Gate symbol recognition (textual recovery): A 2-input NAND gate is represented by an AND-gate shape with a small inversion bubble at the output. Evaluate this description.

Digital Electronics Boolean Algebra and Logic Simplification Difficulty: Easy
Choose an option
  • A
    Correct
  • B
    Incorrect
  • C
    Only correct in IEEE symbols, not IEC
  • D
    Ambiguous without pin numbers
  • E
    Insufficient information

Answer

Correct Answer: Correct

Explanation

Introduction / Context:The original item referenced a figure. Applying the recovery policy, we restate a standard textual description: a NAND gate is commonly drawn as an AND gate with an inversion bubble on its output, indicating logical negation of the AND function.

Given Data / Assumptions:

  • 2-input NAND gate.
  • Standard schematic symbol conventions.

Concept / Approach:NAND implements NOT( A * B ). Symbolically, the AND gate shape denotes the product operation while the output bubble indicates inversion. This depiction is consistent across common drawing styles (IEEE/IEC) though graphic styles may vary.

Step-by-Step Solution:

Step 1: Recognize the base AND shape.Step 2: Identify the output bubble as inversion.Step 3: Conclude that the described symbol is a NAND gate.

Verification / Alternative check:Truth table of NAND equals the complement of AND; the bubble signifies this complement explicitly on the output node.

Why Other Options Are Wrong:

Incorrect: Conflicts with standard symbology.Only correct in IEEE symbols: IEC variants also use explicit inversion marks.Ambiguous/Insufficient: The description is precise enough.

Common Pitfalls:Confusing input bubbles (which denote inversion at inputs) with the single output bubble for NAND.

Final Answer:Correct

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