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  • Question

  • The equation for the output frequency of a 555 timer operating in the astable mode is: The equation for the output frequency of a 555 timer operating in the astable mode is: . What value .
    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

  • Correct Answer
  • 0.48 µF 

    • Flip-Flops and Timers problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. The truth table for an S-R flip-flop has how many VALID entries?

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

    • Options
    • A. ringing
    • B. slew
    • C. overshooting
    • D. undershooting
      • Discuss
    • 5. Which test equipment best allows a comparison between input and output signals?

    • Options
    • A. an oscilloscope
    • B. a logic probe
    • C. a spectrum analyzer
    • D. a multitrace oscilloscope
      • Discuss
    • 6. 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.
      • Discuss
    • 7. 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
    • 8. What is another name for a one-shot?

    • Options
    • A. monostable
    • B. bistable
    • C. astable
    • D. tristable
      • Discuss
    • 9. 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
    • 10. 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

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