Exercise: Multivibrators And 555 Timer

Questions for: Multivibrators And 555 Timer

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.
A:
a comparator
B:
a voltage amplifier
C:
two comparators
D:
a peak detector
Answer: C
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Pulse stretching, time-delay, and pulse generation are all easily accomplished with which type of multivibrator circuit?
A:
astable
B:
monostable
C:
multistable
D:
bistable
Answer: B
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What does the discharge transistor do in the 555 timer circuit?
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
Answer: D
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A 22-k resistor and a 0.02-F capacitor are connected in series to a 5-V source. How long will it take the capacitor to charge to 3.4 V?
A:
0.44 ms
B:
0.501 ms
C:
0.66 ms
D:
0.70 ms
Answer: B
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The ________ is defined as the time the output is active divided by the total period of the output signal.
A:
on time
B:
off time
C:
duty cycle
D:
active ratio
Answer: C
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