Which of the following symbol represent the NOR gate?
2021
Which of the following symbol represent the NOR gate?
- A.
Only I
- B.
Only II
- C.
Both I and II
- D.
Neither I nor II
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Correct answer: C
Symbol I: This is the standard NOR gate symbol. It consists of an OR gate (curved input side and pointed output side) followed by a small circle (inversion bubble) at the output. Symbol II: This is an "inverted-input AND gate." According to De Morgan's Law, \overline{A + B} = \overline{A} \cdot \overline{B}. Inverting both inputs of an AND gate produces an output functionally identical to a NOR gate.