Exercise: Multivibrators And 555 Timer

Questions for: Multivibrators And 555 Timer

To obtain a 50% duty cycle in an astable 555 timer circuit:
A:
tLO = tHI
B:
RA = RB and short RB with a diode during the capacitor charging cycle
C:
capacitor voltage must rise above 1/3 VCC
D:
tLO = tHI, RA = RB, and short RB with a diode during the capacitor charging cycle
Answer: A
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What is the pulse width of the output of a 74123 if an external 4.7-k resistor and a 0.022-F capacitor are used?
A:
290 ms
B:
29 ms
C:
33.3 s
D:
290 s
Answer: C
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A retriggerable one shot has a pulse of 10 ms. 3 ms after being triggered, another trigger pulse is applied. The resulting output pulse will be ________ ms.
A:
3
B:
7
C:
10
D:
13
Answer: D
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The monostable multivibrator circuit is not an oscillator because ________.
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
Answer: B
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What is the duty cycle of the waveform at the output of the circuit given below?

A:
78%
B:
56%
C:
50%
D:
44%
Answer: B
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