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Combinational Logic Circuits problems

  • 1. The simplest equation which implements the K-map shown below is:

    Digital Electronics Combinational Logic Circuits: The simplest equation which implements the K-map shown below is:


  • Options
  • A.
  • B.
  • C.
  • D.
    • Discuss
  • 2. For a two-input XNOR gate, with the input waveforms as shown below, which output waveform is correct?

    Digital Electronics Combinational Logic Circuits: For a two-input XNOR gate, with the input waveforms as shown below, which output waveform is correct


  • Options
  • A. a
  • B. b
  • C. c
  • D. d
    • Discuss
  • 3. Which of the K-maps given below represents the expression X = AC + BC + B?

    Digital Electronics Combinational Logic Circuits: Which of the K-maps given below represents the expression X = AC + BC + B


  • Options
  • A. a
  • B. b
  • C. c
  • D. d
    • Discuss
  • 4. Which of the following logic expressions represents the logic diagram shown?

    Digital Electronics Combinational Logic Circuits: Which of the following logic expressions represents the logic diagram shown?


  • Options
  • A.
  • B.
  • C.
  • D.
    • Discuss
  • 5. Based on the indications of probe A in the figure given below, what is wrong, if anything, with the circuit?

    Digital Electronics Combinational Logic Circuits: Based on the indications of probe A in the figure given below, what is wrong, if anything, with the


  • Options
  • A. The logic probe is unable to determine the state of the circuit at that point and is blinking to alert the technician to the problem.
  • B. The output appears to be shorted to Vcc, but is being pulsed by the pulser.
  • C. The output appears to be LOW, but is being pulsed by the pulser.
  • D. Nothing appears to be wrong at that point.
    • Discuss
  • 6. The device shown here is most likely a ________.

    Digital Electronics Combinational Logic Circuits: The device shown here is most likely a ________.


  • Options
  • A. comparator
  • B. multiplexer
  • C. demultiplexer
  • D. parity generator
    • Discuss
  • 7. How many 3-line-to-8-line decoders are required for a 1-of-32 decoder?

  • Options
  • A. 1
  • B. 2
  • C. 4
  • D. 8
    • Discuss
  • 8. Which of the following expressions is in the product-of-sums form?

  • Options
  • A. (A + B)(C + D)
  • B. (AB)(CD)
  • C. AB(CD)
  • D. AB + CD
    • Discuss
  • 9. A 74HC147 priority encoder has ten active-LOW inputs and four active-LOW outputs. What would be the state of the four outputs if inputs 4 and 5 are LOW and all other inputs are HIGH?

  • Options
  • A.
  • B.
  • C.
  • D.
    • Discuss
  • 10. A decoder can be used as a demultiplexer by ________.

  • Options
  • A. tying all enable pins LOW
  • B. tying all data-select lines LOW
  • C. tying all data-select lines HIGH
  • D. using the input lines for data selection and an enable line for data input
    • Discuss

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