means +operation. So, the output is low. When all inputs are low (0).

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