Exercise: Multivibrators And 555 Timer

Questions for: Multivibrators And 555 Timer

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?
A:
the shape of the waveform
B:
the amplitude of the waveform
C:
the period of the waveform
D:
none of the above
Answer: C
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If Vcc of a 555 timer circuit is set to +10 V what is the level of output voltage from the circuit?
A:
VOH = 10 V, VOL = 0 V
B:
VOH = 10 V, VOL = 0.1 V
C:
VOH = 8.5 V, VOL = 0 V
D:
VOH = 8.5 V, VOL = 0.1 V
Answer: D
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The pulse width out of a one-shot multivibrator increases when the:
A:
supply voltage increases
B:
timing resistor decreases
C:
UTP decreases
D:
timing capacitance increases
Answer: A
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What is the output pulse width of the waveform at the output of the circuit in the given figure?

A:
1.65 ms
B:
18.2 ms
C:
4.98 ms
D:
54.6 ms
Answer: B
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Which of the following is NOT a characteristic of a retriggerable monostable multivibrator?
A:
It is a dual multivibrator.
B:
It has an active-HIGH reset, which terminates all timing functions.
C:
It has no internal timing resistor.
D:
none of the above
Answer: B
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