# Electronics and Communication Engineering - Digital Electronics - Discussion

3.

An OR gate has 4 inputs. One input is high and the other three are low. The output

 [A]. is low [B]. is high [C]. is alternately high and low [D]. may be high or low depending on relative magnitude of inputs

Explanation:

In OR any input high means high output.

 Sangee said: (Jul 17, 2014) If all of the input is 0 then the output is low. If any one of the input is high output becomes high.

 Lata said: (Sep 23, 2014) Explain deeply and explain with symbol and property.

 Dilip N said: (Feb 13, 2015) Inputs Outputs A | B | C | D | Y 0 | 0 | 0 | 0 | 0 1 | X | X | X | 1 X | 1 | X | X | 1 X | X | 1 | X | 1 X | X | X | 1 | 1 X = don't care value(X = 0/1).

 Sgb said: (Nov 23, 2016) Output=1.

 Harish said: (Nov 25, 2016) Suppose, in 4 inputs one input is low remaining 3 are high what is the output?

 Manjuladevi said: (Mar 23, 2017) @Harish. The Output is high, because in OR any input is high means output is high.

 Anusha said: (Aug 25, 2017) Hi, everyone. Suppose take the four inputs as, a ,b ,c ,d. OR is nothing but simply add all the inputs. They have said that one input is high So, let us take it as a=1, and 3 of them are 0. b=c=d=0. OR operation: a+b+c+d=1+0+0+0 Now we get 1. It is the final answer.

 Badhshah said: (Jan 6, 2018) In the OR operation. If the two inputs are high then the output is high. For example:-take two inputs A, B &Output Y. A B Y 0 0 0 0 1 1 1 0 1 1 1 1 So if the three inputs are high then, 1OR1OR1=. first, do for two inputs 1OR1=1. And now do for another one with this answer1OR1=1, 1OR1OR1=1.

 Haseeb Chaudhry said: (Feb 3, 2018) a b c d 1 0 0 0 = 1 for OR gate. In OR gate even one input high causes high.

 Giriii said: (Sep 5, 2018) One or more of its inputs are high and to produce high on its output. So, the output is "high". Example:0+0=0, 0+1=1, 1+0=1, 1+1=1.

 Nagababu said: (Jan 3, 2020) How it's high? Please explain.