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  • Question

  • Based on the indications of probe A in the figure given below, what is wrong, if anything, with the circuit?

    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.

  • Correct Answer
  • Nothing appears to be wrong at that point. 

    • Combinational Logic Circuits problems

    Search Results

    • 1. Which of the following logic expressions represents the logic diagram shown?


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


    • Options
    • A. a
    • B. b
    • C. c
    • D. d
      • Discuss
    • 3. 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
    • 4. The simplest equation which implements the K-map shown below is:


    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 5. In HDL, LITERALS is/are:

    • Options
    • A. digital systems.
    • B. scalars.
    • C. binary coded decimals.
    • D. a numbering system.
      • Discuss
    • 6. 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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