Question

NAND gate with positive logic will operate as

• A. NOR with negative logic
• B. AND with negative logic output
• C. AND with negative logic
• D. OR with negative logic input

Hint:

NAND ≡ OR with inverted inputs (De Morgan).

Answer 1

The Correct Option is D

Concept: Logic equivalence changes when switching between positive and negative logic.

Step 1: NAND definition \[ Y = (AB)' \]

Step 2: Apply De Morgan’s theorem \[ (AB)' = A' + B' \]

Step 3: Interpretation Equivalent to OR gate with complemented inputs.

Step 4: Negative logic view Complemented inputs correspond to negative logic inputs.

Step 5: Conclusion \[ \boxed{\text{OR with negative logic input}} \]

Final Answer: \[ \boxed{(D)} \]