# Digital Electronics - Multivibrators and 555 Timer

## Why Digital Electronics Multivibrators and 555 Timer?

In this section you can learn and practice Digital Electronics Questions based on "Multivibrators and 555 Timer" and improve your skills in order to face the interview, competitive examination and various entrance test (CAT, GATE, GRE, MAT, Bank Exam, Railway Exam etc.) with full confidence.

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## Where can I get Digital Electronics Multivibrators and 555 Timer Interview Questions and Answers (objective type, multiple choice)?

Here you can find objective type Digital Electronics Multivibrators and 555 Timer questions and answers for interview and entrance examination. Multiple choice and true or false type questions are also provided.

## How to solve Digital Electronics Multivibrators and 555 Timer problems?

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

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

Explanation:

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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

Explanation:

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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

Explanation:

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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

Explanation:

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