# Digital Electronics - Multivibrators and 555 Timer

### Exercise :: Multivibrators and 555 Timer - General Questions

21.

What is the difference between a retriggerable one shot and a nonretriggerable one shot?

 A. The nonretriggerable can only be triggered once. B. The retriggerable can be triggered many times. C. The output pulse can be stretched with a nonretriggerable. D. The output pulse can be stretched with a retriggerable.

Explanation:

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22.

Triggering a retriggerable one shot during pulse generation will:

 A. time out the original pulse B. extend the pulse to this trigger width C. have no effect D. double the original pulse width

Explanation:

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23.

What is the duty cycle of the waveform at the output of the circuit given below?

 A. 78% B. 56% C. 50% D. 44%

Explanation:

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24.

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

Explanation:

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25.

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