The two inputs of a NAND gate are connected together. The resulting circuit is :

Question

Question

This question was previously asked in

NIELIT Scientific Assistant IT 5 Dec 2021 Official Paper

Answer 1

The correct answer is option 3: NOT gate

Key Points

A NAND gate gives output 0 only when both inputs are 1; otherwise, the output is 1.
The Boolean expression for NAND is: \( A \uparrow B = \overline{A \cdot B} \)
If both inputs are connected together, say input A = B, then:
- \( \text{Output} = \overline{A \cdot A} = \overline{A} \)
This is equivalent to the operation of a NOT gate.

Additional Information

OR Gate: Performs logical addition (A + B)
AND Gate: Performs logical multiplication (A ⋅ B)
EX-OR Gate: Outputs 1 only when inputs differ (A ⊕ B)
NOT Gate: Outputs the complement of the input, which is what a NAND gate behaves like when both inputs are same

Hence, the correct answer is: option 3: NOT gate