For the programmed timer circuit shown, the pilot light should come on:
A)as soon as the switch is closed.
B)before the switch is closed.
C)for 15 seconds after the switch is opened.
D)as soon as the switch is closed and for 15 seconds after the switch is opened.

Question

For the programmed timer circuit shown, the pilot light should come on: 
A)as soon as the switch is closed. 
B)before the switch is closed. 
C)for 15 seconds after the switch is opened. 
D)as soon as the switch is closed and for 15 seconds after the switch is opened.

Quizplus · Accepted Answer

The circuit consists of a normally open switch (S1), a timer (IC1), a relay (K1), and a pilot light (PL1). When the switch is closed, power is supplied to the timer and it starts counting down. After the 1st timing cycle, the relay is energized and the pilot light is turned on. When the switch is opened, the timer is reset and continues to run for another 15 seconds. During this time, the relay remains energized and the pilot light stays on. Therefore, the pilot light comes on as soon as the switch is closed and remains on for 15 seconds after the switch is opened.

For the Programmed Timer Circuit Shown, the Pilot Light Should