Previous Year Question

Correct Answer

B — a resistor and capacitor

Concept and Reasoning

For a nonretriggerable one-shot, once triggered the output pulse lasts for the timing interval determined by its external timing components. Additional triggers arriving during that interval do not restart or extend the pulse. Therefore the pulse-width dependence specified by option B is correct.

Calculation / Key Relation

Typical one-shot width T≈kRC (device dependent)

Exam Takeaway

Nonretriggerable: new trigger during the pulse is ignored.

Common Mistake

Do not confuse pulse width with trigger repetition period.