Topic: Digital Logic
Which of the following definitions is true
(i) A digital multiplexer takes one input from many inputs and outputs the selected one
(ii) Four select lines are required for 1-16 demultiplexer
(iii) Eight OR gates are required to implement an octal to binary encoder
- A. (i) and (ii)
- B. (ii) and (iii)
- C. (i) alone
- D. none of the above
Answer: A. (i) and (ii)
Explanation: Statement (i) correctly defines a multiplexer. Statement (ii) is correct because $2^{4} = 16$, requiring 4 select lines. Statement (iii) is false because an octal to binary (8-to-3) encoder typically uses only three 4-input OR gates, not eight.