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  • Question

  • Output 6 of a 74138 octal decoder is selected when it is enabled by a data input of:

    A0 = 1
    A1 = 1
    A2 = 0


  • Options
  • A. True
  • B. False

  • Correct Answer
  • False 

    • MSI Logic Circuits problems

    Search Results

    • 1. In order to select data input I3 of a 74151 eight-line multiplexer, the select inputs must be:

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. A very important attribute of the conditional signal assignment statement is its sequential operation.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. Modern computers transfer data between different devices over a common set of connecting lines called a data bus.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. The outputs of a 7485 four-bit magnitude comparator when the inputs are A = 0110 and B = 1010 are:

      A < B is 1
      A = B is 0
      A > B is 1


    • Options
    • A. True
    • B. False
      • Discuss
    • 5. Basically, a multiplexer changes parallel data inputs to a serial output.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. A device that determines which of two numbers is greater is a comparator.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. All outputs of the 74138 octal decoder are disabled (HIGH) when the enable inputs are:

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. Output 3 of a 74138 octal decoder is selected when it is enabled by a data input of:
      A0 = 1
      A1 = 1
      A2 = 0

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. A four-line multiplexer must have as inputs four data inputs and two select inputs.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. The 74139 dual four-line demultiplexer functions as a demultiplexer if data input is on the line.

    • Options
    • A. True
    • B. False
      • Discuss

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