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Home ‣ Digital Electronics ‣ Multivibrators and 555 Timer Comments
- Question
Triggering a retriggerable one shot during pulse generation will:
Options- A. time out the original pulse
- B. extend the pulse to this trigger width
- C. have no effect
- D. double the original pulse width
- Correct Answer
- extend the pulse to this trigger width
- 1. A 22-kΩ resistor and a 0.02-µF capacitor are connected in series to a 5-V source. How long will it take the capacitor to charge to 3.4 V?
Options- A. 0.44 ms
- B. 0.501 ms
- C. 0.66 ms
- D. 0.70 ms Discuss
- 2. Is the circuit given below an astable multivibrator or a monostable multivibrator?
Options- A. monostable
- B. astable Discuss
- 3. What is the function of the comparators in the 555 timer circuit?
Options- A. to compare the output voltages to the internal voltage divider
- B. to compare the input voltages to the internal voltage divider
- C. to compare the output voltages to the external voltage divider
- D. to compare the input voltages to the external voltage divider Discuss
- 4. The ________ is defined as the time the output is active divided by the total period of the output signal.
Options- A. on time
- B. off time
- C. duty cycle
- D. active ratio Discuss
- 5. If the resistor in the Schmitt trigger astable multivibrator is a variable resistor, what part of the output voltage waveform will change when the resistance is changed?
Options- A. the shape of the waveform
- B. the amplitude of the waveform
- C. the period of the waveform
- D. none of the above Discuss
- 6. The monostable multivibrator circuit is not an oscillator because ________.
Options- A. its output switches between two states
- B. it requires a trigger to obtain an output signal
- C. it requires a sine wave input signal
- D. the circuit does not require a dc power supply Discuss
- 7. Does the 74123 one shot have an internal timing resistor?
Options- A. yes
- B. no Discuss
- 8. What does the discharge transistor do in the 555 timer circuit?
Options- A. charge the external capacitor to stop the timing
- B. charge the external capacitor to start the timing over again
- C. discharge the external capacitor to stop the timing
- D. discharge the external capacitor to start the timing over again Discuss
- 9. What controls the output pulse width of a one shot?
Options- A. the clock frequency
- B. the width of the clock pulse
- C. an RL time constant
- D. an RC time constant Discuss
- 10. The internal circuitry of the 555 timer consists of ________, an R-S flip-flop, a transistor switch, an output buffer amplifier, and a voltage divider.
Options- A. a comparator
- B. a voltage amplifier
- C. two comparators
- D. a peak detector Discuss
Multivibrators and 555 Timer problems
Search Results
Correct Answer: 0.501 ms
Correct Answer: monostable
Correct Answer: to compare the input voltages to the internal voltage divider
Correct Answer: duty cycle
Correct Answer: the period of the waveform
Correct Answer: it requires a trigger to obtain an output signal
Correct Answer: no
Correct Answer: discharge the external capacitor to start the timing over again
Correct Answer: an RC time constant
Correct Answer: two comparators
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