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.

Answer: Option D

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

Answer: Option B

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%

Answer: Option B

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

Answer: Option B

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

Answer: Option D

Explanation:

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