Which of the following is a limitation of a half-adder circuit?

Options

  • A. It cannot generate Sum
  • B. It cannot generate Carry
  • C. It cannot accept a Carry-in input
  • D. It requires three input bits
  • E. None of the above

Correct Answer (Detailed Explanation is Below)

C. It cannot accept a Carry-in input

Detailed Explanation

Correct Answer: (C) It cannot accept a Carry-in input
A half-adder can add only two input bits. It has no input for an incoming carry from a previous stage. A full-adder is used when Carry-in must also be considered.