Digital Electronics - Multivibrators and 555 Timer

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You can easily solve all kind of Digital Electronics questions based on Multivibrators and 555 Timer by practicing the objective type exercises given below, also get shortcut methods to solve Digital Electronics Multivibrators and 555 Timer problems.

Exercise :: Multivibrators and 555 Timer - General Questions

1. 

What is the function of the comparators in the 555 timer circuit?

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

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

2. 

When a capacitor charges:

A. the voltage across the plates rises exponentially
B. the circuit current falls exponentially
C. the capacitor charges to the source voltage in 5×RC seconds
D. all of the above

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

3. 

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: Option C

Explanation:

No answer description available for this question. Let us discuss.

4. 

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: Option B

Explanation:

No answer description available for this question. Let us discuss.

5. 

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: Option D

Explanation:

No answer description available for this question. Let us discuss.

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