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  • Question
  • 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.

  • Correct Answer
  • A bubble indicates active-LOW. 


  • Code Converters and Multiplexers problems


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

    • Options
    • A. 4
    • B. 16
    • C. 8
    • D. 10
    • Discuss
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. Which of the following is not a weighted value positional numbering system:

    • Options
    • A. hexadecimal
    • B. binary-coded decimal
    • C. binary
    • D. octal
    • Discuss
    • 6. 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
    • 7. How many possible outputs would a decoder have with a 6-bit binary input?

    • Options
    • A. 16
    • B. 32
    • C. 64
    • D. 128
    • Discuss
    • 8. 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
    • 9. Which digital system translates coded characters into a more useful form?

    • Options
    • A. encoder
    • B. display
    • C. counter
    • D. decoder
    • Discuss
    • 10. A basic multiplexer principle can be demonstrated through the use of a:

    • Options
    • A. single-pole relay
    • B. DPDT switch
    • C. rotary switch
    • D. linear stepper
    • Discuss


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