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  • Question
  • What is one disadvantage of an S-R flip-flop?


  • Options
  • A. It has no Enable input.
  • B. It has a RACE condition.
  • C. It has no clock input.
  • D. It has only a single output.

  • Correct Answer
  • It has a RACE condition. 


  • Flip-Flops and Timers problems


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    • 1. The equation for the output frequency of a 555 timer operating in the astable mode is: .
      What value of C1 will be required if R1 = 1 kΩ, R2 = 1 kΩ, and f = 1 kHz?

    • Options
    • A. 0.33 µF
    • B. 0.48 µF
    • C. 480 µF
    • D. 33 nF
    • Discuss
    • 2. The 555 timer can be used in which of the following configurations?

    • Options
    • A. astable, monostable
    • B. monostable, bistable
    • C. astable, toggled
    • D. bistable, tristable
    • Discuss
    • 3. One example of the use of an S-R flip-flop is as a(n):

    • Options
    • A. transition pulse generator
    • B. astable oscillator
    • C. racer
    • D. switch debouncer
    • Discuss
    • 4. The truth table for an S-R flip-flop has how many VALID entries?

    • Options
    • A. 3
    • B. 1
    • C. 4
    • D. 2
    • Discuss
    • 5. A series of gradually decreasing sine wave oscillations is called:

    • Options
    • A. ringing
    • B. slew
    • C. overshooting
    • D. undershooting
    • Discuss
    • 6. An astable multivibrator is a circuit that:

    • Options
    • A. has two stable states
    • B. is free-running
    • C. produces a continuous output signal
    • D. is free-running and produces a continuous output signal
    • Discuss
    • 7. What is another name for a one-shot?

    • Options
    • A. monostable
    • B. bistable
    • C. astable
    • D. tristable
    • Discuss
    • 8. A basic S-R flip-flop can be constructed by cross-coupling which basic logic gates?

    • Options
    • A. AND or OR gates
    • B. XOR or XNOR gates
    • C. NOR or NAND gates
    • D. AND or NOR gates
    • Discuss
    • 9. If both inputs of an S-R NAND latch are LOW, what will happen to the output?

    • Options
    • A. The output would become unpredictable.
    • B. The output will toggle.
    • C. The output will reset.
    • D. No change will occur in the output.
    • Discuss
    • 10. What is the significance of the J and K terminals on the J-K flip-flop?

    • Options
    • A. There is no known significance in their designations.
    • B. The J represents "jump," which is how the Q output reacts whenever the clock goes HIGH and the J input is also HIGH.
    • C. The letters represent the initials of Johnson and King, the co-inventors of the J-K flip-flop.
    • D. All of the other letters of the alphabet are already in use.
    • Discuss


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