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Code Converters and Multiplexers (Digital Electronics) Question and Answers-Page first

Code Converters and Multiplexers problems


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  • 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     

  • 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     

  • 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     

  • 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     

  • 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     

  • 6. How many outputs are on a BCD decoder?

  • Options
  • A. 4
  • B. 16
  • C. 8
  • D. 10

  •           Discuss     

  • 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     

  • 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     

  • 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     

  • 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     


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