The output of an OR gate is connected to both the inputs of a NAND gate. The combination will serve as

  1. AND gate
  2. NOT gate
  3. NAND gate
  4. NOR gate

Answer (Detailed Solution Below)

Option 4 : NOR gate
Free
NDA 01/2025: English Subject Test
30 Qs. 120 Marks 30 Mins

Detailed Solution

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CONCEPT:

  • AND Gate: The Logic AND Gate is a digital logic circuit whose output is 1 (HIGH) only when all the inputs are 1 (HIGH)

A B C = A . B
0 0 0
0 1 0
1 0 0
1 1 1
  • OR Gate: The Logic OR Gate is a digital logic circuit whose output goes HIGH to a logic level 1 only when one or more of its inputs are HIGH

  

A B C = A + B
0 0 0
0 1 1
1 0 1
1 1 1
  • NOT Gate: The Logic NOT Gate is the most basic of all the logic gates and is often referred to as an Inverting Buffer or simply an Inverter.

A B
0 1
1 0
  • NAND Gate: The logic Gate is obtained after adding NOT Gate after AND Gate.

  • NOR Gate: The logic Gate is obtained after adding NOT Gate after OR Gate.

EXPLANATION:

  • Since the output of OR Gate is input for both the inputs of NAND Gates, Both the inputs will be the same.
  • When a NAND gate is connected to the same input it acts as a NOT Gate.
  • The output of NAND Gate will be (same input)

  (Same as NOT Gate)

  • If NOT Gate is added after OR Gate, It will act as NOR Gate.
  • So, The output of an OR gate is connected to both the inputs of a NAND gate. The combination will serve as NOR Gate. Hence the correct answer is option 4.

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