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  • Question

  • How many 1-of-16 decoders are required for decoding a 7-bit binary number?


  • Options
  • A. 5
  • B. 6
  • C. 7
  • D. 8

  • Correct Answer
  • 8 

    • Tags: Bank Exams

    Combinational Logic Circuits problems

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    • 1. For the device shown here, let all D inputs be LOW, both S inputs be HIGH, and the input be HIGH. What is the status of the Y output?


    • Options
    • A. LOW
    • B. HIGH
    • C. Don't Care
    • D. Cannot be determined
      • Discuss
    • 2. For the device shown here, let all D inputs be LOW, both S inputs be HIGH, and the input be LOW. What is the status of the Y output?


    • Options
    • A. LOW
    • B. HIGH
    • C. Don't Care
    • D. Cannot be determined
      • Discuss
    • 3. Which of the circuits in figure (a to d) is the sum-of-products implementation of figure (e)?


    • Options
    • A. a
    • B. b
    • C. c
    • D. d
      • Discuss
    • 4. A logic probe is placed on the output of a gate and the display indicator is dim. A pulser is used on each of the input terminals, but the output indication does not change. What is wrong?

    • Options
    • A. The output of the gate appears to be open.
    • B. The dim indication on the logic probe indicates that the supply voltage is probably low.
    • C. The dim indication is a result of a bad ground connection on the logic probe.
    • D. The gate may be a tristate device.
      • Discuss
    • 5. For the device shown here, assume the D input is LOW, both S inputs are LOW, and the input is LOW. What is the status of the outputs?


    • Options
    • A. All are HIGH.
    • B. All are LOW.
    • C. All but are LOW.
    • D. All but are HIGH.
      • Discuss
    • 6. What is the indication of a short to ground in the output of a driving gate?

    • Options
    • A. Only the output of the defective gate is affected.
    • B. There is a signal loss to all load gates.
    • C. The node may be stuck in either the HIGH or the LOW state.
    • D. The affected node will be stuck in the HIGH state.
      • Discuss
    • 7. When adding an even parity bit to the code 110010, the result is ________.

    • Options
    • A. 1110010
    • B. 1111001
    • C. 110010
    • D. 001101
      • Discuss
    • 8. The design concept of using building blocks of circuits in a PLD program is called a(n):

    • Options
    • A. hierarchical design.
    • B. architectural design.
    • C. digital design.
    • D. verilog.
      • Discuss
    • 9. The carry propagation can be expressed as ________.

    • Options
    • A. Cp = AB
    • B. Cp = A + B
    • C.
    • D.
      • Discuss
    • 10. How many flip-flops are in the 7475 IC?

    • Options
    • A. 1
    • B. 2
    • C. 4
    • D. 8
      • Discuss

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