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Home ‣ Digital Electronics ‣ Flip-Flops See What Others Are Saying!
  • Question

  • When the output of the NOR gate S-R flip-flop is in the HOLD state (no change), the inputs are ________.


  • Options
  • A. S = 1, R = 1
  • B. S = 1, R = 0
  • C. S = 0, R = 1
  • D. S = 0, R = 0

  • Correct Answer
  • S = 0, R = 0 

    • More questions

    • 1. What is the status of the inputs S0, S1, and S2 of the 74151 eight-line multiplexer in order for the output Y to be a copy of input I5?

    • Options
    • A. S0 = 0, S1 = 1, S2 = 0
    • B. S0 = 0, S1 = 0, S2 = 1
    • C. S0 = 1, S1 = 1, S2 = 0
    • D. S0 = 1, S1 = 0, S2 = 1
      • Discuss
    • 2. The circuit shown below is a(n) ________.


    • Options
    • A. 4-bit magnitude comparator
    • B. 4-bit half adder
    • C. 8-bit comparator
    • D. 8-bit binary adder
      • Discuss
    • 3. A logic probe is placed on the input of a digital circuit and the probe lamp blinks slowly, indicating ________.

    • Options
    • A. that an open or bad logic level exists
    • B. a high level output
    • C. a high-frequency pulse train
    • D. that the supply voltage is low
      • Discuss
    • 4. Most look-up tables in field-programmable gate arrays (FGPAs) use ________ inputs, resulting in ________ possible outputs.

    • Options
    • A. 4,16
    • B. 8,16
    • C. 4,12
    • D. 6,12
      • Discuss
    • 5. Half-adders can be combined to form a full-adder with no additional gates.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. A PAL consists of an array of fixed AND gates that are connected to a programmable array of OR gates.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. In a Gray code, each number is 3 greater than the binary representation of that number.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. The output of a gated S-R flip-flop changes only if the:

    • Options
    • A. flip-flop is set
    • B. control input data has changed
    • C. flip-flop is reset
    • D. input data has no change
      • Discuss
    • 9. A decoder converts ________.

    • Options
    • A. noncoded information into coded form
    • B. coded information into noncoded form
    • C. HIGHs to LOWs
    • D. LOWs to HIGHs
      • Discuss
    • 10. Give the decimal value of binary 10010.

    • Options
    • A. 610
    • B. 910
    • C. 1810
    • D. 2010
      • Discuss

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