🔍 Key Concepts

• Review how an on-delay timer behaves when the input is energized and de‑energized. • Compare that with an off-delay timer, which starts timing when the input goes low. • Think about what a pulse timer does with a short input signal and when its output turns on and off relative to the preset time (PT).

💭 Think About

• In figure C, when does the timer output actually turn ON – while the input is present, after it turns OFF, or both? • How long does the output stay ON compared to the length of the input signal and the preset time PT? • Does the output remain energized after the timing period, or does it just create a brief pulse? What timer type is designed for that behavior?

✅ Before You Answer

• Check whether the timing ramp (elapsed time line) starts when the input goes high or when it goes low. • Verify if the output is ON during the timing ramp or only at the end of the preset time PT. • Confirm whether the diagram shows a momentary output pulse or a sustained output; match that to the timer type name in the choices.