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  • Question
  • For the following conditions on a 7485 magnitude comparator, what will be the state of each of the three outputs?

    A0 = 0 B0 = 1 IA < B = 0
    A1 = 1 B1 = 0 IA = B = 1
    A2 = 1 B2 = 0 IA > B = 0
    A3 = 0 B3 = 0  


  • Options
  • A. A = B = 0, A < B = 0, A > B = 1
  • B. A = B = 0, A < B = 1, A > B = 0
  • C. A = B = 1, A < B = 0, A > B = 0
  • D. A = B = 0, A < B = 0, A > B = 0

  • Correct Answer
  • A = B = 0, A < B = 0, A > B = 1 


  • Code Converters and Multiplexers problems


    Search Results


    • 1. One multiplexer can take the place of:

    • Options
    • A. several SSI logic gates
    • B. combinational logic circuits
    • C. several Ex-NOR gates
    • D. several SSI logic gates or combinational logic circuits
    • Discuss
    • 2. A principle regarding most IC decoders is that when the correct input is present, the related output will switch:

    • Options
    • A. active-HIGH
    • B. to a high impedance
    • C. to an open
    • D. active-LOW
    • Discuss
    • 3. A BCD decoder will have how many rows in its truth table?

    • Options
    • A. 10
    • B. 9
    • C. 8
    • D. 3
    • Discuss
    • 4. If two inputs are active on a priority encoder, which will be coded on the output?

    • Options
    • A. the higher value
    • B. the lower value
    • C. neither of the inputs
    • D. both of the inputs
    • Discuss
    • 5. One way to convert BCD to binary using the hardware approach is:

    • Options
    • A. with MSI IC circuits
    • B. with a keyboard encoder
    • C. with an ALU
    • D. UART
    • Discuss
    • 6. The expansion inputs to a comparator are used for expansion to a(n):

    • Options
    • A. 4-bit system
    • B. 8-bit system
    • C. BCD system
    • D. counter system
    • Discuss
    • 7. Why is the Gray code more practical to use when coding the position of a rotating shaft?

    • Options
    • A. All digits change between counts.
    • B. Two digits change between counts.
    • C. Only one digit changes between counts.
    • Discuss
    • 8. A look-up table is simply a truth table with all the possible output connections listed with their desired input response.

    • Options
    • A. True
    • B. False
    • Discuss
    • 9. Which of the following testing procedures has one or more external moving parts?

    • Options
    • A. Bed-of-nails
    • B. Flying probe
    • C. EXTEST
    • D. Boundary scan
    • Discuss
    • 10. PIA is an acronym for ________.

    • Options
    • A. Programmable Interface Array
    • B. Post Integrated Array
    • C. Programmable Input Array
    • D. Programmable Interconnect Array
    • Discuss


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