Code Converters and Multiplexers problems
- 1. How is an encoder different from a decoder?
Options- A. The output of an encoder is a binary code for 1-of-N input.
- B. The output of a decoder is a binary code for 1-of-N input. Discuss
Correct Answer: The output of an encoder is a binary code for 1-of-N input.
- 2. Which of the following is not a weighted value positional numbering system:
Options- A. hexadecimal
- B. binary-coded decimal
- C. binary
- D. octal Discuss
Correct Answer: binary-coded decimal
- 3. What do the mathematical symbols A < b and A > B mean?
Options- A. A < B means A is greater than B. A > B means A is less than B.
- B. A > B means A is less than B. A < B means A is greater than B.
- C. A < B means A is less than B. A > B means A is greater than B. Discuss
Correct Answer: A < B means A is less than B. A > B means A is greater than B.
- 4. What is the status of the inputs S0, S1, and S2 of the 74151 eight-line multiplexer in order for the output Y to be a copy of input I5?
Options- A. S0 = 0, S1 = 1, S2 = 0
- B. S0 = 0, S1 = 0, S2 = 1
- C. S0 = 1, S1 = 1, S2 = 0
- D. S0 = 1, S1 = 0, S2 = 1 Discuss
Correct Answer: S0 = 1, S1 = 0, S2 = 1
- 5. Most demultiplexers facilitate which type of conversion?
Options- A. decimal-to-hexadecimal
- B. single input, multiple outputs
- C. ac to dc
- D. odd parity to even parity Discuss
Correct Answer: single input, multiple outputs
- 6. How many outputs are on a BCD decoder?
Options- A. 4
- B. 16
- C. 8
- D. 10 Discuss
Correct Answer: 10
- 7. How can the active condition (HIGH or LOW) or the decoder output be determined from the logic symbol?
Options- A. A bubble indicates active-HIGH.
- B. A bubble indicates active-LOW.
- C. A square indicates active-HIGH.
- D. A square indicates active-LOW. Discuss
Correct Answer: A bubble indicates active-LOW.
- 8. How many 74184 BCD-to-binary converters would be required to convert two complete BCD digits to a binary number?
Options- A. 8
- B. 4
- C. 2
- D. 1 Discuss
Correct Answer: 2
- 9. How many possible outputs would a decoder have with a 6-bit binary input?
Options- A. 16
- B. 32
- C. 64
- D. 128 Discuss
Correct Answer: 64
- 10. One application of a digital multiplexer is to facilitate:
Options- A. data generation
- B. serial-to-parallel conversion
- C. parity checking
- D. data selector Discuss
Correct Answer: data selector
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