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

  • Four positive edge-triggered D flip-flops are used to store a 4-bit binary number as shown below. Determine if the circuit is functioning properly, and if not, what might be wrong.

    Four positive edge-triggered D flip-flops are used to store a 4-bit binary number as shown below. De


  • Options
  • A. The circuit is functioning properly.
  • B. Q2 is incorrect; the flip-flop is probably bad.
  • C. The input to flip-flop 3 (D2) is probably wrong; check the source of D2.
  • D. A bad connection probably exists between FF-3 and FF-4, causing FF-3 not to reset.

  • Correct Answer
  • Q2 is incorrect; the flip-flop is probably bad. 

    • More questions

    • 1. A retriggerable one-shot has a pulse width of 10 ms; 3 ms after being triggered, another trigger pulse is applied. The resulting output pulse will be ________ mS.

    • Options
    • A. 3
    • B. 7
    • C. 10
    • D. 13
      • Discuss
    • 2. The device shown here is most likely a ________.


    • Options
    • A. comparator
    • B. multiplexer
    • C. demultiplexer
    • D. parity generator
      • Discuss
    • 3. The symbol shown below is for a 2-input NAND gate.


    • Options
    • A. True
    • B. False
      • Discuss
    • 4. In HDL, one of the strategies used in strategic planning is to find a way to test each piece of the project.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. A D latch has one data-input line.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. Decimal 474 is ________ in BCD.

    • Options
    • A. 0100 0111 0100
    • B. 0100 1011 0101
    • C. 0100 1001 0011
    • D. 0110 1011 1001
      • Discuss
    • 7. Each hexadecimal digit converts to ________ binary digits.

    • Options
    • A. four
    • B. eight
    • C. 12
    • D. six
      • Discuss
    • 8. Determine the values of A, B, C, and D that make the product term equal to 1.

    • Options
    • A. A = 0, B = 1, C = 0, D = 1
    • B. A = 0, B = 0, C = 0, D = 1
    • C. A = 1, B = 1, C = 1, D = 1
    • D. A = 0, B = 0, C = 1, D = 0
      • Discuss
    • 9. Another name for a multiplexer is ________.

    • Options
    • A. encoder
    • B. decoder
    • C. code converter
    • D. data selector
      • Discuss
    • 10. All decade counters are BCD counters.

    • Options
    • A. True
    • B. False
      • Discuss

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