Digital Electronics - Ex-OR and Ex-NOR Gates - Discussion

Discussion :: Ex-OR and Ex-NOR Gates - General Questions (Q.No.3)

3. 

A logic circuit that provides a HIGH output if one input or the other input, but not both, is HIGH, is a(n):

[A]. Ex-NOR gate
[B]. OR gate
[C]. Ex-OR gate
[D]. NAND gate

Answer: Option C

Explanation:

No answer description available for this question.

Vikalp Shrivastava said: (Nov 11, 2011)  
OR gate, nand gate also provides high output when its one input is low so how you can tell only ex-or gate. And combinations for nand are 0, 1=1; 1, 0=1 and for or gate are 0+1=1; 1+0=1.

Thenmozhi Sundaram said: (Aug 27, 2013)  
@Vikalp Shrivastava, understand the question correctly.

The output has to be '1' when only one input is '1'and the other input has to be '0'. both inputs are NOT low or high simultaneously as per the question given.

Truth table for EXOR gate:

in1 in2 out
0 0 0
0 1 1
1 0 1
1 1 0

Truth table for OR gate:

in1 in2 out
0 0 0
0 1 1
1 0 1
1 1 1(condition violated-out is 1 when both inputs are 1)

Truth table for NAND gate:

in1 in2 out
0 0 1(condition violated-out is 1 when both inputs are 0)
0 1 1
1 0 1
1 1 0

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